Pilot operated safety valve verification clamp, verification system and verification method

Abstract

The invention relates to the technical field of valve verification, and discloses a pilot operated safety valve verification clamp, system and method, and the pilot operated safety valve verification clamp comprises a pedestal, a sliding module and a pressurization module. The sliding module is arranged on the base, the pressurizing module is provided with a first connecting block and a second connecting block, the first connecting block is connected to the base, the second connecting block is used for being connected to a valve to be verified, and the first connecting block and the second connecting block are each internally provided with a plurality of flow channels. When the first connecting block and the second connecting block are in contact, the multiple flow channels in the first connecting block and the second connecting block are in butt joint and communicated with each other, and the valve to be checked is moved through the sliding module, so that the first connecting block and the second connecting block are in contact; therefore, the communication of a plurality of flow channels in the first connecting block and the second connecting block can be completed, thereby saving the installation time of the connecting pipeline, and improving the verification efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of valve calibration, and in particular to a pilot-operated safety valve calibration fixture, a calibration system and a calibration method. Background Art

[0002] Pilot-operated safety valves are mainly used for overpressure protection of pressure vessels and pressure pipelines. They are flexible, reliable and have large displacement. The pilot-operated safety valve adopts a split design of pilot valve and main valve. The pilot valve and the main valve are connected by bolts. When in use, the pilot valve controls the opening and closing of the main valve. Pilot-operated safety valves need to be calibrated regularly. There are two ways to calibrate: offline calibration and online calibration. When performing offline calibration, only the pilot valve needs to be removed and the set pressure of the pilot valve needs to be calibrated.

[0003] Chinese patent document CN210375681U discloses an on-site offline calibration auxiliary device for a pilot-operated safety valve, comprising a calibration bench, which is connected to a valve to be tested via a plurality of high-pressure hoses.

[0004] However, in the above scheme, during the calibration operation, it is necessary to connect high-pressure hoses and pressure detection instruments, etc., and a large number of joints will be used. In conventional operations, it is necessary to install sealing gaskets or wrap raw tape around the joint connection parts, which is cumbersome and prone to leakage. It takes a lot of time to tighten the joints, which is not conducive to improving work efficiency. Summary of the invention In view of this, the present invention provides a pilot-operated safety valve calibration fixture, a calibration system and a calibration method to solve the problem of inconvenient installation and operation of the existing calibration bench.

[0005] In a first aspect, the present invention provides a pilot-operated safety valve calibration fixture, comprising: Base; A sliding module is arranged on the base, the sliding module has a sliding member, a supporting member is arranged on the sliding member, and the supporting member is used to support the valve to be checked; The pressurizing module comprises a first connecting block and a second connecting block, wherein the first connecting block is connected to the base, a plurality of pressure measuring joints are connected to the first connecting block, and the second connecting block is used to be connected to the valve to be calibrated, and the first connecting block and the second connecting block respectively have flow channels therein, and the first connecting block and the second connecting block are connected by docking to connect the internal flow channels.

[0006] The technical solution of the present invention has the following advantages: by connecting the first connecting block to the valve to be calibrated and setting the valve to be calibrated on the sliding module, during calibration, the valve to be calibrated is moved by the sliding module to make the first connecting block and the second connecting block contact, thereby completing the connection of multiple flow channels in the first connecting block and the second connecting block, thereby saving the installation time of the connecting pipeline and improving the calibration efficiency.

[0007] Optionally, the joint surface between the first connection block and the second connection block is a plane. Through the setting of the plane joint surface, multiple flow channels in the first connection block and the second connection block can be connected and connected at the same time; and when it is necessary to adapt to multiple valves of different specifications to be calibrated, it is only necessary to replace the second connection block, and second connection blocks of different specifications can be adapted to the same first connection block through the plane joint surface.

[0008] Optionally, the first connection block and the second connection block are connected by a first fastener, and the second connection block and the valve to be checked are connected by a second fastener. Through the above arrangement, the first connection block and the second connection block are connected by the first fastener, which can improve the sealing effect and connection efficiency when multiple flow channels are connected, and the second connection block and the valve to be checked are connected by the second fastener, which can improve the connection sealing effect and connection efficiency between the multiple flow channels in the second connection block and the flow channel of the valve to be checked.

[0009] Optionally, an operation panel is provided on the base, and a plurality of pressure measuring joints are provided on the external surface of the operation panel, and the pressure measuring joints are connected to the flow channel in the first connection block through a pipeline. The pipeline between the pressure measuring joint and the first connection block can be pre-connected, and the plurality of pressure measuring joints on the operation panel can be used to connect an air source or a signal acquisition module, etc., and can also be pre-connected, thereby saving installation time.

[0010] Optionally, the sliding module comprises: a slide rail and a driving mechanism, a sliding member is slidably arranged on the slide rail, and the driving mechanism is connected to the sliding member and is used to drive the sliding member to slide along the extension direction of the slide rail. Through the above arrangement, the mobility of the valve to be inspected can be improved.

[0011] Optionally, the driving mechanism includes a driving screw and a support seat, the first end of the driving screw is rotatably connected to the sliding member, the second end of the driving screw is threadedly connected to the support seat, the support seat is connected to the base, and the second end of the driving screw is provided with an operating member after passing through the support seat. Through the above arrangement, the accuracy of moving the valve to be checked can be improved.

[0012] Optionally, the support member has an annular step, the annular step is suitable for supporting the bottom end of the valve to be checked, and the circumference of the annular step has at least two symmetrically arranged arc plates extending upward, and the inner arc surface of the arc plate is suitable for surrounding the valve to be checked. Through the above arrangement, the stability of the valve to be checked on the support member can be improved.

[0013] In a second aspect, the present invention further provides a pilot-operated safety valve calibration system, comprising: an air source module, a pressure control module, a signal acquisition module, and a pilot-operated safety valve calibration fixture as described in any one of the above schemes; The air source module is connected to the pilot safety valve inspection fixture through the pressure control module. The signal acquisition module has a signal collector, which is connected to the valve to be inspected. The signal acquisition module has a recording unit for recording the signal of the signal collector.

[0014] The technical solution of the present invention has the following advantages: the recording unit of the signal acquisition module can automatically and in real time record the pressure changes of the valve to be checked during the checking process, so as to obtain the test result more accurately.

[0015] Optionally, the pressure control module has at least two calibration gas interfaces, and the output gas pressures of the two calibration gas interfaces are the same. Through the above configuration, valve calibration can be completed using the two calibration gas interfaces.

[0016] In a third aspect, the present invention further provides a pilot-operated safety valve calibration method, using the pilot-operated safety valve calibration system described in any one of the above schemes, comprising the following steps: Place the valve to be calibrated on the support of the pilot-operated safety valve calibration fixture; Connect the second connection block to the valve to be calibrated; The sliding module is used to drive the valve to be checked to move, so that the second connection block is docked with the first connection block, and the second connection block and the first connection block are connected; The calibration gas is delivered to the valve to be calibrated through the pressure control module, and the pressure of the calibration gas is adjusted through the pressure control module; The pressure change process in the valve to be calibrated is collected and recorded through the signal acquisition module.

[0017] The technical solution of the present invention has the following advantages: by connecting the first connecting block to the valve to be checked and setting the valve to be checked on the sliding module, during the verification, the valve to be checked is moved by the sliding module so that the first connecting block and the second connecting block are in contact, thereby completing the connection of multiple flow channels in the first connecting block and the second connecting block, thereby saving the installation time of the connecting pipeline and improving the verification efficiency; the signal acquisition module is used to automatically record the pressure changes of the valve to be checked in real time during the verification process, so that the inspection result can be obtained more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A three-dimensional diagram of a pilot-operated safety valve inspection fixture according to an embodiment of the present invention; Figure 2 for Figure 1 An exploded view of the pressurized module in Figure 1; Figure 3 for Figure 1 Schematic diagram of installation of the valve to be checked and the second connection block; Figure 4 for Figure 1 A second angle schematic diagram of Figure 5 for Figure 1 A schematic diagram of a sliding module in FIG. Figure 6 This is a working principle diagram of the valve to be checked according to an embodiment of the present invention; Figure 7 A schematic diagram of a pilot-operated safety valve calibration system according to an embodiment of the present invention; Figure 8 for Figure 7 Schematic diagram inside the medium pressure control module; Fig. 9 A schematic diagram of a flow chart of a pilot-operated safety valve calibration system according to an embodiment of the present invention; Fig.10 It is a schematic diagram of the results of the pilot-operated safety valve calibration method according to an embodiment of the present invention.

[0020] Description of reference numerals: 1. Base; 2. Sliding part; 3. Support part; 4. Valve to be checked; 5. First connecting block; 6. Second connecting block; 7. Pressure measuring joint; 8. Joint surface; 9. First fastener; 10. Second fastener; 11. Operating panel; 12. Slide rail; 13. Support seat; 14. Driving screw rod; 15. Operating part; 16. Annular step; 17. Arc plate; 18. Pilot valve; 19. Main valve; 20. Gas source module; 21. Pressure control module; 22. Signal acquisition module; 23. Check gas interface; 24. Reserved port; 25. Quick unloading valve; 26. Slow unloading valve; 27. Inlet regulating valve; 28. Pressure pipeline; 29. ​​Control pipeline; 30. Supply pipeline; 31. Pressure regulating valve. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0022] Combine the following Figures 1 to 10 , describing an embodiment of the present invention.

[0023] like Figure 1 As shown, a specific implementation of the pilot safety valve inspection fixture provided in this embodiment includes: a base 1, a sliding module and a pressurizing module. The sliding module is arranged on the base 1, and the sliding module has a sliding member 2, and a supporting member 3 is arranged on the sliding member 2, and the supporting member 3 is used to support the valve 4 to be inspected.

[0024] It should be noted that, in this embodiment, the support member 3 and the sliding member 2 can be separately arranged, that is, detachably connected. Such an arrangement can facilitate the separate processing and production of each part, and when the valve 4 to be calibrated has different specifications, the applicability of the calibration can be improved by replacing the support member 3. Specifically, the support member 3 and the sliding member 2 can be connected by fasteners, such as bolts; or, the support member 3 and the sliding member 2 can also be connected only by positioning members, such as corresponding positioning holes can be set on the support member 3 and the sliding member 2, and the positioning members can pass through each positioning hole in turn to position the two parts.

[0025] Of course, the above description is not restrictive, and in some alternative embodiments, the support member 3 and the sliding member 2 may also be integrally formed.

[0026] like Figure 1As shown, in this embodiment, a pulley is provided at the bottom of the base 1 to facilitate the movement of the base 1. Of course, the above description is not restrictive. In some alternative embodiments, the bottom of the base 1 can also be provided as other moving mechanisms such as a slide rail. In some embodiments, the bottom of the base 1 can also be fixed.

[0027] like Figure 1 , Figure 2 As shown, in this embodiment, the pressurizing module has a first connecting block 5 and a second connecting block 6, the first connecting block 5 is connected to the base 1, a plurality of pressure measuring joints 7 are connected to the first connecting block 5, the second connecting block 6 is used to be connected to the valve 4 to be checked, the first connecting block 5 and the second connecting block 6 have a plurality of flow channels respectively, and when the first connecting block 5 and the second connecting block 6 are in contact, the plurality of flow channels inside the first connecting block and the second connecting block are respectively connected and connected. That is to say, in this embodiment, the connection of the two connecting blocks is realized by connecting the plurality of flow channels in the connecting blocks, thereby saving the tedious operation of connecting the joints one by one.

[0028] It should be noted that, in this embodiment, the flow passages in the first connection block 5 and the second connection block 6 can be obtained by drilling holes from the outside, and then the redundant openings of the external drilling holes are blocked by plugs.

[0029] Of course, the above description is not restrictive, and in some alternative embodiments, the flow channels in the first connecting block 5 and the second connecting block 6 can also be directly formed by a mold, or the two connecting blocks can be combined and formed by two separate parts.

[0030] In the pilot-operated safety valve calibration fixture provided in the present embodiment, by connecting the first connecting block 5 to the valve 4 to be calibrated, and setting the valve 4 to be calibrated on the sliding module, during calibration, the valve 4 to be calibrated is moved by the sliding module to make the first connecting block 5 and the second connecting block 6 contact, thereby completing the connection of multiple flow channels in the first connecting block 5 and the second connecting block 6, thereby saving the installation time of the connecting pipeline and improving the calibration efficiency.

[0031] like Figure 2 As shown, in the pilot-operated safety valve inspection fixture provided in this embodiment, the joint surface 8 between the first connection block 5 and the second connection block 6 is a plane, and the first connection block 5 and the second connection block 6 are connected by a first fastener 9. Through the setting of the plane joint surface 8, multiple flow channels in the first connection block 5 and the second connection block 6 can be simultaneously connected and connected by the first fastener 9, which can improve the sealing effect and connection efficiency when multiple flow channels are connected.

[0032] It should be noted that, in this embodiment, three flow channels are respectively provided in the first connection block 5 and the second connection block 6, so that three interfaces are respectively provided at the joint surface 8. When the joint surfaces 8 of the first connection block 5 and the second connection block 6 are attached to each other, the three flow channels are respectively connected.

[0033] However, the above description is not restrictive, and in some alternative embodiments, the joint surface 8 of the first connection block 5 and the second connection block 6 may adopt a non-planar structure, for example, a concave-convex surface that can be embedded in each other.

[0034] like Figure 2 As shown, in this embodiment, a positioning structure is further provided at the joint surface 8 of the first connecting block 5 and the second connecting block 6. Specifically, symmetrical positioning holes are provided on the joint surface 8 of the first connecting block 5, and corresponding positioning columns are provided on the joint surface 8 of the second connecting block 6. When the joint surfaces 8 of the first connecting block 5 and the second connecting block 6 are close to each other, the positioning columns are first inserted into the positioning holes, thereby ensuring the accuracy of the mutual docking of the flow channels in the first connecting block 5 and the second connecting block 6.

[0035] like Figure 3 As shown, in the pilot-operated safety valve inspection fixture provided in this embodiment, the second connection block 6 is connected to the valve 4 to be inspected by a second fastener 10. Specifically, the second fastener 10 can be a countersunk bolt, which is inserted from the joint surface 8 of the second fastener 10 toward the valve 4 to be inspected, and then the bolt head is hidden in the joint surface 8, and after passing through the second connection block 6, it is connected to the valve 4 to be inspected through a threaded structure. The outlet of the flow channel in the second connection block 6 is opposite to the outlet of the flow channel on the valve 4 to be inspected, so that when the second connection block 6 is connected to the valve 4 to be inspected, the flow channel in the second connection block 6 can be connected to the flow channel in the valve 4 to be inspected.

[0036] It should be noted that, in this embodiment, the second connection block 6 matches the specifications of the valve to be checked 4. That is, when the specifications of the valve to be checked 4 are larger, the second connection block 6 of larger specifications can be replaced to connect to the valve to be checked 4, thereby realizing the verification of valves to be checked 4 of different specifications. At the same time, since the joint surface 8 of the second connection block 6 of different specifications with the first connection block 5 is a plane, it can be matched with the same first connection block 5 without replacing the first connection block 5.

[0037] like Figure 4As shown, in the pilot-operated safety valve inspection fixture provided in this embodiment, an operating panel 11 is provided on the base 1, and a plurality of pressure measuring joints 7 are provided on the external leakage surface of the operating panel 11, and the pressure measuring joints 7 are communicated with the flow channel in the first connection block 5 through a pipeline. Through the above-mentioned configuration, the pressure measuring joints 7 are provided on the external leakage surface of the operating panel 11, which can improve the convenience of connection with the external pipeline, wherein the pipeline between the pressure measuring joint 7 and the first connection block 5 can be pre-connected, and the plurality of pressure measuring joints 7 on the operating panel 11 can be used to connect the gas source or the signal acquisition module 22, etc., and can also be pre-connected, thereby saving installation time.

[0038] like Figure 5 As shown, in the pilot-operated safety valve inspection fixture provided in this embodiment, the sliding module includes: a slide rail 12 and a driving mechanism, a slide member 2 is slidably provided on the slide rail 12, and the driving mechanism is connected to the slide member 2 and is used to drive the slide member 2 to slide along the extension direction of the slide rail 12. Specifically, the extension direction of the slide rail 12 is toward the first connecting block 5. When in use, the driving mechanism drives the slide member 2, so that the support member 3 on the slide member 2 drives the valve 4 to be inspected to move toward the first connecting block 5, so that the second connecting block 6 on the valve 4 to be inspected is docked and connected with the joint surface 8 of the first connecting block 5.

[0039] like Figure 5 As shown, in this embodiment, the driving mechanism includes a driving screw 14 and a support seat 13, the first end of the driving screw 14 is rotatably connected to the sliding member 2, the second end of the driving screw 14 is threadedly connected to the support seat 13, the support seat 13 is connected to the base 1, and the second end of the driving screw 14 is provided with an operating member 15 after passing through the support seat 13. Specifically, the extension direction of the driving screw 14 is consistent with that of the slide rail 12, the operating member 15 can be an operating hand wheel, and a ball bearing can be used to connect one end of the driving screw 14 to the sliding member 2. When in use, the driving screw 14 is rotated by the operating member 15, so that the driving screw 14 moves along its own axis relative to the support seat 13, thereby driving the sliding member 2 to move along the bottom slide rail 12. With such a configuration, the system connection can be completed by simple on-site operation.

[0040] Of course, the above description is not restrictive, and in some alternative embodiments, the driving mechanism may adopt other conventional methods, for example, an oil cylinder, a pneumatic cylinder or an electric push rod.

[0041] like Figure 5As shown, in the pilot-operated safety valve inspection fixture provided in this embodiment, the support member 3 has an annular step 16, and the annular step 16 is suitable for supporting the bottom end of the valve 4 to be inspected. The circumference of the annular step 16 has at least two symmetrically arranged arc plates 17 extending upward, and the inner arc surface of the arc plate 17 is suitable for surrounding the valve 4 to be inspected. Through the above arrangement, the valve 4 to be inspected can be vertically arranged on the support member 3 with the bottom downward, thereby simulating the application environment of the valve 4 to be inspected and ensuring the experimental effect. At the same time, through the above, after disassembling the valve 4 to be inspected, it can be more conveniently set on the support member 3, avoiding operations such as flipping the valve 4 to be inspected, and improving the convenience of operation.

[0042] Working principle: The pilot-operated safety valve inspection fixture provided in the present embodiment is used by first hoisting the valve 4 to be inspected onto the support 3 by a hoisting machine, and then installing the second connecting block 6 onto the valve 4 to be inspected by means of the second fastener 10. Finally, the valve 4 to be inspected is moved toward the first connecting block 5 by means of the operating member 15, so that the second connecting block 6 fits the sealing surface of the first connecting block 5, and then the first connecting block 5 and the second connecting block 6 are fastened and connected by means of the first fastener 9, thereby completing the installation of the valve 4 to be inspected.

[0043] On the other hand, an embodiment of the present invention further provides a pilot-operated safety valve calibration system, comprising: an air source module 20, a pressure control module 21, a signal acquisition module 22 and the pilot-operated safety valve calibration fixture described in the above scheme.

[0044] like Figure 6 As shown, the pilot safety valve is also called a pilot valve 18. When in use, the pilot valve 18 is connected to the main valve 19 through a pipeline. The pilot valve 18 is connected to the medium in front of the main valve 19, and controls the action of the main valve 19 according to the medium pressure. When the medium pressure in front of the main valve 19 exceeds the preset pressure, the pilot valve 18 can open the main valve 19 in time to ensure the safety of the pipeline. As is known to all, there is a valve core in the pilot valve 18, and a pressure chamber is provided on both sides of the valve core. The two pressure chambers drive the piston by utilizing the upper and lower area difference of the piston. Specifically, when the pressure values ​​in the two pressure chambers reach the set pressure, the valve core will be driven to move, so that one of the pressure chambers is depressurized, and the pressure in the other pressure chamber is transmitted toward the main valve 19, thereby driving the main valve 19 to open. Since the specific working principle of the pilot safety valve is well known in the art, it will not be described here.

[0045] like Figure 7As shown, in the pilot safety valve inspection system provided in this embodiment, the air source module 20 is connected to the pilot safety valve inspection fixture through the pressure control module 21, the signal acquisition module 22 has a signal collector, the signal collector is connected to the valve 4 to be inspected, and the signal acquisition module 22 has a recording unit for recording the signal of the signal collector. When in use, the pressure change of the valve 4 to be inspected during the inspection process can be automatically recorded in real time by the recording unit of the signal acquisition module 22, so as to obtain the inspection result more accurately. Specifically, the air source module 20 includes: a inspection air source, a drive air source and an air supply pipeline. The inspection air source provides a high-pressure air source for the inspection pilot valve 18 and is directly connected to the pressure control module 21. The inspection air source can use high-pressure compressed air or high-pressure nitrogen, and the supply of high-pressure air source can be achieved by loading with a gas cylinder. The drive air source provides a driving air source for the starting booster pump and other equipment in the pressure control module 21, so that no additional drive power supply is required.

[0046] like Figure 7 As shown, in this embodiment, in the pressure control module 21, an input pressure display instrument is configured at the pressure input port, and an output pressure display instrument is set after each pressure regulating valve 31. The output pressure display instrument includes a digital pressure display measuring device and a pointer pressure gauge. The accuracy of the digital pressure display measuring device is not less than 0.25 level, and the accuracy of the pointer pressure gauge is not less than 1.6 level. The interfaces of pressure input and output are quick connectors, which can realize rapid disassembly and assembly of inlet and outlet air pipes.

[0047] like Figure 7 As shown, the signal acquisition module 22 is connected to the signal collector through a signal line. There are three signal collectors, the first one is connected to the first pressure chamber of the valve 4 to be checked, the second one is connected to the second pressure chamber of the valve 4 to be checked, and the third one is connected to the outlet channel of the valve 4 to be checked to the main valve 19, so that the pressures of the two pressure chambers in the valve 4 to be checked and the outlet pressure of the valve 4 to be checked can be detected respectively through multiple signal collectors. Specifically, the signal collector can be set on the pipeline leading to the valve 4 to be checked, and the signal collector adopts a pressure sensor. Because the instantaneous pressure of the pilot safety valve changes very quickly when it is tripped, it is necessary to continuously monitor the pressure in the pressure line 28, the control line 29 and the supply line 30. At this time, the pointer-type pressure gauge can no longer meet the requirements of continuous monitoring, so it is necessary to use a pressure sensor with continuous monitoring function.

[0048] like Figure 8As shown, in the pilot-operated safety valve calibration system provided in this embodiment, the pressure control module 21 includes: an air source input interface, a pressure gauge, a pressure regulating valve 31, a fast unloading valve 25, a slow unloading valve 26, an air intake regulating valve 27, a calibration gas interface 23, etc. Specifically, the pressure control and regulation module has a pressure input port and three pressure output ports, and is equipped with two pressure regulating valves 31, one of which controls the output pressure of the two output ports, and the other controls the output pressure of the third output port. The two pressure regulating valves 31 can operate independently and will not interfere with each other. Specifically, the three output ports include two calibration gas interfaces 23 and a reserved port 24, wherein the output gas pressures of the two calibration gas interfaces 23 are the same, and are used to supply gas to the first pressure chamber and the second pressure chamber of the valve 4 to be calibrated, respectively. When the pressure in the second pressure chamber reaches the set pressure, it will be exhausted to the outside. The reserved port 24 can be used for testing other valves 4 to be calibrated that need to be filled with gas.

[0049] In this embodiment, the two modes of fast pressure relief and slow pressure relief are realized by using the fast unloading valve 25 and the slow unloading valve 26 together. The intake pressure can be accurately adjusted by the intake regulating valve 27 to control the change rate of the intake pressure. During the calibration process of the pilot valve 18, when the calibration pressure is close to the set pressure, the pressure increase rate should be controlled, and the pressure increase rate should be controlled within an appropriate range, otherwise the real set pressure value cannot be captured.

[0050] like Fig. 9 As shown, in this embodiment, a first pressure sensor is arranged on the supply line 30 from the pressure control module 21 to the valve 4 to be checked, a second pressure sensor is arranged on the pressure line 28 from the pressure control module 21 to the valve 4 to be checked, and a third pressure sensor is arranged on the control line 29 from the valve 4 to be checked to the signal acquisition module 22. When in use, the set pressure of the pilot safety valve needs to be measured. The set pressure is defined as the system pressure corresponding to when the valve core and the valve seat are about to separate. When performing the set pressure test, the pressure line 28 and the supply line 30 of the pilot valve 18 should simultaneously input the medium of the same working pressure to simulate the actual tripping of the pilot valve 18. As the input system medium pressure gradually approaches the set pressure of the pilot valve 18, the valve core and the valve seat gradually begin to separate. At the moment of separation, the valve seat and the valve core fit together, blocking the input channel from the supply line 30 to the control line 29, and the channel between the valve seat and the valve core is opened, and the pressure of the control line 29 will be discharged from the channel.

[0051] like Fig.10 As shown, from the perspective of pressure change, the pressure P2 in the control line 29 will drop instantaneously at this time, and the pressure of the pressure-conducting line 28 corresponding to the point of instantaneous drop is the set pressure Ps of the pilot safety valve.

[0052] This embodiment provides a pilot-operated safety valve calibration method, which uses the pilot-operated safety valve calibration system described in the above solution, including the following steps: First, place the valve 4 to be inspected on the support 3 of the pilot-operated safety valve inspection fixture; Then, connect the second connection block 6 to the valve 4 to be checked. Figure 2 , Figure 3 As shown, the three small-diameter circular holes on the second connecting block 6 correspond to the supply pipeline 30, the pressure-leading pipeline 28 and the control pipeline 29 respectively.

[0053] Then, the valve to be checked 4 is driven to move by the sliding module, so that the second connection block 6 is docked with the first connection block 5, and the second connection block 6 and the first connection block 5 are connected; Then, the calibration gas is delivered to the valve 4 to be calibrated through the pressure control module 21, and the pressure of the calibration gas is adjusted through the pressure control module 21; specifically, the pressure-guiding pipeline 28 and the supply pipeline 30 are inflated by tightening the pressure regulating valve 31 on the pressure control module 21.

[0054] Then, the pressure change process in the valve 4 to be checked is collected and recorded by the signal acquisition module 22. Since the pressures in the three pressure lines, namely the pressure line 28, the supply line 30 and the control line 29, are monitored simultaneously, the pressures in the three pressure lines need to be compared and observed, so it is necessary to configure a data analysis and graphic display device, which is convenient for real-time collection and reading of pressure signals, and the graphic display device can display the curve of pressure changes in real time. Specifically, the pressure in the three pipelines is monitored by a pressure sensor, the signal acquisition module 22 collects the pressure signal, and displays the real-time change curve of the pressure on the graphic display device.

[0055] It should be noted that the instantaneous pressure change of the pilot-operated safety valve when it takes off is very fast, and the signal acquisition frequency of the pressure signal acquisition device should not be too low. Specifically, the acquisition frequency of the pressure signal should not be lower than 1000Hz, otherwise it is impossible to collect real and effective data. Therefore, a high-frequency acquisition device is required.

[0056] like Fig.10 As shown, in the above steps, when the pressure is increased to 90% of the set pressure, the pressure increase rate needs to be reduced, and the pressure increase rate is controlled within the range of (0.03-0.13) bar / s. The gas flow rate can be accurately adjusted by the air intake regulating valve 27 to ensure that the pressure increase rate is controlled within the specified range.

[0057] In the above steps, if Fig.10As shown, when the pressure P2 of the control line 29 suddenly drops, the pressure curves of the control line 29 and the pressure supply line 28 begin to separate, and the pressure P1 of the pressure supply line 28 continues to rise for a period of time, and the final value is controlled within 1.1 times the set pressure Ps value, and then the pressure of the pressure supply line 28 is reduced by loosening the slow unloading valve 26. The rate of pressure reduction should also be controlled within the range of (0.03-0.13) bar / s, and the pressure gradually decreases. When the inflection point of the pressure rise of the control line 29 appears, the pressure in the entire process pipeline can be completely released by opening the fast unloading valve 25.

[0058] like Fig.10 As shown, the method for reading the set pressure value is to find the separation point of the control pipeline 29 and the pressure-leading pipeline 28, and read the pressure corresponding to the separation point, which is the set pressure value of the pilot-operated safety valve.

[0059] Perform three pressure tests according to the above steps and take the average of the three pressures as the final set pressure value. The set pressure value should be within the specified deviation range. If it exceeds the specified deviation range, relevant operations for set pressure adjustment should be performed.

[0060] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the present invention.

Claims

1. A pilot operated safety valve calibration fixture, characterized in that: include: Base (1); A sliding module is arranged on the base (1), the sliding module comprises a sliding member (2), a supporting member (3) is arranged on the sliding member (2), and the supporting member (3) is used to support the valve (4) to be checked; The pressurizing module comprises a first connecting block (5) and a second connecting block (6), wherein the first connecting block (5) is connected to the base (1), a plurality of pressure measuring joints (7) are connected to the first connecting block (5), and the second connecting block (6) is used to be connected to the valve to be calibrated (4), wherein the first connecting block (5) and the second connecting block (6) respectively have a plurality of flow channels therein, and when the first connecting block (5) and the second connecting block (6) are in contact, the plurality of flow channels inside the first connecting block and the second connecting block are respectively connected and communicated.

2. The pilot operated safety valve inspection fixture according to claim 1, characterized in that: The joining surface (8) between the first connecting block (5) and the second connecting block (6) is a plane.

3. The pilot operated safety valve test fixture according to claim 2, characterized in that: The first connection block (5) and the second connection block (6) are connected via a first fastener (9), and the second connection block (6) and the valve to be calibrated (4) are connected via a second fastener (10).

4. The pilot operated safety valve inspection fixture according to any one of claims 1 to 3, characterized in that: An operating panel (11) is provided on the base (1), and a plurality of pressure measuring joints (7) are provided on the external surface of the operating panel (11). The pressure measuring joints (7) are connected to the flow channel in the first connecting block (5) through a pipeline.

5. The pilot operated safety valve inspection fixture according to any one of claims 1 to 3, characterized in that: The sliding module comprises: a sliding rail (12) and a driving mechanism, a sliding member (2) is slidably arranged on the sliding rail (12), and the driving mechanism is connected to the sliding member (2) and is used to drive the sliding member (2) to slide along the extension direction of the sliding rail (12).

6. The pilot operated safety valve test fixture according to claim 5, characterized in that: The driving mechanism comprises a driving screw rod (14) and a support seat (13); a first end of the driving screw rod (14) is rotatably connected to the sliding member (2); a second end of the driving screw rod (14) is threadedly connected to the support seat (13); the support seat (13) is connected to the base (1); and an operating member (15) is provided after the second end of the driving screw rod (14) passes through the support seat (13).

7. The pilot operated safety valve inspection fixture according to any one of claims 1 to 3, characterized in that: The support member (3) has an annular step (16), the annular step (16) being suitable for supporting the bottom end of the valve to be checked (4), and the annular step (16) having at least two symmetrically arranged arc plates (17) extending upwards around the circumference, the inner arc surface of the arc plate (17) being suitable for surrounding the valve to be checked (4).

8. A pilot operated safety valve calibration system, characterized in that: include: An air source module (20), a pressure control module (21), a signal acquisition module (22), and a pilot-operated safety valve calibration fixture according to any one of claims 1 to 7; The air source module (20) is connected to the pilot-operated safety valve calibration fixture via the pressure control module (21); the signal acquisition module (22) comprises a signal collector, the signal collector is connected to the valve to be calibrated (4); and the signal acquisition module (22) comprises a recording unit for recording a signal from the signal collector.

9. The pilot operated safety valve calibration system according to claim 8, characterized in that: The pressure control module (21) has at least two calibration gas interfaces (23), and the output gas pressures of the two calibration gas interfaces (23) are the same.

10. A pilot operated safety valve calibration method, characterized in that: The pilot operated safety valve calibration system according to claim 8 or 9 comprises the following steps: Place the valve to be inspected (4) on the support (3) of the pilot-operated safety valve inspection fixture; Connecting a second connection block (6) to the valve to be calibrated (4); The valve to be checked (4) is driven to move by the sliding module, so that the second connection block (6) is docked with the first connection block (5), thereby connecting the second connection block (6) and the first connection block (5); delivering a calibration gas to the valve to be calibrated (4) via a pressure control module (21), and adjusting the pressure of the calibration gas via the pressure control module (21); The pressure change process in the valve to be calibrated (4) is collected and recorded by the signal collection module (22).

Images