CN201417215Y - On-line check meter of servo protection valve - Google Patents
On-line check meter of servo protection valve Download PDFInfo
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- CN201417215Y CN201417215Y CN2009201579887U CN200920157988U CN201417215Y CN 201417215 Y CN201417215 Y CN 201417215Y CN 2009201579887 U CN2009201579887 U CN 2009201579887U CN 200920157988 U CN200920157988 U CN 200920157988U CN 201417215 Y CN201417215 Y CN 201417215Y
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Abstract
The utility model discloses an on-line check meter of servo protection valves, a connecting screw rod is fixedly connected to a valve rod of a protection valve, an oil cylinder is arranged on a base of the protection valve, and an oil cylinder back-up plate is arranged between the oil cylinder and the base of the protection valve; a elevating power sensor is arranged on the oil cylinder; the connecting screw rod passes through from the centers of the oil cylinder and the elevating power sensor and is fixed on the elevating power sensor; two piston rods capable of moving up and down are arranged in the oil cylinder, and the lower end of the piston rods are provided with chamfer angles; the side faces of the oil cylinder head and tail are provided with one mouth respectively, the mouths areconnected with mouth connectors through high-pressure oil tubes; the tail of the cylinder is provided with a displacement sensor, and the displacement sensor and the elevating power sensor are connected with an electric control element respectively. the utility model is capable of controlling lifting speed and lifting height automatically, has high detection precision and sensitivity, is capable of reducing check cost of the protection valve and labor strength of workers, and improving work efficiency; installation is convenient and simple, it is possible to ensure the protection valve to return rapidly to construct a safe construction environment.
Description
[technical field]
The utility model relates to the calibration equipment field of mechanical field, relates in particular to a kind of servo-type safety valve on-line testing instrument.
[background technology]
In recent years along with fast development of national economy, the demand of oil, industrial chemicals is increased considerably, the petrochemical complex industry obtains fast development, and the process units scale is increasing, and working depth is constantly deepened.The petrochemical complex industry plays an important role in national economy, is one of mainstay industry of China's economic development.Safety valve as the safety attachment of petroleum chemical enterprise's pressure vessel and pressure pipeline equipment, is to guarantee petroleum chemical enterprise's pressure vessel and pressure pipeline safety, prevents the important means of major accident.Safety valve is a kind of automatic valve, and when pressure was higher than predetermined value, safety valve did not utilize the power of medium itself to discharge the fluid of certain amount quantity by any external force, to prevent the over proof safety value of pressure; After pressure was replied normally, valve row was again closed and is stoped medium to continue to flow out.The security of petrochemical valve is normally operated on high temperature, the high-tension apparatus, medium mostly is poisonous, harmful, inflammable, explosive material, under physics, chemical factor effects such as on-stream pressure, temperature, medium cleanliness factor and surrounding medium corrosion, safety valve performance particularly set-pressure and sealing property can change, to cause the opened by pressure that safety valve can not be in accordance with regulations or return seat, cause production safety hidden danger contaminated environment.
The on-line testing of safety valve and blowdown valve, debugging are the specialized technology that new development is in recent years got up.The adjusting and measuring on line of safety valve is exactly the process that the opening pressure to safety valve detects, adjusts under user mode; just be with the opening pressure of adjusting safety valve under the pressure condition, this process claims again: the band at labour adjustment or safety valve of safety valve is pressed the adjustment or the safety valve adjustment of not stopping.Because during the on-line measurement opening pressure of safety valve, device need not stop, produce and carry out as usual.Therefore, this technology one occurs, and at first causes the very big interest of industry member, especially modernized process industry.Many information materials confirm, the Adjusting and Measuring Safety Valve on Line The Application of Technology has solved the hard nut to crack in many safety valve, the blowdown valve operational process, as returning a safety valve emergency processing that leakage is arranged etc. after do not stop on-the-spot online level pressure, the take-off again, continuity and the security of operation produced have been guaranteed effectively.
At present, when detecting safety valve, generally all need safety valve disassembled to move on the testing table to carry out, i.e. offline inspection.This detection method not only need be carried out under dead ship condition, and labour intensity is big, and inefficiency is often higher when the set pressure that mixes up under cold conditions is put on the loop.If be the welding valve, can't carry out off-line check.Some country adopts electronic logger to test, but needs deal with data by hand, calculate loaded down with trivial details, inefficiency, the needs of incompatibility modern chemical industry device on-line testing.Safety valve on-line testing equipment of the prior art can not be controlled pulling speed and hoisting depth automatically; Accuracy of detection and sensitivity are lower; Can not realize Automatic Control; Trouble is installed and is subjected to the site operation environmental impact big; The personnel operation level has a significant impact measurement result; Can not guarantee that safety valve returns seat rapidly, in the construction testing process, have major safety risks.
[utility model content]
The purpose of this utility model is in order to overcome the deficiencies in the prior art, a kind of servo-type safety valve on-line testing instrument to be provided, its have carry, easy for installation, simple to operate, measurement data is accurate, to the undisturbed characteristics of operating mode.
The utility model provides a kind of servo-type safety valve on-line testing instrument, comprise mechanical clamp, hydraulic power unit, data processing unit and power supply, mechanical clamp comprises oil cylinder, the attaching nut, connecting screw rod, the lifting force sensor, wherein, oil cylinder is the right cylinder of a hollow, the lifting force sensor is arranged on the top of oil cylinder, be hollow circular ring shape, connecting screw rod passes from the middle position of oil cylinder and lifting force sensor, and be fixed on the lifting force sensor by the attaching nut, the connecting screw rod lower end is provided with jointing, is provided with a piston rod moving up and down in the oil cylinder, and described piston-rod lower end is provided with chamfering, oil cylinder is made up of cylinder head and cylinder tail, the cylinder head side of oil cylinder is provided with two cylinder head port connections, and the side of cylinder tail is provided with two cylinder tail oil mouth joints, and the cylinder tail of oil cylinder is provided with displacement transducer facing to the chamfering place; Hydraulic power unit comprises hydraulic pump, solenoid directional control valve, ratio pressure surplus valve, motor, oil path block, wherein, motor links to each other with hydraulic pump, hydraulic pump, ratio pressure surplus valve, oil path block, solenoid directional control valve, speed-regulating valve link to each other successively, two hydraulic fluid ports are set on the oil path block, also are provided with the system pressure sensor on the oil path block; Data processing unit comprises computing machine or PC, appliance controling element, computing machine or PC link to each other with appliance controling element, appliance controling element one end links to each other with lifting force sensor, displacement transducer, system pressure sensor respectively, the electric controling element other end links to each other with power supply, and the cylinder tail of described mechanical clamp, cylinder head port connection link to each other with the corresponding hydraulic fluid port of hydraulic power unit by high-pressure oil pipe respectively.
Described lifting force sensor, displacement transducer, system pressure sensor link to each other by sensor cable with electric controling element.
Described oil cylinder bottom is provided with the oil cylinder pad, and this oil cylinder pad can adopt one of plastics, spring, rubber sheet gasket.
Described jointing is metric system or attaching nut made in Great Britain.
Described jointing is a thread spindle.
Three screw holes that are mutually 120 degree are set on the described jointing.
The polished rod chuck special is set on the described jointing.
Be set to strong magnet on the described jointing.
The utility model compared with prior art, have the following advantages: the utility model is by attaching nut and connecting screw rod, safety valve and mechanical clamp of the present utility model are coupled together, and can control pulling speed and hoisting depth automatically by solenoid directional control valve, ratio pressure surplus valve, computing machine.Because the utility model is automatic detection, be not subjected to the influence of subjective factor, accuracy of detection and highly sensitive has reduced the verification cost and the working strength of workers of safety valve, increases work efficiency; Easy for installation simple, can guarantee that safety valve returns seat rapidly, build the construction environment of safety.
[description of drawings]
Fig. 1 is the structural representation of the utility model servo-type safety valve on-line testing instrument;
Fig. 2 is the oil cylinder cross-sectional view of the utility model servo-type safety valve on-line testing instrument.
[embodiment]
For further setting forth the utility model is to reach technological means and the effect that predetermined purpose is taked, below in conjunction with accompanying drawing and preferred embodiment, to according to the servo-type safety valve on-line testing instrument that the utility model proposes, its embodiment, structure, feature and effect thereof, illustrate as after.
The utility model embodiment is a kind of servo-type safety valve on-line testing instrument, comprise mechanical clamp, hydraulic power unit, data processing unit and power supply, as Fig. 1, shown in Figure 2, mechanical clamp comprises oil cylinder 1, the attaching nut 3, connecting screw rod 4, lifting force sensor 2, wherein, oil cylinder 1 is the right cylinder of a hollow, lifting force sensor 2 is arranged on the top of oil cylinder 1, be hollow circular ring shape, connecting screw rod 4 passes from the middle position of oil cylinder 1 and lifting force sensor 2, and be fixed on the lifting force sensor 2 by attaching nut 3, the position of connecting screw rod 4 is immobilized with respect to lifting force sensor 2, connecting screw rod 4 lower ends are provided with jointing 5, connecting screw rod 4 is fixedlyed connected with the valve rod of safety valve to be tested by jointing 5, be provided with a piston rod 24 moving up and down in the oil cylinder 1, described piston rod 24 lower ends are provided with chamfering 30, oil cylinder 1 is made up of cylinder head 22 and cylinder tail 23, cylinder head 22 sides of oil cylinder 1 are provided with two cylinder head port connections 26, the side of cylinder tail 23 is provided with two cylinder tail oil mouth joints 25, cylinder head port connection 26, the purpose that cylinder tail oil mouth joint 25 all is set to two is that one of them is standby, for the time providing hydraulic oil, work uses for one, standby joint also can help to get rid of in-oil cylinder air, two joints are regardless of primary and secondary, the cylinder tail 23 of oil cylinder 1 is provided with displacement transducer 6 facing to chamfering 30 places, and displacement sensor 6 can be responded to the distance that chamfering 30 moves; Hydraulic power unit comprises hydraulic pump 14, solenoid directional control valve 20, ratio pressure surplus valve 21, motor 17, oil path block 16, wherein, motor 17 links to each other with hydraulic pump 14, hydraulic pump 14, ratio pressure surplus valve 21, oil path block 16, solenoid directional control valve 20, speed-regulating valve 18 link to each other successively, two hydraulic fluid ports 15,19 are set on the oil path block 16, also be provided with system pressure sensor 27 on the oil path block 16, speed-regulating valve 18 is used for regulating the flow velocity of liquid; Data processing unit comprises computing machine or PC13, appliance controling element 12, computing machine or PC13 link to each other with appliance controling element 12, appliance controling element 12 1 ends link to each other with lifting force sensor 2, displacement transducer 6, system pressure sensor 27 respectively, electric controling element 12 other ends link to each other with power supply, so electric controling element 12 provides power supply for coupled sensor, the cylinder tail of described mechanical clamp, cylinder head port connection 25,26 link to each other with the hydraulic fluid port 19,15 of hydraulic power unit by high- pressure oil pipe 10,9 respectively.
Lifting force sensor 2, displacement transducer 6, system pressure sensor 27 link to each other by lifting force sensor cable 8, displacement transducer cable 11, system pressure sensor cable with appliance controling element 12.
In the present embodiment, when servo-type safety valve on-line testing instrument of the present utility model is installed, oil cylinder 1 bottom is provided with oil cylinder pad 7, oil cylinder 1 is placed on the valve seat of safety valve to be tested, oil cylinder pad 7 is between the valve seat of oil cylinder 1 and safety valve to be tested, play effect shockproof, anticollision, this oil cylinder pad 7 can adopt one of plastics, spring, rubber sheet gasket.Displacement sensor 6 is measured the height that piston rod 24 promotes by the distance that induction chamfering 30 moves.
For being connected between the mechanical clamp of realizing safety valve to be tested and servo-type safety valve on-line testing instrument, the valve rod of safety valve to be tested should stretch out the about 8-10mm in level pressure setting nut upper surface on the tested safety valve, connecting screw rod 4 can be fixedlyed connected by jointing 5 with the valve rod of safety valve, if the valve rod of safety valve has connecting thread, then jointing 5 can be set to the metric system attaching nut that matches with this screw thread; If the valve rod exposed junction does not have screw thread, according to the big young pathbreaker of the stem diameter section of stretching out hitch, when stem diameter causes being not suitable for hitch too greatly, the section of stretching out can be processed into internal thread, jointing 5 is set to the thread spindle supporting with this internal thread.When the valve rod exposed junction does not have screw thread, the mode of fixedlying connected also comprises following mode to connecting screw rod 4 with the safety valve valve rod: three of processing are mutually the screw hole of 120 degree on jointing 5, tighten on the valve rod with jackscrew again, more than three screw holes make certain angle of inclination, this angle of inclination has guaranteed fixedly valve rod of jackscrew, and this kind situation is compelling force emergent use when 100kg is following; When compelling force surpasses 100kg, also can adopt the polished rod chuck special, the fastening valve rod exposed junction of the triangle claw of chuck is finished being connected of safety valve and mechanical clamp; The valve rod exposed junction is too short can't normally connect the time, can adopt method bonding or the spot welding screw rod to connect; Adopt strong magnetic to connect.
The principle of work of the servo-type safety valve on-line testing instrument of the utility model embodiment is: at first connect with the mains, one end electromagnet of motor 17 and solenoid directional control valve 20 gets electric, and by computing machine or PC13 electric current that increases progressively gradually of proportion electro-magnet with electric controling element 12 supply ratio pressure surplus valves 21; This moment, hydraulic oil was passed by ratio pressure surplus valve 21 successively by hydraulic pump 14, oil path block 16, solenoid directional control valve 20, speed-regulating valve 18, the hydraulic fluid port 19 of hydraulic power unit, high-pressure oil pipe 10, the cylinder tail oil mouth joint 25 of mechanical clamp enters the cavity of resorption of oil cylinder 1, the increasing progressively electric current of proportion electro-magnet of the oil pressure passing ratio Pressure relief valve 21 of hydraulic oil and increasing gradually, when pressure reaches tested safety valve can opening pressure the time, the piston rod 24 of oil cylinder 1 inside moves upward under the promotion of hydraulic coupling, and then make lifting force sensor 2 upwards move, by attaching nut 3, connecting screw rod 4, the drive of jointing 5, make the valve rod of tested safety valve move upward, the lifting height that this moment, displacement transducer 6 was determined piston rod 24 by the displacement on the chamfering inclined-plane of induction piston bar 24 belows is the hoisting depth of tested valve rod just, before the lifting height of piston rod reaches during by the default displacement height of computing machine or PC13, displacement transducer 6 sends the other end electromagnet power supply that signal is given solenoid directional control valve 20, thereby realized the switching of oil circuit, make high-pressure oil passage pass through another path of oil path block 16, hydraulic fluid port 15 through hydraulic power unit, high-pressure oil pipe 9, the cylinder head port connection 26 of mechanical clamp arrives the epicoele of oil cylinder 1, the hydraulic oil of oil cylinder cavity of resorption is owing to the pressure current oil sump tank of hydraulic oil, and the valve rod of tested safety valve resets; This end of test (EOT), the numerical value of computing machine or PC13 record lifting force sensor 2, displacement transducer 6, system pressure sensor 27, calculate the height that the valve rod of tested safety valve need be adjusted, and computing machine or PC13 can handle obtaining data by software, as show parameters such as test curve, test duration, set-pressure, adjustment height, operating personnel can regulate the level pressure nut location of tested safety valve according to the adjustment height of computing machine or PC13 prompting.
The function of the servo-type Adjusting and Measuring Safety Valve on Line instrument each several part of the utility model embodiment is as follows:
Mechanical clamp is used for guaranteeing safety valve to be measured is implemented the clamping location, for hydraulic power unit provides the environment that applies external force, adopts fabricated structure, dismantles very convenient.
The function of hydraulic power unit be output high pressure liquid power and convert the flap that acts on the test safety valve to upwards drive compelling force so that finish the measurement of opening pressure.Hydraulic power unit: adjustable hydraulic pressure output and flow are provided, maximum output 18MPa, feed pull maximum is 70KN (thousand Ns), the lifting force and the pulling speed that add in order to control, the effect of the ratio pressure surplus valve 21 of hydraulic power unit is control and regulates hydraulic power, i.e. fluid flow and flow velocity; The flow direction that act as rapid conversion hydraulic oil of solenoid directional control valve 20 is guaranteed job safety; Hydraulic oil generally adopts not too high can the using of viscosity, when low temp area uses, can add anti-condensing agent.
Lifting force sensor 2 adopts spoke structure, and sensitivity is high, and precision can reach 0.05% (lagging characteristics of sensor), and system pressure sensor 27 adopts the high temperature modification sensor, and working temperature can reach 200～250 degree.Two kinds of sensors are high output type, in amplifier is set, its linearity, repeatability and antijamming capability are extremely strong.Test macro has adopted two passage low gains, the high precision amplifying circuit, intelligent A/D conversion (also claims " analog-digital converter ", be called for short " analog to digital converter ") and data acquisition circuit, can gather pulling force simultaneously, pressure, three parameters of displacement, the core is selected advanced in the market notebook computer for use, but curve plotting and printing test result, man-machine conversation function with Hanzify, each data of measuring passage all can show on screen, under the situation of outrange, guarantees the safety of system and safety valve, all the hardware using modular construction is convenient to maintenance and debugging.
The servo-type safety valve on-line testing instrument of the utility model embodiment has following characteristics: (1) device need not stop, and must adjust in the cycle to safety valve and to have guaranteed the work requirements of enterprise's long period, full load in the requirement satisfying national technical supervision department; (2) in process of production, to the kick safety valve force back the seat after adjust; (3) behind the cold conditions off-line, adjust (hot school better solves the influence of temperature to opening pressure of safety valve than cold school) of on-the-spot hot error; (4) after the parking, the safety valve after the on-site maintenance is carried out adjustment; (5) can carry out cold conditions, exempt to tear open adjustment the part safety valve; (6) to the on-the-spot adjustment of welded type safety valve; (7) cooperate the off-line checking table that high-pressure safety valve is adjusted.
The servo-type Adjusting and Measuring Safety Valve on Line instrument that the utility model embodiment provides is the adjusting and measuring on line device that a employing flap fine motion method is declared out criterion, this device is adapted to various spring safety valves in the boilers and pressure vessel field, the blowdown valve opening pressure detects, it can not measure the opening pressure of safety valve under the parking condition at process units, and does not need to press in the raising system.It is easy to carry, simple to operate, the measurement data error is in requiring error range, operating mode there is not disturbance, the life cycle of using the utility model can prolong equipment is built safe production environment, has reduced the verification cost and the working strength of workers of safety valve, increase work efficiency, for the user has brought good economic benefit.
In this instructions, the utility model is described with reference to its certain embodiments, still, still can make various modifications and conversion obviously and does not deviate from spirit and scope of the present utility model.Therefore, instructions of the present utility model and accompanying drawing are considered to illustrative and nonrestrictive.
Claims (8)
1, a kind of servo-type safety valve on-line testing instrument, comprise mechanical clamp, hydraulic power unit, data processing unit and power supply, it is characterized in that, mechanical clamp comprises oil cylinder, the attaching nut, connecting screw rod, the lifting force sensor, wherein, oil cylinder is the right cylinder of a hollow, the lifting force sensor is arranged on the top of oil cylinder, be hollow circular ring shape, connecting screw rod passes from the middle position of oil cylinder and lifting force sensor, and is fixed on the lifting force sensor by the attaching nut, and the connecting screw rod lower end is provided with jointing, be provided with a piston rod moving up and down in the oil cylinder, described piston-rod lower end is provided with chamfering, and oil cylinder is made up of cylinder head and cylinder tail, and the cylinder head side of oil cylinder is provided with two cylinder head port connections, the side of cylinder tail is provided with two cylinder tail oil mouth joints, and the cylinder tail of oil cylinder is provided with displacement transducer facing to the chamfering place; Hydraulic power unit comprises hydraulic pump, solenoid directional control valve, ratio pressure surplus valve, motor, oil path block, wherein, motor links to each other with hydraulic pump, hydraulic pump, ratio pressure surplus valve, oil path block, solenoid directional control valve, speed-regulating valve link to each other successively, two hydraulic fluid ports are set on the oil path block, also are provided with the system pressure sensor on the oil path block; Data processing unit comprises computing machine or PC, appliance controling element, computing machine or PC link to each other with appliance controling element, appliance controling element one end links to each other with lifting force sensor, displacement transducer, system pressure sensor respectively, the electric controling element other end links to each other with power supply, and the cylinder tail of described mechanical clamp, cylinder head port connection link to each other with the corresponding hydraulic fluid port of hydraulic power unit by high-pressure oil pipe respectively.
2, servo-type safety valve on-line testing instrument as claimed in claim 1 is characterized in that described lifting force sensor, displacement transducer, system pressure sensor link to each other by sensor cable with electric controling element.
3, servo-type safety valve on-line testing instrument as claimed in claim 2 is characterized in that described oil cylinder bottom is provided with the oil cylinder pad, and this oil cylinder pad can adopt one of plastics, spring, rubber sheet gasket.
4, servo-type safety valve on-line testing instrument as claimed in claim 3 is characterized in that, described jointing is metric system or attaching nut made in Great Britain.
5, servo-type safety valve on-line testing instrument as claimed in claim 3 is characterized in that described jointing is a thread spindle.
6, servo-type safety valve on-line testing instrument as claimed in claim 3 is characterized in that, three screw holes that are mutually 120 degree are set on the described jointing.
7, servo-type safety valve on-line testing instrument as claimed in claim 3 is characterized in that, the polished rod chuck special is set on the described jointing.
8, servo-type safety valve on-line testing instrument as claimed in claim 3 is characterized in that, is set to strong magnet on the described jointing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201579887U CN201417215Y (en) | 2009-06-08 | 2009-06-08 | On-line check meter of servo protection valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201579887U CN201417215Y (en) | 2009-06-08 | 2009-06-08 | On-line check meter of servo protection valve |
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| Publication Number | Publication Date |
|---|---|
| CN201417215Y true CN201417215Y (en) | 2010-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009201579887U Expired - Fee Related CN201417215Y (en) | 2009-06-08 | 2009-06-08 | On-line check meter of servo protection valve |
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| CN (1) | CN201417215Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102892565A (en) * | 2010-05-17 | 2013-01-23 | 雅典娜自动化股份有限公司 | Injection unit with piston position measurement system |
| CN104406781A (en) * | 2014-11-26 | 2015-03-11 | 广西华银铝业有限公司 | On-line safety valve checking method and device |
| CN105910809A (en) * | 2016-06-02 | 2016-08-31 | 苏州协捷精密机械有限公司 | Fuel tank safety valve performance test machine |
| CN106246854A (en) * | 2016-08-24 | 2016-12-21 | 四川科路控制工程有限公司 | Bidirectional ratchet hydraulic actuator and testing device of safety valve |
| CN106872160A (en) * | 2017-03-10 | 2017-06-20 | 武汉市锅炉压力容器检验研究所 | One kind is without valve rod spring loaded safety valve on-line testing device |
| WO2019010921A1 (en) * | 2017-07-11 | 2019-01-17 | 江南大学 | Safety valve online monitoring system |
| CN111677719A (en) * | 2020-06-18 | 2020-09-18 | 北京天地玛珂电液控制***有限公司 | Automatic test system and method for electromagnetic directional valve |
-
2009
- 2009-06-08 CN CN2009201579887U patent/CN201417215Y/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102892565A (en) * | 2010-05-17 | 2013-01-23 | 雅典娜自动化股份有限公司 | Injection unit with piston position measurement system |
| US8932040B2 (en) | 2010-05-17 | 2015-01-13 | Athena Automation Ltd. | Injection unit with a piston position measurement system |
| CN102892565B (en) * | 2010-05-17 | 2016-02-17 | 雅典娜自动化股份有限公司 | With the injection device of piston position measuring system |
| CN104406781A (en) * | 2014-11-26 | 2015-03-11 | 广西华银铝业有限公司 | On-line safety valve checking method and device |
| CN105910809A (en) * | 2016-06-02 | 2016-08-31 | 苏州协捷精密机械有限公司 | Fuel tank safety valve performance test machine |
| CN105910809B (en) * | 2016-06-02 | 2018-06-22 | 昆山迈思特自动化科技有限公司 | A kind of safety valve of oil tank performance test machine |
| CN106246854A (en) * | 2016-08-24 | 2016-12-21 | 四川科路控制工程有限公司 | Bidirectional ratchet hydraulic actuator and testing device of safety valve |
| CN106872160A (en) * | 2017-03-10 | 2017-06-20 | 武汉市锅炉压力容器检验研究所 | One kind is without valve rod spring loaded safety valve on-line testing device |
| WO2019010921A1 (en) * | 2017-07-11 | 2019-01-17 | 江南大学 | Safety valve online monitoring system |
| CN111677719A (en) * | 2020-06-18 | 2020-09-18 | 北京天地玛珂电液控制***有限公司 | Automatic test system and method for electromagnetic directional valve |
| CN111677719B (en) * | 2020-06-18 | 2022-04-08 | 北京天玛智控科技股份有限公司 | Automatic test system and method for electromagnetic directional valve |
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Addressee: Beijing Elite Science & Technology Development Co., Ltd. Document name: Notification to Pay the Fees |
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| DD01 | Delivery of document by public notice |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100303 Termination date: 20130608 |