Pilot operated safety valve action performance test system and device thereof

Abstract

The invention relates to the technical field of pilot operated safety valves, in particular to a pilot operated safety valve action performance test system and a device thereof.The pilot operated safety valve action performance test system comprises a main valve and a pilot valve, an inlet cavity of the main valve is connected with an external steam source, and the inlet cavity of the main valve is connected with a pilot valve lower cavity of the pilot valve; the air chamber cavity of the main valve is connected with the pilot valve upper cavity of the pilot valve, the flow reducer is arranged at the end of the outlet cavity of the main valve, the flow reducer is used for limiting discharge of the outlet cavity of the main valve, the exhaust efficiency can be reduced, the fault phenomena such as frequency hopping or fluttering are avoided, and meanwhile due to the fact that after flow limiting, the flow reducer can be used for reducing the discharge pressure of the main valve. The exhaust efficiency is reduced, the requirement for the air pressure of an external steam source is reduced, the pressure stability in the test process is improved, and it is guaranteed that the device can normally act in the test process.

Description

Technical Field

[0001] The invention relates to the technical field of pilot-operated safety valves, in particular to a pilot-operated safety valve action performance test system and a device thereof. Background Art

[0002] A safety valve is a reclosable overpressure protection device that can discharge the rated flow of fluid using the pressure of the medium itself, thereby releasing part of the pressure in pressure-bearing devices and equipment such as pressure vessels, pressure pipes or boilers, preventing damage to the system or equipment due to overpressure, and ensuring the normal operation of the device and equipment and the safety of operators.

[0003] The pilot-operated safety valve is a safety valve composed of a main valve and a pilot valve. The pilot valve controls the action of the main valve. It has the advantages of high set pressure, large displacement, reliable sealing and no back pressure. With the development of the economy and the improvement of industrial level, the required discharge volume of the safety valve is getting larger and larger, and the set pressure is also getting higher and higher. The pilot-operated safety valve has been more and more widely used.

[0004] When using conventional pilot-operated safety valve performance test methods to conduct steam tests, on the one hand, the safety valve cannot function normally because the pressure on the steam test bench cannot reach the valve setting pressure. On the other hand, since the displacement of the safety valve is much larger than the flow rate on the steam test bench, that is, the valve's pressure relief capacity is much larger than the overpressure condition, the safety valve will experience frequency jumps and flutter. The above two reasons make it impossible to conduct performance steam tests on high-pressure and large-displacement pilot-operated safety valves.

[0005] Therefore, a pilot operated safety valve action performance test system and device are proposed. Summary of the invention

[0006] In view of the problems in the above or prior art that the pressure of the steam test bench cannot reach the valve setting pressure, resulting in the safety valve being unable to operate normally, and the displacement of the safety valve being much larger than the flow of the steam test bench, that is, the pressure relief capacity of the valve is much larger than the overpressure condition, which will cause the safety valve to experience frequency jumping and flutter, the present invention is proposed.

[0007] Therefore, an object of the present invention is to provide a pilot-operated safety valve operating performance test system.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: a pilot-operated safety valve action performance test system, comprising a main valve and a pilot valve, wherein the inlet chamber of the main valve is connected to an external steam gas source, the inlet chamber of the main valve is connected to the pilot valve lower cavity of the pilot valve, the air chamber cavity of the main valve is connected to the pilot valve upper cavity of the pilot valve, and a flow reducer is provided at the end of the outlet chamber of the main valve.

[0009] As a preferred solution of the pilot-operated safety valve action performance test system of the present invention, it further comprises an external compressed air source, wherein the outlet end of the external compressed air source is connected to a first needle valve;

[0010] The inlet cavity of the main valve is connected to a No. 1 pipeline, the end of the No. 1 pipeline is connected to a second needle valve, and the pilot valve lower cavity of the pilot valve is connected to a No. 2 pipeline;

[0011] The first needle valve is connected to the second needle valve and pipeline No. 2, and the second needle valve is connected to pipeline No. 2;

[0012] A No. 3 pipeline is arranged between the air chamber cavity of the main valve and the pilot valve upper cavity of the pilot valve.

[0013] As a preferred solution of the pilot-operated safety valve action performance test system of the present invention, wherein: a first control valve and a first pressure regulating valve are sequentially connected between the external compressed air source and the first needle valve;

[0014] A second control valve and a second pressure regulating valve are connected in sequence between the external steam source and the inlet chamber of the main valve.

[0015] As a preferred solution of the pilot-operated safety valve action performance test system of the present invention, the inlet chamber of the main valve is connected to a first drain valve, the outlet chamber of the main valve is connected to a second drain valve, and an exhaust valve is provided between the first pressure regulating valve and the first needle valve.

[0016] As a preferred solution of the pilot-operated safety valve action performance test system of the present invention, a first pressure sensor is provided between the first needle valve and the first pressure regulating valve, a second pressure sensor is provided at the inlet cavity of the main valve, a third pressure sensor is connected to the air chamber cavity of the main valve, and a fourth pressure sensor is provided on the flow reducer.

[0017] The beneficial effects of the pilot-operated safety valve action performance test system of the present invention: the present invention limits the discharge of the outlet mouth of the main valve through a flow reducer, which can reduce the exhaust efficiency and avoid fault phenomena such as frequency jumping or flutter. At the same time, since the exhaust efficiency is reduced after the flow is limited, the air pressure requirement for the external steam source is reduced, which improves the stability of the pressure during the test and ensures that the invention can operate normally during the test.

[0018] In order to solve the above technical problems, the present invention also provides the following technical solutions: a flow reducer, applied to the pilot safety valve action performance test system, comprising:

[0019] An exhaust mechanism, comprising a mounting plate, an output pipeline disposed on the mounting plate, and a flow controller disposed in the output pipeline;

[0020] A pressure regulating mechanism, comprising a supporting sleeve arranged on the mounting plate, and a fixed sleeve arranged on the outer wall of the output pipeline, and also comprising a piston rod slidably arranged in the supporting sleeve and the fixed sleeve, wherein a spring is arranged in the fixed sleeve;

[0021] The flow controller includes a valve seat arranged on the output pipeline, and a valve core rotatably arranged in the valve seat, and also includes a rotating shaft arranged on the valve core, and an adjusting gear is arranged at the end of the rotating shaft;

[0022] The outer wall of the piston rod is provided with an annular tooth groove.

[0023] As a preferred solution of the flow reducer of the present invention, wherein: a receiving chamber is provided in the piston rod;

[0024] It also includes a pushing mechanism, which includes a pushing bar slidably arranged in the accommodating cavity, and a pushing groove arranged on the pushing bar, the pushing bar is provided with a spring sheet, and also includes a connecting rod rotatably arranged on the pushing bar.

[0025] As a preferred solution of the flow reducer of the present invention, the outer wall of the piston rod is provided with a receiving groove.

[0026] As a preferred solution of the flow reducer of the present invention, wherein: the outer wall of the piston rod is provided with a rotation groove;

[0027] It also includes a locking mechanism, which includes a resistance ring rotatably arranged in the rotating groove, a resistance plate arranged on the resistance ring, and a limit ring arranged at the end of the resistance plate.

[0028] As a preferred solution of the flow reducer of the present invention, a groove is provided on the abutment ring.

[0029] The beneficial effects of the flow reducer of the present invention are as follows: due to the presence of the flow reducer, the gas will be discharged from the flow controller. As the pressure increases, the opening of the flow controller increases. When the air pressure decreases, the piston rod resets, which will reduce the opening of the flow controller and reduce the leakage. While reducing the flow discharge, the flow stability can be guaranteed as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1It is the overall structural diagram of the pilot-operated safety valve action performance test system.

[0032] Figure 2 Schematic diagram of the overall structure of the flow reducer.

[0033] Figure 3 A side view of the flow reducer.

[0034] Figure 4 for Figure 3 Cross-section view at AA in the middle.

[0035] Figure 5 for Figure 3 Cross-section view at BB.

[0036] Figure 6 It is a schematic diagram of the structure of the locking mechanism and the pushing mechanism of the flow reducer.

[0037] Figure 7 It is a schematic diagram of the connection structure between the receiving groove and the contact plate of the flow reducer.

[0038] Figure 8 It is a schematic diagram of the structure of the flow reducer when the regulating gear and the contact plate are in the contact state.

[0039] In the figure:

[0040] 100, exhaust mechanism; 101, mounting plate; 102, output pipeline; 103, flow controller;

[0041] 103a, valve seat; 103b, valve core; 103c, rotating shaft; 103d, adjusting gear;

[0042] 200, pressure regulating mechanism; 201, supporting sleeve; 202, fixed sleeve; 203, piston rod; 203a, annular tooth groove; 203b, accommodating chamber; 203c, rotating groove; 203d, accommodating groove;

[0043] 204, spring;

[0044] 300, locking mechanism; 301, resistance ring; 302, resistance plate; 303, limit ring; 304, groove; 400, pushing mechanism; 401, pushing bar; 402, pushing groove; 403, spring piece; 404, connecting rod. DETAILED DESCRIPTION

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0046] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0047] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0048] Example 1, reference Figure 1 , is the first embodiment of the present invention, which provides a pilot-operated safety valve action performance test system, including a main valve and a pilot valve, the inlet cavity of the main valve is connected to an external steam gas source, the inlet cavity of the main valve is connected to the pilot valve lower cavity of the pilot valve, the air chamber cavity of the main valve is connected to the pilot valve upper cavity of the pilot valve, and a flow reducer is provided at the end of the outlet cavity of the main valve.

[0049] In this embodiment, the discharge of the outlet of the main valve is limited by a flow reducer, which can reduce the exhaust efficiency and avoid fault phenomena such as frequency jumping or flutter. At the same time, since the exhaust efficiency is reduced after the flow is limited, the air pressure requirement for the external steam source is reduced, which improves the pressure stability during the test and ensures that the invention can operate normally during the test.

[0050] Specifically, it also includes an external air source for compressed air, the air outlet end of the external air source for compressed air is connected to a first needle valve; the inlet cavity of the main valve is connected to pipeline No. 1, the end of pipeline No. 1 is connected to a second needle valve, and the lower cavity of the pilot valve of the pilot valve is connected to pipeline No. 2; the first needle valve is connected to the second needle valve and pipeline No. 2, and the second needle valve is connected to pipeline No. 2; a No. 3 pipeline is arranged between the air chamber cavity of the main valve and the upper cavity of the pilot valve of the pilot valve.

[0051] In this embodiment, the setting of the first needle valve and the second needle valve can facilitate the control of the connection between the gas circuits. After adding the external gas source of compressed air, the second needle valve can be closed and the first needle valve can be opened. The external gas source of compressed air can be used for pressurization to open the pilot valve, which further reduces the requirements for the gas source. At the same time, after the main valve is opened, the pilot valve will not be automatically closed due to the opening of the main valve, which is convenient for identifying and judging the action of the valve.

[0052] Furthermore, a first control valve and a first pressure regulating valve are connected in sequence between the external gas source of compressed air and the first needle valve; a second control valve and a second pressure regulating valve are connected in sequence between the external gas source of steam and the inlet of the main valve. In this embodiment, the first control valve, the first pressure regulating valve, the second control valve and the second pressure regulating valve can adjust the pressure of the gas and control the flow rate of the gas.

[0053] Among them, the inlet chamber of the main valve is connected to the first drain valve, the outlet chamber of the main valve is connected to the second drain valve, and an exhaust valve is provided between the first pressure regulating valve and the first needle valve. In this embodiment, after the experiment is completed, the retained water in the system can be discharged through the first drain valve and the second drain valve, and the exhaust valve can discharge the retained gas, and the residual medium pressure in the pipeline can be released after the test.

[0054] Preferably, a first pressure sensor is provided between the first needle valve and the first pressure regulating valve, a second pressure sensor is provided at the inlet cavity of the main valve, a third pressure sensor is connected to the air chamber cavity of the main valve, and a fourth pressure sensor is provided on the flow reducer. In this embodiment, through the setting of various pressure sensors, the air pressure at various parts can be detected, and by judging the air pressure, it is convenient for testers to identify and judge the action of the valve.

[0055] It should be noted that the first needle valve is opened during the test to connect the pilot valve inlet to the external air source. The second needle valve is closed during the test to cut off the connection between the main valve inlet and the pilot valve inlet. At this time, by increasing the pressure of the compressed air external air source, the pressure in the lower cavity of the pilot valve can reach the valve setting pressure, the pilot valve is actuated, and then the main valve is actuated.

[0056] The specific operations are as follows:

[0057] In the first step, high-temperature steam is introduced into the main valve inlet cavity. First, the second control valve is opened to connect the pipeline between the main valve inlet cavity and the steam external gas source, and the second pressure regulating valve is adjusted until the medium pressure of the main valve inlet reaches the set pressure within the range that the steam test bench can provide. The medium pressure of the main valve inlet is monitored by the second pressure sensor, the pressure of the main valve outlet cavity is monitored by the fourth pressure sensor, and the pressure of the main valve air chamber cavity is monitored by the third pressure sensor.

[0058] In the second step, high-pressure air is introduced into the pilot valve inlet until the pilot valve opens, and the second needle valve is closed to cut off the connection between the main valve inlet and the pilot valve inlet. The first needle valve and the first control valve are opened in sequence to connect the pipeline between the pilot valve inlet and the external compressed air source, and the first pressure regulating valve is adjusted. The air medium pressure at the pilot valve inlet rises until the pilot valve opens. The pilot valve discharges the medium in the air chamber of the main valve, causing the air chamber cavity pressure to decrease, thereby driving the main valve to open. The medium pressure at the pilot valve inlet is monitored by the first pressure sensor.

[0059] Step 3: Reduce the pilot valve inlet pressure until the pilot valve is closed, adjust the first pressure regulating valve, reduce the pilot valve inlet air medium pressure until the pilot valve is closed, and the external high-pressure air enters the main valve air chamber through the pilot valve, pipeline No. 2, and pipeline No. 3, causing the air chamber pressure to rise, thereby driving the main valve to close, and then close the first control valve, cut off the pipeline between the pilot valve inlet and the external air source of compressed air, close the second control valve, cut off the pipeline between the main valve inlet and the external air source of steam, open the exhaust valve, and release the high-pressure gas. Finally, open the first drain valve and the second drain valve to release the residual water after the steam is liquefied. Monitor the pilot valve inlet medium pressure through the first pressure sensor.

[0060] Step 4. Record the valve set pressure and return pressure: When the pressure in the main valve air chamber cavity begins to drop, it means that the pilot valve opens to release the medium pressure in the main valve air chamber cavity. At this time, the medium pressure in the pilot valve inlet can be regarded as the valve set pressure. When the pressure in the main valve air chamber cavity rises, it means that the pilot valve returns to its seat and the medium in the main valve air chamber cavity increases. At this time, the medium pressure in the pilot valve inlet can be regarded as the valve return pressure.

[0061] Step 5: After the test is completed, shut down the system and end the test.

[0062] Example 2, reference Figure 2 to Figure 8 , which is the second embodiment of the present invention. Different from the previous embodiment, this embodiment provides a flow reducer for a pilot-operated safety valve action performance test system, which is applied to the pilot-operated safety valve action performance test system, including an exhaust mechanism 100, which includes a mounting disk 101, and an output pipeline 102 arranged on the mounting disk 101, and also includes a flow controller 103 arranged in the output pipeline 102; in this embodiment, the flow controller 103 can control the exhaust flow of the output pipeline 102.

[0063] The pressure regulating mechanism 200 includes a supporting sleeve 201 arranged on the mounting plate 101, and a fixed sleeve 202 arranged on the outer wall of the output pipeline 102, and also includes a piston rod 203 slidably arranged in the supporting sleeve 201 and the fixed sleeve 202, and a spring 204 is arranged in the fixed sleeve 202; in this embodiment, the elastic force of the spring 204 can push the piston rod 203 to have a movement tendency toward the mounting plate 101.

[0064] The flow controller 103 includes a valve seat 103a arranged on the output pipeline 102, and a valve core 103b rotatably arranged in the valve seat 103a, and also includes a rotating shaft 103c arranged on the valve core 103b, and an adjusting gear 103d is arranged at the end of the rotating shaft 103c; the outer wall of the piston rod 203 is provided with an annular groove 203a. In this embodiment, the valve core 103b can be rotated in the valve seat 103a by rotating the rotating shaft 103c. After the valve core 103b is rotated, the size of the flow discharge can be adjusted, and the adjusting gear 103d can engage with the annular groove 203a.

[0065] During use, after the main valve is actuated, the gas is discharged through the outlet cavity. Due to the presence of the flow reducer, the gas will be discharged from the flow controller 103. In order to improve the flow limiting effect, the flow controller 103 can be closed in the initial state. Due to the action of the main valve, the air pressure inside the outlet cavity is increased, so the pressure can push the piston rod 203 to compress the spring 204. When the piston rod 203 slides, it can drive the adjusting gear 103d to rotate through the annular tooth groove 203a, and then as the pressure increases, the opening of the flow controller 103 is increased, and the discharge efficiency is improved as the pressure increases. When the air pressure decreases, The pressure on the piston rod 203 is reduced, and under the elastic force of the spring 204, the piston rod 203 is reset, which will reduce the opening of the flow controller 103 and reduce the leakage. While reducing the flow discharge, it can also ensure the stability of the flow as much as possible. In addition, due to the installation of the flow reducer, if the flow controller 103 is in a closed state in the initial state, when the main valve is actuated, the piston rod 203 can also play a buffering role and reduce the influence of pressure on the action of the main valve. Moreover, due to the existence of the elastic force of the spring 204, the pressure inside the outlet cavity can be maintained. Only when the pressure increases can the flow controller 103 be opened.

[0066] Example 3, reference Figure 2 to Figure 8 , which is the third embodiment of the present invention. Different from the previous embodiment, a accommodating chamber 203b is provided in the piston rod 203; it also includes a pushing mechanism 400, which includes a pushing bar 401 slidably arranged in the accommodating chamber 203b, and a pushing groove 402 arranged on the pushing bar 401, a spring piece 403 is provided on the pushing bar 401, and also includes a connecting rod 404 rotatably arranged on the pushing bar 401. In this embodiment, two connecting rods 404 are provided, and the two connecting rods 404 are arranged in parallel, and the connecting rod 404 and the piston rod 203 are rotatably connected.

[0067] When the annular tooth groove 203a and the adjusting gear 103d are meshed, the displacement of the piston rod 203 will directly drive the adjusting gear 103d to rotate, and the push groove 402 and the adjusting gear 103d are meshed by rotating the piston rod 203. It should be noted that the length of the push bar 401 is less than the length of the accommodating cavity 203b. Due to the elastic force of the spring sheet 403, the two connecting rods 404 will be vertically arranged with the piston rod 203. At this time, the end of the push bar 401 close to the mounting plate 101 will conflict with the inner wall of the accommodating cavity 203b. Figure 5 In this state, when the piston rod 203 is displaced by pressure, since the end of the push bar 401 close to the mounting plate 101 contacts the inner wall of the accommodating chamber 203b, the piston rod 203 will drive the adjusting gear 103d to rotate when it is displaced in the direction away from the mounting plate 101, thereby increasing the opening of the flow controller 103 and improving the discharge efficiency until the pressure on the piston rod 203 and the discharge efficiency reach a balanced state.

[0068] When the pressure on the end of the piston rod 203 decreases, the spring 204 will push the piston rod 203 to reset. During the reset, due to the meshing of the push groove 402 and the adjusting gear 103d, the push bar 401 will slide into the accommodating chamber 203b after being subjected to the force, the connecting rod 404 will deflect, and the spring piece 403 will be compressed. Therefore, when the piston rod 203 is reset, the valve core 103b will not be driven to rotate, and the opening of the flow controller 103 will not be changed. In this way, the opening of the flow controller 103 can be quickly adjusted to an appropriate size, which is convenient for multiple pilot safety valve action performance tests. At the same time, it can also have over-pressure protection. In subsequent tests, when the pressure in the outlet cavity of the main valve is too high, the opening of the flow controller 103 can still be adaptively increased, which is convenient for the operator to find a suitable flow discharge efficiency.

[0069] Specifically, the outer wall of the piston rod 203 is provided with a receiving groove 203d. In the present embodiment, when the receiving groove 203d is aligned with the adjusting gear 103d, no matter how the piston rod 203 moves at this time, it will not contact the adjusting gear 103d, nor will it change the opening of the flow controller 103. In this state, the operator can rotate the adjusting gear 103d at will, and then control the opening of the flow controller 103 according to his own needs.

[0070] Furthermore, the outer wall of the piston rod 203 is provided with a rotation groove 203c; the locking mechanism 300 is also included, the locking mechanism 300 includes a contact ring 301 rotatably arranged in the rotation groove 203c, and a contact plate 302 arranged on the contact ring 301, and also includes a limit ring 303 arranged at the end of the contact plate 302. In this embodiment, when the contact plate 302 is used to align the adjustment gear 103d, refer to Figure 8, the two outer teeth of the adjusting gear 103d are both in contact with the surface of the abutment plate 302, and the adjusting gear 103d cannot rotate at this time. After the user manually adjusts the opening of the flow controller 103, the piston rod 203 can be rotated until the abutment plate 302 and the adjusting gear 103d are aligned, so as to avoid adjusting the opening of the flow controller 103 during operation. No matter how the piston rod 203 moves, the adjusting gear 103d will not rotate, and the adjusting gear 103d can also be locked to prevent the adjusting gear 103d from rotating.

[0071] The abutment ring 301 is provided with a groove 304. In the present embodiment, the arrangement of the groove 304 can facilitate the sliding of the push bar 401 into the accommodating cavity 203b. When the groove 304 and the push bar 401 are aligned, the push bar 401 can be slid into the accommodating cavity 203b. When the locking mechanism 300 is rotated to misalign the groove 304 and the push bar 401, the push bar 401 cannot slide and the connecting rod 404 cannot deflect. In this way, when the adjusting gear 103d and the push bar 401 are aligned, the movement of the piston rod 203 will drive the adjusting gear 103d to move together. At this time, whether the adjusting gear 103d is engaged with the annular tooth groove 203a or the push groove 402, the effect is the same, and the engageable area of ​​the annular gear 203a is increased. When the opening of the flow controller 103 needs to be changed as the pressure changes, the area of ​​the area is increased, the contact probability is increased, and the stability during operation can be increased.

[0072] The rest of the structure is the same as that of Example 2.

[0073] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A pilot-operated safety valve action performance test system, characterized in that: It includes a main valve and a pilot valve, wherein the inlet cavity of the main valve is connected to an external steam source, the inlet cavity of the main valve is connected to the pilot valve lower cavity of the pilot valve, the air chamber cavity of the main valve is connected to the pilot valve upper cavity of the pilot valve, and a flow reducer is provided at the end of the outlet cavity of the main valve.

2. The pilot operated safety valve operating performance test system according to claim 1, characterized in that: It also includes an external compressed air source, wherein an outlet end of the external compressed air source is connected to a first needle valve; The inlet cavity of the main valve is connected to a No. 1 pipeline, the end of the No. 1 pipeline is connected to a second needle valve, and the pilot valve lower cavity of the pilot valve is connected to a No. 2 pipeline; The first needle valve is connected to the second needle valve and pipeline No. 2, and the second needle valve is connected to pipeline No. 2; A No. 3 pipeline is arranged between the air chamber cavity of the main valve and the pilot valve upper cavity of the pilot valve.

3. The pilot operated safety valve operating performance test system according to claim 2, characterized in that: A first control valve and a first pressure regulating valve are connected in sequence between the external compressed air source and the first needle valve; A second control valve and a second pressure regulating valve are connected in sequence between the external steam source and the inlet chamber of the main valve.

4. The pilot operated safety valve operating performance test system according to claim 3, characterized in that: The inlet chamber of the main valve is connected to a first drain valve, the outlet chamber of the main valve is connected to a second drain valve, and an exhaust valve is provided between the first pressure regulating valve and the first needle valve.

5. The pilot operated safety valve operating performance test system according to claim 3 or 4, characterized in that: A first pressure sensor is provided between the first needle valve and the first pressure regulating valve, a second pressure sensor is provided at the inlet cavity of the main valve, a third pressure sensor is connected to the air chamber cavity of the main valve, and a fourth pressure sensor is provided on the flow reducer.

6. A flow reducer, applied to the pilot-operated safety valve action performance test system according to any one of claims 1 to 5, characterized in that: include, An exhaust mechanism (100) comprises a mounting plate (101), an output pipeline (102) arranged on the mounting plate (101), and a flow controller (103) arranged in the output pipeline (102); A pressure regulating mechanism (200), comprising a supporting sleeve (201) arranged on the mounting plate (101), and a fixed sleeve (202) arranged on the outer wall of the output pipeline (102), and also comprising a piston rod (203) slidably arranged in the supporting sleeve (201) and the fixed sleeve (202), wherein a spring (204) is arranged in the fixed sleeve (202); The flow controller (103) comprises a valve seat (103a) arranged on the output pipeline (102), and a valve core (103b) rotatably arranged in the valve seat (103a), and also comprises a rotating shaft (103c) arranged on the valve core (103b), and an adjusting gear (103d) is arranged at the end of the rotating shaft (103c); The outer wall of the piston rod (203) is provided with an annular tooth groove (203a).

7. The flow reducer according to claim 6, characterized in that: The piston rod (203) is provided with a receiving chamber (203b); The device also includes a pushing mechanism (400), the pushing mechanism (400) including a pushing bar (401) slidably arranged in the accommodating cavity (203b), and a pushing groove (402) arranged on the pushing bar (401), the pushing bar (401) is provided with a spring sheet (403), and also includes a connecting rod (404) rotatably arranged on the pushing bar (401).

8. The flow reducer according to claim 7, characterized in that: The outer wall of the piston rod (203) is provided with a receiving groove (203d).

9. The flow reducer according to claim 8, characterized in that: The outer wall of the piston rod (203) is provided with a rotation groove (203c); It also comprises a locking mechanism (300), the locking mechanism (300) comprising a resistance ring (301) rotatably arranged in the rotating groove (203c), and a resistance plate (302) arranged on the resistance ring (301), and also comprising a limiting ring (303) arranged at the end of the resistance plate (302).

10. The flow reducer according to claim 9, characterized in that: The abutment ring (301) is provided with a groove (304).

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