CN111721525B - Pilot valve performance test device and test method - Google Patents
Pilot valve performance test device and test method Download PDFInfo
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- CN111721525B CN111721525B CN202010798082.4A CN202010798082A CN111721525B CN 111721525 B CN111721525 B CN 111721525B CN 202010798082 A CN202010798082 A CN 202010798082A CN 111721525 B CN111721525 B CN 111721525B
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
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Abstract
The invention discloses a pilot valve performance test device and a test method, aiming at solving the defects of large investment and inconvenient operation of pilot valve performance test equipment. The device comprises a test seat arranged on a pressure test table, wherein an air storage cavity is arranged in the test seat, the pressure test table is communicated with an air supply pipe to the air storage cavity, a pressure taking connector, a mounting seat and a support used for mounting a pilot valve are arranged on the test seat, an air inlet, an air outlet and an air outlet are arranged on the pilot valve, a ventilation cavity used for simulating an air chamber of a main valve is arranged on the mounting seat, a pressure gauge is arranged on the ventilation cavity, an air inlet pipe is connected between the air inlet and the pressure taking connector, and an air outlet pipe is communicated between the air outlet and the ventilation cavity. The pilot valve performance test device has the advantages of simple structure, low cost and convenient operation.
Description
Technical Field
The invention relates to a valve test device, in particular to a pilot valve performance test device and a test method.
Background
The pilot operated safety valve consists of a pilot valve and a main valve, wherein the performance of the pilot valve plays a decisive role in the performance of the whole pilot operated safety valve. In the process of product development and mass production assembly, poor valve performance or valve failure is sometimes encountered, and the main valve or the pilot valve cannot be determined in the first time. The main reason is that a professional testing device is lacked, and the performance test of the pilot valve and the main valve cannot be carried out in time. At present, the performance test of the pilot valve and the main valve is generally carried out by means of a large-sized safety valve performance test device, the equipment investment is large, the operation is inconvenient, and the performance of the pilot valve cannot be truly reflected.
Disclosure of Invention
The invention overcomes the defects of large investment and inconvenient operation of the pilot valve performance test equipment, and provides the pilot valve performance test device and the test method.
In order to solve the technical problems, the invention adopts the following technical scheme: the pilot valve performance test device comprises a test seat installed on a pressure test table, wherein an air storage cavity is arranged in the test seat, the pressure test table is communicated with an air supply pipe to the air storage cavity, a pressure tapping connector, an installation seat and a support used for installing a pilot valve are arranged on the test seat, an air inlet, an air outlet and an air exhaust port are arranged on the pilot valve, a ventilation cavity used for simulating an air chamber of a main valve is arranged on the installation seat, a pressure gauge is installed on the ventilation cavity, an air inlet pipe is connected between the air inlet and the pressure tapping connector, and an air outlet pipe is communicated between the air outlet and the ventilation cavity.
When the pilot valve performance testing device is used for testing, the method comprises the following steps: a. installing a pilot valve to be tested on a support, connecting an air inlet pipe between an air inlet of the pilot valve and a pressure taking connector, and communicating an air outlet pipe between an air outlet of the pilot valve and a ventilation cavity; b. the pressure test table supplies gas into the gas storage cavity through the gas supply pipe, the pressure in the gas storage cavity is continuously increased, when the pressure is increased to the setting pressure of the pilot valve, the pilot valve is heard or felt by touch to exhaust, and the pressure gauge connected to the ventilation cavity detects that the pressure is obviously reduced, which indicates that the pilot valve is opened at the moment; the pilot valve fault is judged when the pilot valve which is regulating the setting pressure cannot be regulated to the specified opening pressure all the time, the pilot valve fault c is judged when the pilot valve which is regulating the setting pressure is not opened, the pressure test table slowly releases the pressure after the pilot valve is opened, and when the pressure in the ventilation cavity detected by the pressure gauge is consistent with the air supply pressure of the pressure test table, the pilot valve returns to the seat; if the pilot valve recoil pressure is adjustable, the pressure of the pressure test table is reduced to the target pressure, the recoil pressure of the pilot valve is adjusted, and when the pressure in the ventilation cavity detected by the pressure gauge is consistent with the air supply pressure of the pressure test table, the pilot valve is recoated. The pilot valve testing device can be used for testing by means of the production test bed, is simple in structure and low in cost, does not need a large amount of air, ensures that the air in the air storage cavity is enough to complete the action process of the whole pilot valve, and is simple and convenient in the whole test operation process.
Preferably, the vent cavity is provided with a vent valve. The vent valve facilitates venting of the vent chamber so that the pilot valve need not be opened each time the recoil pressure is measured multiple times.
Preferably, a sealing disc is tightly arranged between the pressure test table and the test seat, and sealing rings are arranged between the upper surface of the sealing disc and the test seat and between the lower surface of the sealing disc and the pressure test table. The sealing performance of the test seat connected with the pressure test table is improved by the sealing disc.
Preferably, the air inlet pipe is a hose. The hose is flexible and convenient to use.
Preferably, the support is in an L-shaped structure, and is connected to the edge position of the upper end of the test seat. The L-shaped support facilitates the installation of the pilot valve.
Preferably, the test seat is provided with a mounting port, the mounting port is tightly connected with the connecting seat, a plurality of outer sliding holes are uniformly distributed in the connecting seat, outer piston rods are mounted in the outer sliding holes in a matched mode, one end of each outer piston rod is provided with a positioning flange, the other end of each outer piston rod is provided with a butt joint head, a butt joint spring is mounted between each butt joint head and the outer surface of the connecting seat, the positioning flanges are butted on the inner surface of the connecting seat, a rotating ring is mounted on the test seat, a plurality of arc-shaped pushing strips are uniformly distributed on the end face of each rotating ring facing the outer piston rod, the end face of each pushing strip is obliquely arranged from one end to the other end, and the pushing strips rotate along with the rotating ring to enable the end face of each pushing strip to slide through the butt joint heads on the outer piston rods to push the outer piston rods to the air storage cavities.
The rotating ring rotates, the end face of the pushing bar slides through the abutting joint head on the outer piston rod to push the outer piston rod to the air storage cavity, the outer piston rod returns under the action of the abutting spring, so that fluctuating air pressure is generated in the air storage cavity, the working condition of the fluctuating air pressure is simulated, and even if the instantaneous pressure of the tempering type pilot valve is higher than the setting pressure of the pilot valve, the pilot valve cannot exhaust; the pilot valve can exhaust when the instantaneous pressure of the sudden-opening pilot valve is higher than the setting pressure of the pilot valve, so that the sudden-opening pilot valve continuously jumps to exhaust due to fluctuating air pressure. The working performance of the pilot valve in a fluctuating air pressure state is simulated through the arrangement of the structure, and the pilot valve can not be quickly opened for exhausting even if the instant pressure of the tempering type pilot valve is higher than the setting pressure of the pilot valve; the pilot valve can be quickly opened to exhaust when the instantaneous pressure of the burst-open pilot valve is higher than the set pressure of the pilot valve, so that the burst-open pilot valve continuously jumps to exhaust due to fluctuating air pressure. The performance of the mass-exchange type and abrupt-opening type pilot valves under the working condition of fluctuating air pressure is well tested.
Preferably, a plurality of inner sliding holes are uniformly distributed in the connecting seat, an inner piston rod is installed in the inner sliding holes in a matched mode, a positioning convex ring is arranged at one end of the inner piston rod, a pushing head is arranged at the other end of the inner piston rod, a positioning spring is installed between the pushing head and the outer surface of the connecting seat, the positioning convex ring is abutted to the inner surface of the connecting seat, an adjusting ring capable of sliding axially is installed in the rotating ring, the adjusting ring is connected with an adjusting piston cylinder telescopic rod, a plurality of arc-shaped pushing guide bars are uniformly distributed on the end face, facing the inner piston rod, of the adjusting ring, the end face of each pushing guide bar is obliquely arranged from one end to the other end, the rotating ring drives the adjusting ring to rotate synchronously, and the pushing guide bars rotate along with the adjusting ring to enable the end face of each pushing guide bar to slide through the pushing head on the inner piston rod to push the inner piston rod to the air storage cavity.
The adjusting piston cylinder is adjusted to push the adjusting ring to move axially, the end face of the adjusting ring is separated from and reunion with the pushing head at the end part of the inner piston rod, when the end face of the adjusting ring is contacted and attached with the pushing head at the end part of the inner piston rod, the rotating ring drives the adjusting ring to rotate synchronously, the pushing guide bar rotates along with the adjusting ring, so that the end face of the pushing guide bar slides over the pushing head on the inner piston rod to push the inner piston rod to the air storage cavity, after the pushing guide bar slides away from the pushing head, the inner piston rod returns under the action of the positioning spring, air pressure in the air storage cavity is further fluctuated, the air pressure fluctuation range is enlarged, the performance test of the guide valve is facilitated, and the test accuracy is improved.
Preferably, the connecting seat is provided with a mounting hole, the mounting hole is matched with and provided with a booster piston column, the sectional area of the outer piston rod and the sectional area of the inner piston rod are both smaller than that of the booster piston column, one end of the booster piston column is connected with a positioning convex ring, the other end of the booster piston column is connected with a telescopic rod of the booster piston cylinder, and the positioning convex ring abuts against the inner surface of the connecting seat.
The boosting piston column is pushed by the boosting piston cylinder to move into the gas storage cavity, the pressure in the gas storage cavity is continuously increased, when the pressure is increased to the pilot valve set pressure, the pilot valve exhausts gas, and a pressure gauge connected to the ventilation cavity detects that the pressure is obviously reduced; and when the pressure detected by the pressure gauge before the pilot valve exhausts is not in the setting pressure range of the pilot valve, judging that the pilot valve is in fault. The structure makes the pressure in the gas storage cavity rise slowly, so that the pressure gauge can read the pressure value at the moment before the pilot valve starts to exhaust.
A pilot valve performance test method utilizes a pilot valve performance test device to carry out tests, and comprises the following steps: a. installing a pilot valve to be tested on a support, connecting an air inlet pipe between an air inlet of the pilot valve and a pressure sampling joint, and communicating an air outlet pipe between an air outlet of the pilot valve and a ventilation cavity; b. the pressure test table supplies gas into the gas storage cavity through the gas supply pipe, the pressure in the gas storage cavity is continuously raised, when the pressure is raised to the setting pressure of the pilot valve, the pilot valve exhausts gas, and the pressure gauge connected to the ventilation cavity detects that the pressure is obviously lowered, which indicates that the pilot valve is opened at the moment; judging the fault of the pilot valve when the pilot valve which is regulating the setting pressure can not be regulated to the specified starting pressure all the time, judging the fault of the pilot valve when the pilot valve which is regulating the setting pressure is not started at the specified pressure, slowly releasing the pressure of a pressure test table after the pilot valve is started, and returning the pilot valve to the seat when the pressure in the ventilation cavity detected by a pressure gauge is consistent with the air supply pressure of the pressure test table; if the pilot valve recoil pressure is adjustable, the pressure of the pressure test table is reduced to the target pressure, the recoil pressure of the pilot valve is adjusted, and when the pressure in the ventilation cavity detected by the pressure gauge is consistent with the air supply pressure of the pressure test table, the pilot valve is recoated.
A pilot valve performance test method utilizes a pilot valve performance test device to carry out tests, and comprises the following steps: a. installing a pilot valve to be tested on a support, connecting an air inlet pipe between an air inlet of the pilot valve and a pressure sampling joint, and communicating an air outlet pipe between an air outlet of the pilot valve and a ventilation cavity; b. the pressure test table supplies air into the air storage cavity through the air supply pipe, so that the pressure in the air storage cavity is slightly lower than the setting pressure of the pilot valve, and the pressure test table stops supplying air into the air storage cavity; c, rotating the rotating ring, pushing the end face of the pushing bar to slide through the abutting joint head on the outer piston rod to push the outer piston rod to the gas storage cavity, returning the outer piston rod under the action of the abutting spring, so that fluctuating air pressure is generated in the gas storage cavity, and simulating the working condition of fluctuating air pressure, so that even if the instantaneous pressure of the tempering type pilot valve is higher than the setting pressure of the pilot valve, the pilot valve cannot be quickly opened for exhausting; the pilot valve can be quickly opened for exhausting when the instantaneous pressure of the suddenly-opened pilot valve is higher than the setting pressure of the pilot valve, so that the suddenly-opened pilot valve continuously jumps for exhausting by fluctuating air pressure; d. the rotating ring stops rotating, the boosting piston column is pushed by the boosting piston cylinder to move into the gas storage cavity, the pressure in the gas storage cavity is continuously increased, when the pressure is increased to the setting pressure of the pilot valve, the pilot valve exhausts gas, and the pressure gauge connected to the ventilation cavity detects that the pressure is obviously reduced, which indicates that the pilot valve is opened at the moment; determining that the pilot valve fails when the pilot valve which is adjusting the setting pressure cannot be adjusted to the specified opening pressure, and determining that the pilot valve fails when the pilot valve which is adjusting the setting pressure is not opened at the specified pressure; e. after the pilot valve is opened, the pressure test table slowly releases pressure, and when the pressure in the vent cavity detected by the pressure gauge is consistent with the air supply pressure of the pressure test table, the pilot valve returns to the seat; if the pilot valve recoil pressure is adjustable, the pressure of the pressure test table is reduced to the target pressure, the recoil pressure of the pilot valve is adjusted, and when the pressure in the ventilation cavity detected by the pressure gauge is consistent with the air supply pressure of the pressure test table, the pilot valve is recoated.
Compared with the prior art, the invention has the beneficial effects that: (1) the pilot valve test device can perform the test when the medium is output from the test bed, has simple structure and low cost, does not need a large amount of air, ensures that the air in the air storage cavity can sufficiently complete the action process of the whole pilot valve, and has simple and convenient whole test operation process; (2) the performance of the quality-adjusting pilot valve and the sudden-opening pilot valve under the condition of fluctuating air pressure is well tested by simulating the condition of fluctuating air pressure.
Drawings
FIG. 1 is a schematic structural view of embodiment 1 of the present invention;
FIG. 2 is a schematic configuration diagram of embodiment 2 of the present invention;
FIG. 3 is an enlarged partial schematic view of FIG. 2 of the present invention;
in the figure: 1. pressure test table, 2, test seat, 3, gas storage cavity, 4, gas supply pipe, 5, pressure taking joint, 6, mounting seat, 7, support, 8, gas inlet, 9, gas outlet, 10, gas outlet, 11, ventilation cavity, 12, pressure gauge, 13, gas inlet pipe, 14, gas outlet pipe, 15, exhaust valve, 16, sealing disc, 17, mounting opening, 18, connecting seat, 19, outer sliding hole, 20, outer piston rod, 21, positioning flange, 22, abutting head, 23, abutting spring, 24, rotating ring, 25, driving motor, 26, driving gear, 27, driven gear ring, 28, pushing strip, 29, check valve, 30, inner sliding hole, 31, inner piston rod, 32, positioning convex ring, 33, pushing head, 34, positioning spring, 35, adjusting ring, 36, adjusting piston cylinder, 37, connecting plate, 38, connecting rod, 39, pushing guide strip, 40, mounting hole, 41 and boosting piston column.
Detailed Description
The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the attached drawings:
example 1: a pilot valve performance test device (see attached figure 1) comprises a test seat 2 arranged on a pressure test table 1, wherein an air storage cavity 3 is arranged in the test seat, and an air supply pipe 4 is communicated with the air storage cavity on the pressure test table. The test can be carried out by means of a factory pressure test table without a large safety valve performance test device, the volume of the gas storage cavity is about 7 liters, and the action process of the whole pilot valve can be completed without a large gas amount. And the test seat is provided with a pressure tapping joint 5, a mounting seat 6 and a support 7 for mounting a pilot valve, and the mounting seat is fixedly connected to the upper end of the test seat. The pilot valve is provided with an air inlet 8, an air outlet 9 and an air outlet 10, the mounting seat is provided with a ventilation cavity 11 for simulating an air chamber of the main valve, the ventilation cavity is provided with a pressure gauge 12, an air inlet pipe 13 is connected between the air inlet and the pressure tapping joint, and an air outlet pipe 14 is communicated between the air outlet and the ventilation cavity. The air inlet pipe is a hose.
The vent chamber is fitted with a vent valve 15. The mounting seat is provided with three air holes communicated with the air cavity, and the exhaust pipe, the pressure gauge and the exhaust valve are respectively arranged on the three air holes. A sealing disc 16 is tightly arranged between the pressure test platform and the test seat, and sealing rings are arranged between the upper surface of the sealing disc and the test seat and between the lower surface of the sealing disc and the pressure test platform. The support is L-shaped structure, and the support is connected at the edge position of the upper end of the test bed. The pilot valve is detachably arranged on the support through a bolt.
A pilot valve performance test method utilizes a pilot valve performance test device to carry out tests, and comprises the following steps: a. installing a pilot valve to be tested on a support, connecting an air inlet pipe between an air inlet of the pilot valve and a pressure sampling joint, and communicating an air outlet pipe between an air outlet of the pilot valve and a ventilation cavity; checking the air tightness of the pipeline to ensure that the pipeline is airtight; b. the pressure test table supplies gas into the gas storage cavity through the gas supply pipe, the pressure in the gas storage cavity is continuously increased, when the pressure is increased to the setting pressure of the pilot valve, the pilot valve is heard or felt by touch to exhaust, and the pressure gauge connected to the ventilation cavity detects that the pressure is obviously reduced, which indicates that the pilot valve is opened at the moment; the pilot valve fault is judged when the pilot valve which is regulating the setting pressure cannot be regulated to the specified opening pressure all the time, the pilot valve fault c is judged when the pilot valve which is regulating the setting pressure is not opened, the pressure test table slowly releases the pressure after the pilot valve is opened, and when the pressure in the ventilation cavity detected by the pressure gauge is consistent with the air supply pressure of the pressure test table, the pilot valve returns to the seat; if the pilot valve recoil pressure is adjustable, the pressure of the pressure test table is reduced to a target pressure, the target pressure guides the recoil pressure value to which the valve is required to adjust, the recoil pressure of the pilot valve is adjusted, and when the pressure in the ventilation cavity detected by the pressure gauge is consistent with the air supply pressure of the pressure test table, the pilot valve is recocked.
Example 2: the utility model provides a pilot valve performance test device (see fig. 2, fig. 3), its structure is similar with embodiment 1, the main difference lies in being equipped with installing port 17 on the test bench in this embodiment, the installing port position zonulae occludens has connecting seat 18, the equipartition is equipped with a plurality of outer slide holes 19 on the connecting seat, outer piston rod 20 is installed to outer slide hole adaptation, outer piston rod one end is equipped with location flange 21, the other end is equipped with butt head 22, installation butt spring 23 between butt head and the connecting seat surface, location flange butt is on the connecting seat internal surface, install swivel ring 24 on the test bench, connect the bearing between swivel ring and the test bench, installation driving motor 25 on the test bench, installation driving gear 26 on the driving motor output shaft, be equipped with driven ring gear 27 on the swivel ring outer wall, driving gear and driven ring gear meshing transmission. The rotating ring is provided with a plurality of arc-shaped pushing strips 28 towards the end face of the outer piston rod, the end faces of the pushing strips are arranged from one end to the other end in an inclined mode, and the pushing strips rotate along with the rotating ring to enable the end faces of the pushing strips to slide over the abutting heads on the outer piston rod to push the outer piston rod to the air storage cavity. A check valve 29 is installed in the supply pipe.
A plurality of inner sliding holes 30 are uniformly distributed in the connecting seat, inner piston rods 31 are installed in the inner sliding holes in a matched mode, one end of each inner piston rod is provided with a positioning convex ring 32, the other end of each inner piston rod is provided with a pushing head 33, a positioning spring 34 is installed between the pushing head and the outer surface of the connecting seat, the positioning convex rings are abutted to the inner surface of the connecting seat, an adjusting ring 35 capable of axially sliding is installed in a rotating ring, positioning convex strips are arranged on the outer wall of the adjusting ring, sliding grooves are formed in the inner wall of the rotating ring, and the positioning convex strips are inserted into the sliding grooves in a sliding mode. The adjusting ring is connected with an adjusting piston cylinder 36 telescopic rod, a bearing is arranged on the adjusting ring, a connecting plate 37 is arranged on the adjusting piston cylinder telescopic rod, and a plurality of connecting rods 38 are uniformly distributed and connected between the connecting plate and the bearing inner ring. The end face of the adjusting ring, facing the inner piston rod, is uniformly provided with a plurality of arc-shaped pushing guide bars 39, the end face of each pushing guide bar is obliquely arranged from one end to the other end, the rotating ring drives the adjusting ring to synchronously rotate, and the pushing guide bars rotate along with the adjusting ring to enable the end face of each pushing guide bar to slide through a pushing head on the inner piston rod to push the inner piston rod to the air storage cavity.
Be equipped with mounting hole 40 on the connecting seat, mounting hole adaptation installation booster piston post 41, the sectional area of outer piston rod's sectional area and inner piston rod all is less than the sectional area of booster piston post, and booster piston post one end is connected and is equipped with the location bulge loop, and the booster piston post other end is connected the booster piston cylinder telescopic link, and the location bulge loop butt is on the connecting seat internal surface. The other structure is the same as embodiment 1.
A pilot valve performance test method utilizes a pilot valve performance test device to carry out tests, and comprises the following steps: a. installing a pilot valve to be tested on a support, connecting an air inlet pipe between an air inlet of the pilot valve and a pressure taking connector, and communicating an air outlet pipe between an air outlet of the pilot valve and a ventilation cavity; b. the pressure test table supplies air into the air storage cavity through the air supply pipe, so that the pressure in the air storage cavity is slightly lower than the setting pressure of the pilot valve, and the pressure test table stops supplying air into the air storage cavity; c, rotating the rotating ring, pushing the end face of the pushing bar to slide through the abutting joint head on the outer piston rod to push the outer piston rod to the gas storage cavity, returning the outer piston rod under the action of the abutting spring, so that fluctuating air pressure is generated in the gas storage cavity, and simulating the working condition of fluctuating air pressure, so that even if the instantaneous pressure of the tempering type pilot valve is higher than the setting pressure of the pilot valve, the pilot valve cannot be quickly opened for exhausting; the pilot valve can be quickly opened for exhausting when the instantaneous pressure of the suddenly-opened pilot valve is higher than the setting pressure of the pilot valve, so that the suddenly-opened pilot valve continuously jumps for exhausting by fluctuating air pressure; d. the rotating ring stops rotating, the booster piston column is pushed by the booster piston cylinder to move into the gas storage cavity, the pressure in the gas storage cavity is continuously increased, when the pressure is increased to the setting pressure of the pilot valve, the pilot valve is heard or felt by touch to exhaust, and the pressure gauge connected to the ventilation cavity detects that the pressure is obviously reduced, which indicates that the pilot valve is opened at the moment; determining that the pilot valve fails when the pilot valve which is adjusting the setting pressure cannot be adjusted to the specified opening pressure, and determining that the pilot valve fails when the pilot valve which is adjusting the setting pressure is not opened at the specified pressure; e. after the pilot valve is started, the pressure test table slowly releases pressure, and when the pressure in the vent cavity detected by the pressure gauge is consistent with the air supply pressure of the pressure test table, the pilot valve returns to the seat; if the pilot valve recoil pressure is adjustable, the pressure of the pressure test table is reduced to a target pressure, the target pressure guides the recoil pressure value to which the valve wants to adjust, the recoil pressure of the pilot valve is adjusted, and when the pressure in the ventilation cavity detected by the pressure gauge is consistent with the air supply pressure of the pressure test table, the pilot valve is recocked.
The above-described embodiments are merely preferred embodiments of the present invention, which is not intended to be limiting in any way, and other variations and modifications are possible without departing from the scope of the invention as set forth in the appended claims.
Claims (8)
1. A pilot valve performance test device is characterized by comprising a test seat arranged on a pressure test table, wherein an air storage cavity is arranged in the test seat, the pressure test table is communicated with an air supply pipe to the air storage cavity, the test seat is provided with a pressure tapping connector, a mounting seat and a support for mounting a pilot valve, the pilot valve is provided with an air inlet, an air outlet and an air outlet, the mounting seat is provided with a ventilation cavity for simulating an air chamber of a main valve, a pressure gauge is arranged on the ventilation cavity, the air inlet is connected with the pressure tapping connector, and the air outlet is communicated with the air outlet pipe; be equipped with the installing port on the test bench, installing port position zonulae occludens has the connecting seat, the equipartition is equipped with a plurality of outer slide holes on the connecting seat, outer piston rod is installed to outer slide hole adaptation, outer piston rod one end is equipped with the location flange, the other end is equipped with the butt head, installation butt spring between butt head and the connecting seat surface, location flange butt is on the connecting seat internal surface, install the swivel becket on the test bench, the swivel becket is equipped with a plurality of curved promotion strips towards the equipartition on the outer piston rod terminal surface, promotion strip terminal surface sets up from one end to the other end slope, it promotes the gas storage cavity promotion with outer piston rod to promote to the butt head that the swivel becket rotates to make promotion strip terminal surface slide on the outer piston rod along with the swivel becket.
2. The pilot valve performance testing apparatus of claim 1, wherein the vent chamber is fitted with an exhaust valve.
3. The pilot valve performance testing device of claim 1, wherein a sealing disk is tightly arranged between the pressure test stand and the test seat, and sealing rings are arranged between the upper surface of the sealing disk and the test seat and between the lower surface of the sealing disk and the pressure test stand.
4. The pilot valve performance testing apparatus of claim 1, wherein the inlet tube is a flexible tube.
5. The pilot valve performance testing apparatus of claim 1, wherein the support is L-shaped and is attached to the upper end of the test socket at a peripheral location.
6. The pilot valve performance testing apparatus of claim 5, wherein the connecting base has a plurality of inner slide holes disposed therein, the inner slide holes are adapted to receive inner piston rods, the inner piston rods have positioning collars at one end thereof and pushing heads at the other end thereof, positioning springs are disposed between the pushing heads and the outer surface of the connecting base, the positioning collars are abutted against the inner surface of the connecting base, axially slidable adjusting rings are disposed in the rotating rings, the adjusting rings are connected to the telescopic rods of the adjusting piston cylinders, a plurality of arcuate pushing guide bars are disposed on the end surfaces of the adjusting rings facing the inner piston rods, the end surfaces of the pushing guide bars are inclined from one end to the other end, the rotating rings drive the adjusting rings to rotate synchronously, and the pushing guide bars rotate together with the adjusting rings to cause the end surfaces of the pushing guide bars to slide over the pushing heads on the inner piston rods to push the inner piston rods toward the gas storage chambers.
7. The pilot valve performance testing apparatus as defined in claim 5, wherein the connecting base is provided with a mounting hole adapted to receive a booster piston post, the cross-sectional area of the outer piston rod and the cross-sectional area of the inner piston rod are smaller than the cross-sectional area of the booster piston post, one end of the booster piston post is connected to a positioning collar, the other end of the booster piston post is connected to a telescopic rod of the booster piston post, and the positioning collar abuts against the inner surface of the connecting base.
8. A pilot valve performance test method is characterized in that the pilot valve performance test device of claim 7 is used for testing, and comprises the following steps: a. installing a pilot valve to be tested on a support, connecting an air inlet pipe between an air inlet of the pilot valve and a pressure sampling joint, and communicating an air outlet pipe between an air outlet of the pilot valve and a ventilation cavity; b. the pressure test table supplies air into the air storage cavity through the air supply pipe, so that the pressure in the air storage cavity is slightly lower than the setting pressure of the pilot valve, and the pressure test table stops supplying air into the air storage cavity; c, rotating the rotating ring, pushing the end face of the pushing bar to slide through the abutting joint head on the outer piston rod to push the outer piston rod to the gas storage cavity, returning the outer piston rod under the action of the abutting spring, so that fluctuating air pressure is generated in the gas storage cavity, and simulating the working condition of fluctuating air pressure, so that even if the instantaneous pressure of the tempering type pilot valve is higher than the setting pressure of the pilot valve, the pilot valve cannot be quickly opened for exhausting; the pilot valve can be quickly opened to exhaust when the instantaneous pressure of the sudden opening type pilot valve is higher than the setting pressure of the pilot valve, so that the sudden opening type pilot valve continuously jumps to exhaust due to fluctuating air pressure; d. the rotating ring stops rotating, the boosting piston column is pushed by the boosting piston cylinder to move into the gas storage cavity, the pressure in the gas storage cavity is continuously increased, when the pressure is increased to the setting pressure of the pilot valve, the pilot valve exhausts gas, and the pressure gauge connected to the ventilation cavity detects that the pressure is obviously reduced, which indicates that the pilot valve is opened at the moment; the pilot valve fault is judged when the pilot valve which is regulating the setting pressure cannot be regulated to the specified opening pressure all the time, and the pilot valve which is regulating the setting pressure is judged to be in fault when the specified pressure is not opened; e. after the pilot valve is started, the pressure test table slowly releases pressure, and when the pressure in the vent cavity detected by the pressure gauge is consistent with the air supply pressure of the pressure test table, the pilot valve returns to the seat; if the pilot valve recoil pressure is adjustable, the pressure of the pressure test table is reduced to the target pressure, the recoil pressure of the pilot valve is adjusted, and when the pressure in the ventilation cavity detected by the pressure gauge is consistent with the air supply pressure of the pressure test table, the pilot valve is recoated.
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| CN104949831A (en) * | 2015-07-09 | 2015-09-30 | 成都施泰欧科技有限公司 | Online checking device and methods for pilot valve and main valve of pilot operated safety valve |
| CN204731018U (en) * | 2015-07-09 | 2015-10-28 | 成都施泰欧科技有限公司 | Pilot valve and main valve on-line testing device in pilot operated safety valve |
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2020
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| CN102620017A (en) * | 2012-03-29 | 2012-08-01 | 天正阀门有限公司 | High-pressure electromagnetic pneumatic-control decompression valve |
| CN203275076U (en) * | 2013-05-22 | 2013-11-06 | 深圳市特种设备安全检验研究院 | Set-pressure detecting device of pilot operated safety valve |
| CN104949831A (en) * | 2015-07-09 | 2015-09-30 | 成都施泰欧科技有限公司 | Online checking device and methods for pilot valve and main valve of pilot operated safety valve |
| CN204731018U (en) * | 2015-07-09 | 2015-10-28 | 成都施泰欧科技有限公司 | Pilot valve and main valve on-line testing device in pilot operated safety valve |
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| CN111721525A (en) | 2020-09-29 |
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