CN210005240U - kinds of pilot operated safety valve on-line checking system - Google Patents
kinds of pilot operated safety valve on-line checking system Download PDFInfo
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- CN210005240U CN210005240U CN201920939041.5U CN201920939041U CN210005240U CN 210005240 U CN210005240 U CN 210005240U CN 201920939041 U CN201920939041 U CN 201920939041U CN 210005240 U CN210005240 U CN 210005240U
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Abstract
The utility model discloses an kind of pilot operated safety valve on-line verification system for carrying out the pressure online check of setting of pilot operated safety valve and main valve for the pilot operated safety valve on inflammable and explosive, low temperature low pressure storage tank, be equipped with the fourth control valve on the pressure-conducting pipe between the pilot operated safety valve's the pilot operated safety valve and the main valve, loop through the balance cylinder of pipe connection, be used for through the gaseous pressure-measuring pipe that rises to the pilot operated safety valve of packing into in the liquid compression balance cylinder working pressure to the pilot operated opening, control valve and be used for the liquid infusion ware of storage liquid to and set up the test pressure record appearance that is used for the interior liquid level altitude variation of real-time recording pressure-measuring pipe on the pressure-measuring pipe, wherein, the fourth control valve passes through pipe connection with the balance cylinder for the switch-on of control pilot operated safety valve and balance cylinder, the pressure-measuring pipe constitutes U type structure with the balance cylinder.
Description
Technical Field
The utility model relates to a relief valve calibration technical field especially relates to kinds of guide's formula relief valve online calibration system.
Background
At present, the energy consumption structure of China is changing from fuel taking coal fossil as the leading fuel to natural gas taking clean energy as the main, and a large number of natural gas storage stations are built in Shenzhen region, in order to improve the high efficiency of natural gas (methane) in the transportation and storage processes, the main international technology is to cool the natural gas and store the natural gas at low temperature (-190 ℃), in the storage process, due to the reason of heat insulation efficiency, a storage tank storing low-temperature natural gas may absorb heat and cause the pressure in the storage tank to rise accidentally, in order to ensure safety, a tank top (gas phase space) of a low-temperature liquefied natural gas storage tank requires a safety valve to be installed, the type of the safety valve is a pilot operated safety valve, and the working and technical characteristics of the safety valve are as follows:
1. the diameter is large, the discharge capacity is large, the volume is large, the weight is large, 300 Kg-500 Kg;
2. the structure form mostly adopts a pilot operated safety valve;
3. the working environment is inflammable and explosive, and the working area strictly prohibits live working and sparks;
4. the relief valve operating pressure is low, takes a certain gas station storage tank of Shenzhen as an example, specifically is: 0.028 MPa;
according to the related national safety technical requirements, the safety valve needs to be checked times every year, the conventional checking method is to remove a pilot operated safety valve with a main valve of 1 meter wide and 2-3 meters long and a main valve of 300 Kg-500 Kg from the top of a storage tank with the height of dozens of meters for off-line checking, so that time and labor are wasted, and the safety work is difficult to determine , users in a natural gas station apply for on-line checking of the pilot operated safety valve for many times, but the traditional on-line checking method cannot meet the checking requirements of the pilot operated safety valve, so the on-line working of the low-temperature liquefied natural gas pilot operated safety valve cannot be carried out, and the specific reasons are as follows:
1. the pilot operated safety valve has low working pressure, taking a storage tank of a certain gas station of Shenzhen as an example, specifically, the pressure is 0.028MPa, the selectivity of matching a pressure gauge for conventional verification is smaller, the production range of the national pressure gauge is 0-0.06MPa of a single-coil spring tube pressure gauge and-0.1-0.06 MPa of a vacuum pressure gauge, 1/3-2/3 with the range of the pressure gauge is detected according to the using range of the pressure gauge, namely, 0.02MPa-0.04MPa, and the requirement of measurement precision can not be met when the range is exceeded.
2. Because the operating environment of the pilot operated safety valve is inflammable and explosive, and the working area strictly prohibits live working and spark, the live working can not be carried out on the working site. Thus, such a pressure measurement method that requires electricity while the accuracy of the pressure sensor is high cannot be employed. Therefore, the traditional safety valve online calibrator cannot meet the measurement requirement;
3. liquefied natural gas is a flammable and explosive medium and cannot be in contact with air in the online verification process, so that dangers are prevented from occurring in the online verification process. Therefore, the verification medium cannot be air or a gaseous medium with oxidizing chemistry;
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, it is bulky to leading formula relief valve among the prior art, demolish the off-line check-up and waste time and energy, leading formula relief valve operating pressure is low, traditional manometer can't measure, leading formula relief valve operational environment is inflammable and explosive, the pressure sensor that needs the power consumption can't use, and liquefied natural gas is inflammable and explosive medium, the check-up medium can not adopt the defect of the gaseous medium who has oxidation chemistry nature, kinds of leading formula relief valve on-line check-up systems are provided.
The utility model provides a technical scheme that its technical problem adopted is that construct kinds of pilot operated relief valve on-line check-up systems for inflammable and explosive, the pilot operated relief valve on the low temperature low pressure storage tank carries out the online check-up of setting pressure of pilot valve and main valve, include:
the device comprises a pilot valve, a pilot tube, a pressure measuring tube, an control valve, a liquid replenishing device and a test pressure recorder, wherein the pilot tube is connected with the balance tube in sequence through a guide tube;
the fourth control valve is connected with the balancing cylinder through a guide pipe and used for controlling the conduction of the pilot valve and the balancing cylinder and controlling the disconnection between the main valve and the balancing cylinder and between the main valve and the pilot valve; the pressure measuring pipe and the balance cylinder form a U-shaped structure.
Preferably, in the online calibration system for the pilot operated safety valve of the present invention, the liquid in the pressure measuring tube and the liquid infusion device is water or saturated salt solution;
the fourth control valve is a three-way control valve.
Preferably, in the online calibration system for the pilot operated safety valve of the present invention, the volume of the balance cylinder is greater than the water injection amount of the fluid infusion device injected into the pressure measuring tube;
the bottom of the pressure measuring pipe is connected with the bottom of the balance cylinder through a guide pipe to form a U-shaped structure, and the fourth control valve is connected with the top of the balance cylinder through a guide pipe.
Preferably, in the online calibration system for pilot operated safety valve of the present invention, the test pressure recorder includes: the device comprises a floating ball, a connecting rod, a recording pen and a recording plate, wherein the floating ball, the connecting rod and the recording pen are sequentially connected, and the recording plate is arranged corresponding to the recording pen;
the floating ball is placed on the liquid level of the piezometer tube and used for floating up and down along with the liquid level in the piezometer tube, the recording plate moves slowly along the horizontal direction, the floating ball drives the recording plate to record the change of the liquid level height in the piezometer tube through the connecting rod, and the setting pressure of the pilot valve is calculated through the recorded liquid level height change.
The utility model discloses an kinds of leading formula relief valve online check-up system has been constructed for the leading formula relief valve that is inflammable and explosive, on the low temperature low pressure storage tank carries out the online check-up of linkage of pilot valve and main valve, include:
the device comprises a pilot-operated safety valve, a pressure guide pipe, a third control valve, a bottle body, a U-shaped main valve opening tester and a liquid level change judging device, wherein the pressure guide pipe is arranged between a pilot valve and a main valve of the pilot-operated safety valve;
the fourth control valve is connected with the third control valve through a guide pipe and is used for controlling the mutual conduction among the pilot valve, the main valve and the guide pipe.
Preferably, in the online calibration system for the pilot operated safety valve of the present invention, the bottle body filled with the inert gas is a nitrogen bottle;
the liquid in the main valve opening tester is water or saturated salt water;
the fourth control valve is a three-way control valve;
the U-shaped main valve opening tester is a U-shaped pipe.
The utility model discloses kinds of leading formula relief valve online check-up systems have still been constructed for the leading formula relief valve that is inflammable and explosive, on the low temperature low pressure storage tank carries out the online check-up of the linkage of setting pressure of pilot valve and main valve, include:
the device comprises a pilot valve, a pilot safety valve, a pressure measuring pipe, an control valve, a liquid supplementing device and a test pressure recorder, wherein the pilot valve is arranged on a pilot pipe of the pilot safety valve;
the fourth control valve is connected with the second control valve through a conduit, and a third control valve connected with the second control valve through a conduit and a bottle body used for integrally boosting the pilot operated safety valve through inputting inert gas filled in the bottle body are arranged between the fourth control valve and the second control valve;
the end is connected with the discharge port of the main valve and is used for judging whether the main valve is linked to open or not when the pilot valve is opened through liquid level change;
the pressure measuring pipe and the balance cylinder form a U-shaped structure;
the fourth control valve is used for controlling the conduction between the balance cylinder and the second control valve and controlling the disconnection between the main valve and the balance cylinder and the pilot valve when the setting pressure of the pilot valve and the main valve is verified on line; the device is used for controlling the mutual conduction of the pilot valve, the main valve and the guide pipe thereof when linkage on-line verification of the pilot valve and the main valve is carried out;
the second control valve is used for controlling the conduction between the pilot valve and the balance cylinder when the setting pressure of the pilot valve and the main valve is verified on line; the balance cylinder is used for closing the conduction of the balance cylinder and the pilot safety valve when linkage on-line verification of the pilot valve and the main valve is carried out;
the third control valve is used for closing the conduction between the bottle body and the pilot type safety valve when the set pressure of the pilot valve and the main valve is checked on line; and the on-line checking device is used for controlling the conduction of the bottle body and the pilot safety valve when the linkage of the pilot valve and the main valve is checked on line.
Preferably, in the online calibration system for a pilot operated safety valve of the present invention, the liquid in the pressure measuring tube, the liquid infusion device and the main valve opening tester is water or saturated salt solution;
the fourth control valve is a three-way control valve;
the volume of the balance cylinder is larger than the water injection amount of the liquid infusion device injected into the piezometric tube.
Preferably, in the online calibration system for pilot operated safety valve of the present invention, the test pressure recorder includes: the device comprises a floating ball, a connecting rod, a recording pen and a recording plate, wherein the floating ball, the connecting rod and the recording pen are sequentially connected, and the recording plate is arranged corresponding to the recording pen;
the floating ball is placed on the liquid level of the piezometer tube and used for floating up and down along with the liquid level in the piezometer tube, the recording plate moves slowly along the horizontal direction, the floating ball drives the recording pen to record the change of the liquid level height in the piezometer tube on the recording plate through the connecting rod, and the setting pressure of the pilot valve is calculated through the recorded liquid level height change.
Preferably, in the online calibration system for the pilot operated safety valve of the present invention, the bottle body filled with the inert gas is a nitrogen bottle;
the U-shaped main valve opening tester is a U-shaped pipe.
Through implementing the utility model discloses an online check-up system of guide's formula relief valve has following beneficial effect:
because the pilot operated safety valve is installed on the tank top, the liquefied natural gas storage tank volume reaches several tens of thousands of cubes, the height of the geometric dimension reaches several tens of meters, and the pilot operated safety valve is large in size and weight, the utility model discloses the online check-up system of pilot operated safety valve that sets up can check-up on the spot, need not to demolish the pilot operated safety valve and carry out the off-line check-up, has improved the convenience of check-up;
because the setting pressure of the pilot operated safety valve is lower, the precision and the measuring range of the traditional pressure gauge can not meet the requirements, the height of the liquid level column is recorded by a test pressure recorder instead, and the conversion of the pressure is carried out, so that the traceability is realized, the precision of the small pressure measurement is ensured, and the defect that the field can not be detected in a charged way is overcome;
because the operating environment of the pilot operated safety valve is inflammable and explosive, and the working area strictly prohibits live working and spark, the working site can not carry out live working, and the online checking system of the pilot operated safety valve of the utility model can work without a power supply;
because the air medium cannot be adopted in the online checking process, the medium in the safety valve cannot be contacted with the air medium in the whole checking process; meanwhile, in order to prevent the liquefied natural gas from being polluted, the safety valve system cannot be contacted with liquid, so the utility model discloses a set up the balance cylinder, the liquid level in the balance cylinder can not break through the balance cylinder, ensure that the liquid can not flow between pilot valve and its connecting pipeline in the process of carrying out the online check of setting pressure of pilot valve, and then polluted liquefied natural gas, ensured the quality of liquefied natural gas; the safety of the linkage on-line calibration process of the pilot valve and the main valve is ensured by arranging the nitrogen cylinder;
by adopting the on-line checking system of the pilot operated safety valve, the main valve can be opened in a linkage manner after the pilot valve is opened by effectively judging the liquid level difference of the main valve opening tester by adopting the communicating vessel balance principle;
in addition, saturated salt solution is used as gas for compressing the gas between the pilot valves, so that the pressure of the pilot valves is increased, the pressure of the pilot valves is slowly increased, and the accuracy of the set pressure reading of the pilot valves is ensured.
Drawings
The present invention will be described with reference to the accompanying drawings and examples in which steps are performed:
FIG. 1 is a schematic diagram of an on-line verification system for pilot operated safety valve for on-line verification of set pressure of pilot valve and main valve according to an embodiment of the present invention at ;
fig. 2 is a schematic diagram of an online calibration system for a pilot operated safety valve for online calibration of linkage between a pilot valve and a main valve according to a second embodiment of the present invention;
fig. 3 is a schematic diagram of a pilot operated safety valve online verification system for performing online verification of set pressure of a pilot valve and a main valve and online verification of linkage of the pilot valve and the main valve according to a third embodiment of the present invention;
fig. 4 is a schematic diagram of a curve recorded by the test pressure recorder of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1. Because the pilot operated relief valve is installed on the tank top, the volume of the liquefied natural gas storage tank reaches several tens of thousands of cubes, the height of the geometric dimension reaches dozens of meters, for the convenience of on-site verification, the on-line calibrator is required to be light and convenient, the equipment height does not exceed 4 meters, the effective height is 3 meters, the diameter is reasonable, and the on-site carrying and operation are convenient;
2. because the setting pressure of the pilot operated safety valve is low, the precision and the measuring range of the traditional pressure gauge cannot meet the requirements, a reasonable pressure measuring device is adopted, and the device can stably and accurately read data.
3. The power can not be supplied to the inspection site, so that the online calibrator can work without a power supply;
4. an air medium cannot be adopted in the online checking process, and the medium in the safety valve cannot be in contact with the air medium in the whole checking process; meanwhile, in order to prevent the liquefied natural gas from being polluted, the safety valve system cannot be in contact with the liquid;
5. after the pilot valve is judged to be opened by adopting an effective method, the main valve can also be opened;
6. test data can be recorded in real time;
consequently to the forerunner's formula relief valve on above-mentioned inflammable and explosive, low temperature low pressure storage tank 11, the utility model discloses kinds of forerunner's formula relief valve online check-up systems have been constructed for the forerunner's formula relief valve that inflammable and explosive, low temperature low pressure storage tank 11 go on carrying out the pilot valve sets pressure online check-up, see fig. 1, fig. 1 is the utility model discloses carry out the schematic diagram of the forerunner's formula relief valve online check-up system of setting pressure online check-up of pilot valve and main valve in the embodiment of , include:
the pressure-measuring valve comprises a pilot valve 14, a main valve 15, a balance cylinder 21, a pressure-measuring pipe 22, an -th control valve 23 and a liquid replenishing device 24, wherein the pilot valve 14 and the main valve 15 are arranged on a pressure-measuring pipe between the pilot valve 13 and the main valve 15 of the pilot operated safety valve;
wherein, the fourth control valve 13 is connected with the balancing cylinder 21 through a conduit, and is used for controlling the conduction of the pilot valve 14 and the balancing cylinder 21 and the disconnection between the main valve 15 and the balancing cylinder 21 and the pilot valve 14; the pressure measuring pipe 22 and the balance cylinder 21 form a U-shaped structure.
Specifically, the fourth control valve 13 is provided on a pilot pipe between the pilot valve 14 and the main valve 15 of the pilot type relief valve, and is preferably a three-way control valve for controlling conduction or disconnection between the pilot valve 14, the main valve 15, and the balance cylinder 21. When the set pressure of the pilot valve is verified on line, the three-way control valve controls the conduction of the pilot valve 14 only with the balance barrel 21, and controls the disconnection between the main valve 15 and the pilot valve 14 and the balance barrel 21.
For the balance cylinder 21, because the low-temperature liquefied natural gas is most vulnerable to water pollution, in order to prevent water pollution during a test, the balance cylinder 21 is provided, the volume of the balance cylinder 21 is larger than the water injection amount of the liquid supplement device 24 injected into the pressure measuring tube 22, or the change of the liquid volume in the pressure measuring tube 22 is smaller than the volume of the balance cylinder 21, so as to ensure that water does not flow between the pilot valve and a connecting pipeline thereof during the test, the liquid supplement device 24 injects liquid into the pressure measuring tube 22, the liquid level in the pressure measuring tube 22 rises, the liquid flows into the balance cylinder 21, gas in the balance cylinder 21 is compressed, the working pressure of the pilot operated safety valve is raised until the pilot valve 14 is opened, the liquid level is controlled below the upper boundary of the balance cylinder 21, and the liquid level cannot break through the balance. The balance cylinder 21 may be made of a transparent material such as perspex for easy viewing, and the volume of the balance cylinder is large to ensure that the gas in the volume of the balance cylinder 21 provides sufficient gas to raise the pilot valve pressure during the compression of the pilot valve gas.
As for the pressure measuring pipe 22, the liquid in the pressure measuring pipe 22 is water or saturated salt solution, the pressure measuring pipe 22 and the balance cylinder 21 form a U-shaped structural form, the bottom of the pressure measuring pipe 22 is connected with the bottom of the balance cylinder 21 through a guide pipe, and the top of the balance cylinder 21 is connected with the fourth control valve 14 through a guide pipe, as shown in the figure, the pressure measuring pipe 22 consists of cylindrical containers with fixed diameters, the height is controlled within 3 meters, the height is mainly convenient to carry and operate, in addition, according to the measuring principle of the U-shaped pressure measuring pipe, the size of the measuring principle is mainly the static pressure generated by the liquid in the pressure measuring U-shaped pipe, and the calculation formula is that P is equal to rho h, rho is the liquid density, and the unit is kg/m3The Ag is the acceleration of gravity in N/kg, and h is the height of the liquid column in m.
If the height of the differential pressure generated by the injected water is 4 meters, the generated pressure is 0.04MPa (gauge pressure), if the working pressure of the pilot operated safety valve is 0.028MPa (gauge pressure), then a differential pressure water column of 2.8 meters is needed on both sides of the U-shaped pipe, and if the measuring range is increased, saturated saline can be used as the calibration medium, because the density of the saturated saline is fixed at , the constant density of the calibration medium can be easily obtained on the calibration site, if the normal temperature is adopted, the density of the saturated saline is 1.33g/cm3, and the density of the water is 1.0g/cm3, therefore, the pressure generated by the saturated saline is higher under the same liquid height, and the liquid level height can be lower under the same pressure, therefore, the on-line calibration of the pressure greater than 0.028MPa (gauge pressure) can be realized by using the saturated saline or the medium with higher density and stable density as the calibration medium pressure pipe, namely, the liquid level height of the pressure of the measuring valve 22 is determined by the pressure of the pilot operated safety valve and the open pressure of the pilot operated safety valve.
For the th control valve 23, when the online verification of the pilot valve set pressure is carried out, in the process of increasing the working pressure of the pilot operated safety valve, the th control valve 23 is opened, the liquid supplementing device 24 is controlled to inject liquid into the pressure measuring pipe 22 until the pilot valve 14 is opened, and the liquid in the liquid supplementing device 24 is water or saturated salt water and corresponds to the liquid in the pressure measuring pipe 22.
The test pressure recorder comprises a floating ball 25, a connecting rod 26, a recording pen 27 and a recording board 28 which is arranged corresponding to the recording pen 27 and forms sets of devices, wherein the floating ball 25 is placed on the liquid level of the pressure measuring pipe 22 and used for floating up and down along with the liquid level in the pressure measuring pipe 22, the recording board 28 moves slowly along the horizontal direction, and the floating ball 25 drives the recording pen 27 to record the change of the liquid level height in the pressure measuring pipe 22 on the recording board 28 through the connecting rod 26. the specific working principle is as follows:
during the safety valve test, the level of liquid in the pressure sensing tube 22 will vary as the pressure within the valve changes, in short, high when the pressure is high and low when the pressure is low.
The specific operation method of the test pressure recorder comprises the following steps: at the beginning of the test, the pressure measuring tube 22 was filled with a liquid and left to stand after stabilizationThe float 25 is loaded quantitatively, the fourth control valve 13 is opened, the liquid in the pressure measuring tube 22 assumes a height of due to the action of the air pressure, at which time the recording plate 28 starts to move slowly in the horizontal direction, i.e. in the x-axis direction of the graph, since the operating pressure of the pilot operated safety valve is lower than the set pressure of the pilot operated safety valve, in order to increase the operating pressure of the pilot operated safety valve, we input the liquid into the pressure measuring tube 22 through the liquid replenishing device 24, so that as the liquid level increases, the operating pressure of the pilot operated safety valve also increases, the liquid level in the pressure measuring tube 22 also increases, the float 25 with the connecting rod 26 and the recording pen 27 on the recording plate 28 by the action of the recording pen 27, draws a curve of the increase in the operating pressure of the pilot operated safety valve, the pilot operated 14 is opened when the operating pressure of the pilot operated safety valve reaches the set pressure, the curve recorded on the recording plate 28 reaches the highest point, the gas is discharged after the pilot operated 14 is opened, the pressure in the pressure measuring tube 22 is stopped, the pressure of the pressure measuring tube 22 is reduced, the recording plate 22, the recording pressure of the liquid level P is calculated by the recording pen 14, the recording graph, the recording the liquid level P is recorded as a graph, the measured by the liquid level P, the graph, the liquid level P, the recording pressure of the recording pen 26 is recorded3The Ag is the acceleration of gravity in N/kg, and h is the height of the liquid column in m.
As shown, the X-axis represents time and the Y-axis represents the corresponding level height, which can be converted to pressure or force, respectively. The point b represents the liquid level corresponding to the initial working pressure of the pilot operated safety valve, the point a represents that the working pressure of the pilot operated safety valve reaches the setting pressure after the pressure measuring pipe 22 injects liquid, and the point c represents that the pilot valve reaches the recoil pressure.
During conversion, the point a represents that the working pressure of the pilot operated safety valve reaches the set pressure, and the height difference a is measured1The point b represents the liquid level height corresponding to the initial working pressure of the pilot operated safety valve, plus the height difference a1The highly converted pressure or pressure being that of the pilot operated safety valveSetting pressure; similarly, the point c represents that the pilot valve reaches the recoil pressure, and the recoil pressure is the liquid level height minus a corresponding to the setting pressure point a2The liquid level of (a), the pressure or pressure converted in correspondence with this height.
Based on the pilot operated safety valve on-line verification system for performing on-line verification on the set pressure of the pilot operated safety valve and the main valve for the pilot operated safety valve on the storage tank, kinds of pilot operated safety valve on-line verification methods are also constructed for performing on-line verification on the set pressure of the pilot operated safety valve and the main valve for the pilot operated safety valve on the inflammable and explosive low-temperature low-pressure storage tank 11, and the method is characterized by comprising the following steps of:
s11, before checking, closing a valve , a fourth control valve 13 and a control valve 23 between the pilot operated safety valve and the storage tank 11, filling liquid into the pressure measuring pipe 22, wherein the liquid in the pressure measuring pipe 22 flows into the balance cylinder 21 due to the atmospheric pressure, the liquid level of the balance cylinder 21 is controlled at the bottom boundary of the balance cylinder 21, or the liquid in the pressure measuring pipe 22 does not flow into the balance cylinder 21 due to the sufficient atmospheric pressure in the balance cylinder 21;
s12, during verification, the fourth control valve 13 is opened, the conduction between the balance cylinder 21 and the pilot valve 14 is controlled, and the disconnection between the main valve 15 and the balance cylinder 21 and the pilot valve 14 is controlled; the pressure measuring pipe 22 displays the liquid level according to the working pressure of the pilot operated safety valve;
s13, opening a control valve 23, controlling a liquid supplementing device 24 to inject liquid into the pressure measuring tube 22, compressing gas in the balancing cylinder 21, increasing the working pressure of a pilot operated safety valve until a pilot valve 14 is opened, wherein the injection amount of water injected into the pressure measuring tube 22 by the liquid supplementing device 24 is less than the volume of the balancing cylinder 21;
s14, discharging gas after the pilot valve 14 is opened, closing the control valve 23, controlling the liquid supplementing device 24 to stop injecting liquid into the pressure measuring pipe 22, and reducing the working pressure of the pilot safety valve until the pilot valve 14 is closed;
and S15, in the checking process, recording the change of the liquid level height in the piezometer tube 22 in real time through the test pressure recorder, and calculating the setting pressure when the pilot valve 14 is opened. Specifically, the setting pressure when the pilot valve 14 is opened is calculated according to a formula,wherein the formula is: p rho represents the liquid density in kg/m3The Ag is the acceleration of gravity in N/kg, and h is the height of the liquid column in m.
Referring to fig. 2, fig. 2 is the utility model discloses the second embodiment carries out the online check-up system's of leading formula relief valve of pilot valve and main valve linkage online check-up schematic diagram, the utility model discloses kinds of leading formula relief valve online check-up systems have been constructed for flammable and explosive, the online check-up of linkage that the leading formula relief valve on the low temperature low pressure storage tank 11 carried out pilot valve and main valve, include:
a fourth control valve 13 is arranged on a pressure guide pipe between a pilot valve 14 and a main valve 15 of the pilot operated safety valve, a third control valve 32 connected in sequence through a guide pipe, a bottle body 31 used for carrying out integral pressure boosting on the pilot operated safety valve through inputting inert gas filled in, and a U-shaped main valve opening tester 34, wherein the end of the U-shaped main valve opening tester is connected with a main valve discharge port and is used for judging whether the main valve 15 is opened in linkage through liquid level change when the pilot valve 14 is opened;
wherein the fourth control valve 13 is connected with the third control valve 32 through a conduit for controlling the mutual conduction between the pilot valve 14, the main valve 15 and the conduits thereof.
Specifically, the fourth control valve 13 is provided on a pilot pipe between the pilot valve 14 and the main valve 15 of the pilot type relief valve, and is preferably a three-way control valve for controlling conduction or disconnection between the pilot valve 14, the main valve 15, and the balance cylinder 21. When the linkage of the pilot valve and the main valve is checked on line, the three-way control valve controls the mutual conduction among the pilot valve, the main valve 15 and the guide pipe thereof.
In the present embodiment, the bottle 31 filled with inert gas is preferably a nitrogen gas bottle, and in other embodiments, other inert gas bottles can be selected, which will be described in detail herein, since the whole system is connected to , the main valve and the system thereof have larger gaseous space, so that the method of compressing the space by liquid is not suitable, and therefore, the whole pressure boosting process of the pilot operated safety valve is completed by supplementing nitrogen gas by the nitrogen gas bottle, because nitrogen gas is inert gas, and the safety requirement of the verification process is met.
For the main valve opening tester 34, the set pressure of the main valve is extremely low, as low as 0.028MPa (gauge pressure). The low setting pressure causes great error and large artificial influence factor because the safety valve has too low pressure and small air flow after opening and whether the safety valve is opened or not is judged according to the traditional sound.
For this purpose, we adopt the principle of communicating vessel balance, and install a main valve opening tester on the discharge side of the main valve. After the tester is installed, water or saturated brine is injected. When the main valve is not opened, the liquid levels on the two sides of the tester are equal. After the master valve opens, the level on the right side of the master valve opening tester 34 is higher than the level on the left side. Thus, the main valve is shown open. For example: the opening pressure of the main valve was 0.028MPa (gauge pressure), so that the difference between the liquid levels on the left and right sides of the tester was 2.8 meters of water column. Certainly, the height of the right side of the U-shaped pipe tester is not 2.8 meters enough, and redundant water can be sprayed out without affecting the observation. As long as the difference between the on-site liquid levels on the two sides of the U-shaped pipe tester proves that the main valve discharge port has pressure, and the main valve is opened, the opening of the main valve is judged by the method. And preferably the U-shaped main valve opening tester 34 is a U-shaped pipe.
Based on the above-mentioned pilot operated safety valve online verification system for performing the linkage online verification of the pilot operated safety valve and the main valve for the pilot operated safety valve on the storage tank 11, kinds of pilot operated safety valve online verification methods are constructed, which are used for performing the linkage online verification of the pilot operated safety valve and the main valve for the pilot operated safety valve on the flammable, explosive and low-temperature low-pressure storage tank 11, and comprise the following steps:
s21, before checking, closing the valve 12, the fourth control valve 13 and the third control valve 32 between the pilot operated safety valve and the storage tank 11, filling liquid into the U-shaped main valve opening tester 34, wherein the liquid level at the two sides is , preferably, the valve 12 is a cut-off ball valve;
s22, during verification, the fourth control valve 13 is opened to control the mutual conduction of the pilot valve 14, the main valve 15 and the guide pipe thereof;
s23, opening the third control valve 32, controlling the bottle 31 to input inert gas to the pilot valve 14 and the main valve 15 to carry out integral pressure boosting of the pilot type safety valve, and boosting the pressure until the pilot valve 14 is opened;
s24, the U-shaped main valve opening tester displays the liquid level change of the U-shaped main valve opening tester 34 according to the opening of the pilot valve 14, and judges whether the main valve 15 is in linkage opening, if the liquid level of the end of the U-shaped main valve opening tester connected with the main valve discharge port is lower than the liquid level of the end, the main valve 15 can be judged to be in linkage opening when the pilot valve 14 starts.
Referring to fig. 3, fig. 3 is a schematic diagram of the pilot operated safety valve on-line checking system for the third embodiment of the present invention, which performs the on-line checking of the setting pressure of the pilot valve and the main valve, and the on-line checking system for the pilot operated safety valve on the storage tank and the on-line checking system for the linkage on-line checking of the pilot valve and the main valve, are combined, the utility model discloses kinds of pilot operated safety valve on-line checking systems are also constructed, which are used for performing the on-line checking of the setting pressure of the pilot valve, the linkage on-line checking of the pilot valve and the main valve for the pilot operated safety valve on the low-temperature:
the pressure-measuring tube is characterized in that a fourth control valve 13 is arranged on the pressure-measuring tube between a pilot valve 14 and a main valve 15 of the pilot operated safety valve, a second control valve 33, a balance cylinder 21, a pressure-measuring tube 22 used for increasing the working pressure of the pilot operated safety valve to open the pilot valve 14 through gas filled in the liquid compression balance cylinder 21, an control valve 23 and a liquid supplementing device 24 used for storing liquid are connected in sequence through the pressure-measuring tube, and a test pressure recorder arranged on the pressure-measuring tube 22 and used for recording the liquid level height change in the pressure-measuring tube 22 in real time;
a third control valve 32 connected between the fourth control valve 13 and the second control valve 33 through a conduit, and a cylinder 31 for integrally pressurizing the pilot operated safety valve by introducing an inert gas;
and a U-shaped main valve opening tester 34, the end of which is connected with the main valve discharge port , and the U-shaped main valve opening tester is used for judging whether the main valve 15 is in linkage opening or not when the pilot valve 14 is opened through liquid level change;
wherein, the pressure measuring pipe 22 and the balance cylinder 21 form a U-shaped structure;
the fourth control valve 13 is used for controlling the conduction between the pilot valve 14 and the second control valve 33 and the disconnection between the main valve 15 and the balance cylinder 21 and the pilot valve 14 when the setting pressure of the pilot valve and the main valve is verified on line; and is used for controlling the mutual conduction of the pilot valve 14, the main valve 15 and the guide pipe thereof when the linkage on-line verification of the pilot valve and the main valve is carried out;
the second control valve 33 is used for controlling the conduction between the pilot valve 14 and the balance cylinder 21 when the setting pressure of the pilot valve and the main valve is verified on line; and is used for closing the conduction of the balance cylinder 21 and the pilot operated safety valve when the linkage on-line check of the pilot valve and the main valve is carried out;
the third control valve is used for closing the conduction between the bottle body 31 and the pilot operated safety valve when the setting pressure of the pilot valve and the main valve is checked on line; and is used for controlling the conduction of the bottle body 31 and the pilot type safety valve when the linkage on-line check of the pilot valve and the main valve is carried out.
Based on the above-mentioned pilot operated safety valve on-line calibration system for the pilot operated safety valve on the storage tank 11 to perform the on-line calibration of the set pressure of the pilot valve and the main valve and the linkage on-line calibration of the pilot valve and the main valve, kinds of pilot operated safety valve on-line calibration methods are constructed, which are used for the on-line calibration of the set pressure of the pilot valve and the main valve and the linkage on-line calibration of the pilot valve and the main valve for the pilot operated safety valve on the flammable and explosive low-temperature low-pressure storage tank 11, and comprise the following steps:
s31, before verification, closing a valve 3612, a fourth control valve 13, a control valve 23, a second control valve 33 and a third control valve 32 between the pilot operated safety valve and the storage tank 11, filling liquid into the pressure measuring tube 22, wherein the liquid in the pressure measuring tube 22 flows into the balance cylinder 21 due to atmospheric pressure, the liquid level of the balance cylinder 21 is controlled at the bottom boundary of the balance cylinder 21, or the liquid in the pressure measuring tube 22 cannot flow into the balance cylinder 21 due to sufficient atmospheric pressure in the balance cylinder 21;
s32, when the online check of the setting pressure of the pilot valve is carried out, the fourth control valve 13 and the second control valve 33 are opened, the conduction between the balance cylinder 21 and the pilot valve 14 is controlled, and the disconnection between the main valve 15 and the balance cylinder 21 and the pilot valve 14 is controlled; the pressure measuring pipe 22 displays the liquid level according to the working pressure of the pilot operated safety valve;
s33, opening a control valve 23, controlling a liquid replenisher 24 to inject liquid into the pressure measuring tube 22, increasing the liquid level in the pressure measuring tube 22, flowing liquid into the balance cylinder 21, compressing gas in the balance cylinder 21, and increasing the working pressure of the pilot operated safety valve to open the pilot valve 14;
s34, discharging gas after the pilot valve 14 is opened, closing the control valve 23, controlling the liquid supplementing device 24 to stop injecting liquid into the pressure measuring pipe 22, and reducing the working pressure of the pilot safety valve until the pilot valve 14 is closed;
s35, in the checking process, recording the change of the liquid level height in the piezometer tube 22 in real time through the test pressure recorder, calculating the setting pressure when the pilot valve 14 is opened, and finishing the on-line checking of the setting pressure of the pilot valve and the main valve;
s36, when the linkage of the pilot valve and the main valve is checked on line, closing the second control valve 33, opening the fourth control valve 13, and controlling the mutual conduction among the pilot valve 14, the main valve 15 and the guide pipe thereof;
s37, opening the third control valve 32, controlling the bottle 31 to input inert gas to the pilot valve 14 and the main valve 15 to carry out integral pressure boosting of the pilot type safety valve, and boosting the pressure until the pilot valve 14 is opened;
s38, the U-shaped main valve opening tester displays the liquid level change of the U-shaped main valve opening tester 34 after the pilot valve 14 is opened, and judges whether the main valve 15 is opened in a linkage mode, if the liquid level of the end, connected with the main valve discharge port, of the U-shaped main valve opening tester is lower than that of the end, the main valve 15 can be judged to be opened in a linkage mode when the pilot valve 14 starts, and linkage on-line verification of the pilot valve and the main valve is completed.
Specifically, the operation process of the online verification system for the pilot operated safety valve is as follows:
1. install online check-up tester, contain: the pressure measuring pipe 22, the nitrogen gas cylinder 31, the floating ball 25, the connecting rod 26, the recording pen 27 and the recording plate 28;
2. injecting a proper amount of saturated saline water into the fluid infusion device 24 and the pressure measuring pipe 22, and simultaneously adjusting the floating ball 25 to enable the floating ball to float freely;
3. opening a debugging three-way control valve 13 to enable a pilot type safety valve pilot valve 14 to be communicated with a tester, the tester is not communicated with a main valve 15, the pilot valve 14 is not communicated with the main valve 15, opening a second control valve 33, communicating a balance barrel 21 with the pilot valve 14, and observing the liquid level condition in the balance barrel 21, wherein constant differential pressure is formed in a pressure measuring pipe under the action of the internal pressure of the pilot type safety valve;
4. in order to increase the pressure of the pilot operated safety valve, the th control valve 23 is opened, along with the injection of saturated saline water into the pressure measuring tube 22 in the fluid infusion device 24, the gas between the pilot valve 14 and the pressure measuring tube 22 is compressed due to the injection of the saturated saline water, and the pressure is increased, the pressure is increased according to the height difference of liquid levels on the left side and the right side of the tester, which is particularly explained here, the liquid level on the right side of the liquid level difference on the two sides in the test process can not be higher than the upper boundary of the balance cylinder, and the injection amount of the water injected into the pressure measuring tube 22;
5. when the pressure rises to to reach the opening pressure of the pilot valve 14, the pilot valve 14 is opened to discharge quantitative gas, the air pressure between the pilot valve 14 and the pressure measuring pipe 22 is reduced, and the pilot type safety valve is back-seated, namely is closed again;
6. in the process of rising-falling of the gas pressure in the pilot valve of the pilot type safety valve, the liquid level height in the piezometer tube 22 will rise and fall; thus, the floating ball 25 will bring the connecting rod 26 and the recording pen 27 to leave a record of ascending and descending on the recording plate 28;
7. the method for recording and converting the set pressure of the pilot operated safety valve by using the left curve comprises the following steps: 1) starting recording in the step 3, horizontally and slowly moving the recording plate 28 along with time, and moving the recording pen 27 up and down along with the height of the liquid level; 2) the whole recording curve is shown in fig. 4, wherein the X axis represents time, and the Y axis represents corresponding liquid level height, which can be converted into pressure or pressure. The liquid level corresponding to the point b represents the working pressure of the pilot operated safety valve, the point a represents that the pilot operated safety valve reaches the setting pressure, and the point c represents that the safety valve reaches the recoil pressure;
in conversion, the generation is due to point aThe meter pilot type safety valve reaches the setting pressure and measures out the height difference a1B, the liquid level height corresponding to the working pressure of the pilot operated safety valve at the point b plus the height difference a1The highly converted pressure or pressure is the setting pressure of the pilot operated safety valve; similarly, the point c represents that the safety valve reaches the reseating pressure, and the reseating pressure is the difference between the corresponding liquid level height of the setting pressure a point and the liquid level height a2The liquid level height of (a), the pressure or pressure converted corresponding to the height;
8. after the test of the set pressure of the pilot valve is finished, the linkage action test of the pilot valve and the main valve is started;
9. installing a main valve opening tester 34, wherein the main valve opening tester also has a U-shaped working principle, and adding liquid after installation, wherein the liquid can be saturated saline water or clear water, and the liquid level heights of two sides after installation are ;
10. the main valve 15 and the connecting system thereof have large volume, so the pressure of the checking system cannot be increased by adopting a method of liquid compression pilot valve gas, and the auxiliary pressure increase must be carried out by adopting a nitrogen bottle 31. Since the opening of the main valve is completely controlled by the pilot valve 14, in the step 7, the measurement of the setting pressure of the pilot valve is already completed, and the following test aims at checking the linkage reliability of the main valve and the pilot valve;
11. closing the second control valve 33, opening the third control valve 32, controlling the boosting speed by utilizing the opening degree of a valve of the third control valve 32, and slowly boosting the whole pilot operated safety valve, when the set pressure of the safety valve is reached, opening the pilot valve again, wherein the set pressure is verified in the step 7, so as to guide the main valve to open;
12. and finishing the detection of the pilot operated safety valve.
Through implementing the utility model discloses an online check-up system of guide's formula relief valve has following beneficial effect:
because the pilot operated safety valve is installed on the tank top, the liquefied natural gas storage tank volume reaches several tens of thousands of cubes, the height of the geometric dimension reaches several tens of meters, and the pilot operated safety valve is large in size and weight, the utility model discloses the online check-up system of pilot operated safety valve that sets up can check-up on the spot, need not to demolish the pilot operated safety valve and carry out the off-line check-up, has improved the convenience of check-up;
because the setting pressure of the pilot operated safety valve is lower, the precision and the measuring range of the traditional pressure gauge can not meet the requirements, the height of the liquid level column is recorded by a test pressure recorder instead, and the conversion of the pressure is carried out, so that the traceability is realized, the precision of the small pressure measurement is ensured, and the defect that the field can not be detected in a charged way is overcome;
because the operating environment of the pilot operated safety valve is inflammable and explosive, and the working area strictly prohibits live working and spark, the working site can not carry out live working, and the online checking system of the pilot operated safety valve of the utility model can work without a power supply;
because the air medium cannot be adopted in the online checking process, the medium in the safety valve cannot be contacted with the air medium in the whole checking process; meanwhile, in order to prevent the liquefied natural gas from being polluted, the safety valve system cannot be contacted with liquid, so the utility model discloses a set up the balance cylinder, the liquid level in the balance cylinder can not break through the balance cylinder, ensure that the liquid can not flow between pilot valve and its connecting pipeline in the process of carrying out the online check of setting pressure of pilot valve, and then polluted liquefied natural gas, ensured the quality of liquefied natural gas; the safety of the linkage on-line calibration process of the pilot valve and the main valve is ensured by arranging the nitrogen cylinder;
by adopting the on-line checking system of the pilot operated safety valve, the main valve can be opened in a linkage manner after the pilot valve is opened by effectively judging the liquid level difference of the main valve opening tester by adopting the communicating vessel balance principle;
in addition, saturated salt solution is used as gas for compressing the gas between the pilot valves, so that the pressure of the pilot valves is increased, the pressure of the pilot valves is slowly increased, and the accuracy of the set pressure reading of the pilot valves is ensured.
It is to be understood that the foregoing examples merely represent preferred embodiments of the present invention, and that the description thereof is more specific and detailed, but not intended to limit the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (10)
- The online calibration system of kinds of pilot operated relief valves is used for carrying out online calibration of setting pressure of a pilot valve and a main valve for the pilot operated relief valve on a flammable and explosive low-temperature low-pressure storage tank (11), and is characterized by comprising the following components:a fourth control valve (13) is arranged on a pressure guide pipe between a pilot valve (14) and a main valve (15) of the pilot operated safety valve, a pressure measuring pipe (22), an th control valve (23) and a liquid supplementing device (24) are sequentially connected through a pressure guide pipe, the pressure measuring pipe (22) is used for compressing the working pressure of the pilot operated safety valve to open the pilot valve (14) through gas filled in the balance cylinder (21), the liquid supplementing device is used for storing liquid, and a test pressure recorder is arranged on the pressure measuring pipe (22) and is used for recording the liquid level height change in the pressure measuring pipe (22) in real time;wherein the fourth control valve (13) is connected with the balancing cylinder (21) through a guide pipe and is used for controlling the conduction of the pilot valve (14) and the balancing cylinder (21) and the disconnection between the main valve (15) and the balancing cylinder (21) and the pilot valve (14); the pressure measuring pipe (22) and the balance cylinder (21) form a U-shaped structure.
- 2. The pilot operated safety valve online verification system according to claim 1, wherein the liquid in the pressure measuring tube (22) and the liquid replenisher (24) is water or saturated salt water;the fourth control valve (13) is a three-way control valve.
- 3. The pilot operated safety valve on-line verification system according to claim 1, wherein the volume of the balancing cylinder (21) is larger than the amount of water injected into the pressure measuring tube (22) by the fluid infusion device (24);the bottom of the pressure measuring pipe (22) is connected with the bottom of the balance cylinder (21) through a guide pipe to form a U-shaped structure, and the fourth control valve (13) is connected with the top of the balance cylinder (21) through a guide pipe.
- 4. The pilot operated safety valve online verification system according to claim 1, wherein the test pressure recorder comprises: the device comprises a floating ball (25), a connecting rod (26), a recording pen (27) and a recording plate (28) which is arranged corresponding to the recording pen (27) which are sequentially connected;the floating ball (25) is placed on the liquid level of the pressure measuring pipe (22) and used for floating up and down along with the liquid level in the pressure measuring pipe (22), the recording plate (28) moves slowly along the horizontal direction, the floating ball (25) drives the recording pen (27) to record the change of the liquid level height in the pressure measuring pipe (22) on the recording plate (28) through the connecting rod (26), and the setting pressure of the pilot valve (14) is calculated through the recorded change of the liquid level height.
- The online calibration system of kinds of pilot operated relief valves is used for carrying out the online calibration of linkage of pilot valve and main valve for the pilot operated relief valve on inflammable and explosive, low temperature low pressure storage tank (11), its characterized in that includes:a fourth control valve (13) is arranged on a pressure guide pipe between a pilot valve (14) and a main valve (15) of the pilot operated safety valve, a third control valve (32) which is connected in sequence through a guide pipe, a bottle body (31) which is used for carrying out integral pressure boosting on the pilot operated safety valve through inputting inert gas which is filled, and a U-shaped main valve opening tester (34) which is connected with a main valve discharge port at the end and is used for judging whether the main valve (15) is opened in linkage or not when the pilot valve (14) is opened through liquid level change;wherein the fourth control valve (13) and the third control valve (32) are connected by a conduit for controlling the mutual conductance between the pilot valve (14), the main valve (15) and their conduits.
- 6. The on-line verification system for a pilot operated safety valve according to claim 5, wherein the bottle (31) filled with inert gas is a nitrogen gas bottle;the liquid in the main valve opening tester (34) is water or saturated salt water;the fourth control valve (13) is a three-way control valve;the U-shaped main valve opening tester (34) is a U-shaped pipe.
- 7, kinds of pilot operated relief valve on-line verification system for on-line verification of pilot operated relief valve on inflammable and explosive, low temperature low pressure storage tank (11) the setting pressure of pilot valve and main valve, the linkage on-line verification of pilot valve and main valve, its characteristic lies in, includes:a fourth control valve (13) is arranged on a pressure guide pipe between a pilot valve (14) and a main valve (15) of the pilot operated safety valve, a second control valve (33), a balance cylinder (21), a pressure measuring pipe (22) used for increasing the working pressure of the pilot operated safety valve to open the pilot valve (14) through gas filled in the liquid compression balance cylinder (21), an -th control valve (23) and a liquid supplementing device (24) used for storing liquid are sequentially connected through the pressure guide pipe, and a test pressure recorder arranged on the pressure measuring pipe (22) and used for recording the liquid level height change in the pressure measuring pipe (22) in real time;the fourth control valve (13) is connected with the second control valve (33) through a conduit, a third control valve (32) connected between the fourth control valve (13) and the second control valve (33) through a conduit and a bottle body (31) used for carrying out integral pressure boosting of the pilot operated safety valve through inputting inert gas filled in;and end and main valve discharge port are connected, used for judging the U-shaped main valve opening tester (34) that the said main valve (15) is linked to open when the said pilot valve (14) is opened through the liquid level change;the pressure measuring pipe (22) and the balance cylinder (21) form a U-shaped structure;the fourth control valve (13) is used for controlling the conduction between the pilot valve (14) and the second control valve (33) and the disconnection between the main valve (15) and the balance cylinder (21) and the pilot valve (14) when the setting pressure of the pilot valve and the main valve is verified on line; and the device is used for controlling the mutual conduction of the pilot valve (14), the main valve (15) and the guide pipe thereof when the linkage on-line verification of the pilot valve and the main valve is carried out;the second control valve (33) is used for controlling the conduction between the pilot valve (14) and the balance cylinder (21) when the setting pressure of the pilot valve and the main valve is verified on line; and is used for closing the conduction of the balance cylinder (21) and the pilot operated safety valve when the linkage on-line check of the pilot valve and the main valve is carried out;the third control valve is used for closing the conduction between the bottle body (31) and the pilot type safety valve when the setting pressure of the pilot valve and the main valve is verified on line; and the control device is used for controlling the conduction of the bottle body (31) and the pilot type safety valve when linkage on-line verification of the pilot valve and the main valve is carried out.
- 8. The pilot operated safety valve on-line verification system according to claim 7, wherein the liquid in the pressure measuring tube (22), the fluid replenisher (24), and the main valve opening tester (34) is water or saturated salt water;the fourth control valve (13) is a three-way control valve;the volume of the balance cylinder (21) is larger than the water injection amount of the liquid infusion device (24) injected into the pressure measuring pipe (22).
- 9. The pilot operated safety valve online verification system according to claim 7, wherein the test pressure recorder comprises: the device comprises a floating ball (25), a connecting rod (26), a recording pen (27) and a recording plate (28) which is arranged corresponding to the recording pen (27) which are sequentially connected;the floating ball (25) is placed on the liquid level of the pressure measuring pipe (22) and used for floating up and down along with the liquid level in the pressure measuring pipe (22), the recording plate (28) moves slowly along the horizontal direction, the floating ball (25) drives the recording pen (27) to record the change of the liquid level height in the pressure measuring pipe (22) on the recording plate (28) through the connecting rod (26), and the setting pressure of the pilot valve (14) is calculated through the recorded change of the liquid level height.
- 10. The on-line verification system for a pilot operated safety valve according to claim 7, wherein the bottle (31) filled with inert gas is a nitrogen gas bottle;the U-shaped main valve opening tester (34) is a U-shaped pipe.
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| CN201920939041.5U CN210005240U (en) | 2019-06-21 | 2019-06-21 | kinds of pilot operated safety valve on-line checking system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110296827A (en) * | 2019-06-21 | 2019-10-01 | 深圳市特种设备安全检验研究院 | A kind of pilot operated safety valve on-line testing system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110296827A (en) * | 2019-06-21 | 2019-10-01 | 深圳市特种设备安全检验研究院 | A kind of pilot operated safety valve on-line testing system and method |
| CN110296827B (en) * | 2019-06-21 | 2024-06-21 | 深圳市质量安全检验检测研究院 | Online calibration system and method for pilot-operated safety valve |
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Effective date of registration: 20210926 Address after: 518005 agricultural science and technology building, No. 1085, south of chaguang Road, Xili street, Nanshan District, Shenzhen, Guangdong Patentee after: Shenzhen Institute of quality and safety inspection and testing Address before: 518024 special inspection building, No. 1032, Honggang Road, Qingshuihe street, Luohu District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN INSTITUTE OF SPECIAL EQUIPMENT INSPECTION AND TEST |