Pilot operated safety valve water pressure strength test tool and method

Abstract

The invention discloses a pilot operated safety valve water pressure strength test tool and method, belongs to the field of valve test, and aims to solve the problem that the inlet side and the outlet side of a pilot operated safety valve can be separately subjected to water pressure strength test and are easy to operate. The tool comprises a secondary pilot valve sealing cover, the left end face of a sealing ring abuts against the right end face of the secondary valve cover in a sealing mode, the right end of a second connecting rod is connected with the sealing ring in a sealing mode, the left end of the second connecting rod is detachably connected with the secondary pilot valve sealing cover, and the secondary pilot valve sealing cover and the sealing ring are tensioned through the second connecting rod. And the secondary pilot valve sealing cover seals the first pressure relief opening. According to the invention, one side of the medium inlet and one side of the medium outlet can be effectively isolated, and a high-pressure water pressure strength test is carried out on one side of the medium inlet; the water pressure strength test of the low-pressure part on the medium outlet side and the medium inlet side can be carried out together, the use operation of the test tool and the test method are simple, the operation is simple and convenient, and the safety is high.

Description

Technical Field

[0001] The invention belongs to the field of valve testing, and in particular relates to a pilot-operated safety valve water pressure strength testing tool and method. Background Art

[0002] A pilot safety valve with a two-stage pilot valve structure, consisting of a main valve, a primary pilot valve and a secondary pilot valve, is installed on a steam-water separation reheater. It is an overpressure protection device used to prevent the steam pressure in the steam-water separation reheater from exceeding the design pressure due to a turbine accident and damaging related equipment.

[0003] In order to ensure the safety of the pilot safety valve, the water pressure strength test is an important test to verify the safety of the product. It can verify that the valve pressure-bearing parts will not leak or rupture at 1.5 times the design pressure. The pilot safety valve water pressure strength test is divided into the inlet side and outlet side water pressure strength test. The test positions are different and the test pressures are different. The inlet side is the side that maintains pressure when the pilot safety valve is in operation, and the outlet side is the side that discharges pressure after the safety valve takes off. The water pressure strength test pressure on the inlet side is higher than that on the outlet side. When conducting the inlet side water pressure test, the test fixture is required to isolate the inlet side and the outlet side. The design of the test fixture must meet the use requirements while also considering the test method to be simple and easy to operate. Summary of the invention

[0004] The purpose of the present invention is to provide a pilot-operated safety valve water pressure strength test tool to solve the problem that the inlet side and the outlet side of the pilot-operated safety valve can be tested separately and easily. The technical solution adopted by the present invention is as follows:

[0005] A pilot safety valve water pressure strength test tool, the pilot safety valve comprises a main valve body, the main valve body is in a three-way shape, the upper opening, left opening and right opening of the main valve body are connected through a main valve cavity, the main valve cover closes the right opening of the main valve body, the upper opening of the main valve body is a medium inlet, the left opening of the main valve body is a medium outlet, the medium outlet is in a cone tube shape, the valve seat is arranged at the right end of the medium outlet, the right end surface of the valve seat is the main sealing surface of the pilot safety valve, the left end of the secondary pilot valve body penetrates the valve cover, the left end of the secondary pilot valve body is provided with a first pressure relief port, the right end of the secondary pilot valve body is provided with a first back pressure port, the first pressure relief port and the first back pressure port are connected through the secondary pilot valve cavity, the secondary pilot valve cavity is connected to the main valve cavity through the first pressure relief port The secondary pilot valve cavity is connected with the medium outlet through the exhaust pipe, the secondary valve cover closes the first back pressure port, the secondary valve cover is provided with a threaded inner hole, the lower outer wall of the secondary pilot valve body is provided with a primary pilot valve body, the lower end surface of the primary pilot valve body is processed with a primary valve outlet cavity and a primary valve inlet cavity from bottom to top, the medium inlet and the upper end of the primary valve inlet cavity are connected through the air inlet pipe, the seat end of the needle valve body passes through the right side wall of the primary valve outlet cavity, the left end of the needle valve body is provided with a second pressure relief port, the right end of the needle valve body is provided with a second back pressure port, the second back pressure port is provided with an internal thread structure, the second pressure relief port and the second back pressure port are connected through the needle valve cavity, the needle valve cavity is connected with the primary valve outlet cavity through the second pressure relief port, and the test fixture includes:

[0006] A main valve inlet sealing cover, on which a first hydraulic pipe joint is arranged, and the main valve inlet sealing cover is used to block the medium inlet;

[0007] The main valve sealing surface cover, the outer peripheral conical surface of the main valve pressure plate matches the inner peripheral conical surface of the medium outlet, the right end of the first connecting rod is detachably connected to the main valve sealing surface cover, the left end of the first connecting rod is detachably connected to the main valve pressure plate, the main valve sealing surface cover and the main valve pressure plate are tightened by the first connecting rod, and the main valve sealing surface cover blocks the valve seat;

[0008] The secondary pilot valve cover, the left end face of the sealing ring is sealed against the right end face of the secondary valve cover, the right end of the second connecting rod is sealed and connected to the sealing ring, the left end of the second connecting rod is detachably connected to the secondary pilot valve cover, the secondary pilot valve cover and the sealing ring are tightened by the second connecting rod, and the secondary pilot valve cover blocks the first pressure relief port;

[0009] A primary pilot valve plug, wherein the upper end of the primary pilot valve plug blocks the lower end of the primary valve inlet cavity.

[0010] Furthermore, a first sealing groove is provided on the lower end surface of the main valve inlet cover, a first sealing ring is arranged in the first sealing groove, a flange structure is provided at the upper end of the medium inlet, the main valve inlet cover and the flange structure of the medium inlet are connected by bolts, and the main valve inlet cover and the flange structure of the medium inlet are sealed by the first sealing ring.

[0011] Furthermore, a first boss is provided on the left end face of the main valve sealing surface cover, the outer periphery of the first boss matches with the inner periphery of the valve seat, a first threaded blind hole is processed on the left end face of the first boss, the right end of the first connecting rod is threadedly matched with the first threaded blind hole, the left end of the first connecting rod passes through the main valve pressure plate, and is threadedly connected with the first nut, the first nut is pressed against the left end face of the main valve pressure plate, a first sealing gasket is sleeved on the first boss, and the left end face of the main valve sealing surface cover and the right end face of the valve seat are sealed by the first sealing gasket.

[0012] Furthermore, a second boss is provided on the right end face of the secondary pilot valve cover, the outer periphery of the second boss cooperates with the inner periphery of the first pressure relief port, a second sealing gasket is sleeved on the second boss, the right end face of the secondary pilot valve cover and the left end face of the secondary pilot valve body are sealed through the second sealing gasket, a second threaded blind hole is provided on the right end face of the second boss, the left end of the second connecting rod is threadedly cooperated with the second threaded blind hole, the right end of the second connecting rod passes through the secondary valve cover, the sealing ring and the gasket, a second sealing groove is machined on the left end face of the sealing ring, a second sealing ring is provided in the second sealing groove, a third sealing groove is machined on the inner periphery of the sealing ring, a third sealing ring is provided in the second sealing groove, the sealing ring and the second connecting rod are sealed through the third sealing ring, the outer end of the second connecting rod is threadedly connected to the second nut, the second nut presses the sealing ring on the outer end face of the secondary valve cover through the gasket, and the sealing ring and the secondary valve cover are sealed through the second sealing ring.

[0013] Furthermore, it also includes a primary pilot valve cover, the primary pilot valve plug is a stepped shaft structure, the upper periphery of the primary pilot valve plug is processed with a fourth sealing groove, the fourth sealing groove is provided with a fourth sealing ring, the upper part of the primary pilot valve plug is plug-in sealed with the outer end of the primary valve inlet cavity through the fourth sealing ring, the lower diameter of the primary pilot valve plug is larger than the inner diameter of the primary valve inlet cavity, a countersunk groove is processed on the upper end surface of the primary pilot valve cover, the lower end of the primary pilot valve plug cooperates with the countersunk groove stop, and the primary pilot valve cover is detachably connected to the primary pilot valve body.

[0014] Furthermore, it also includes:

[0015] The main valve outlet sealing cover is provided with a second hydraulic pipe joint, the plugging cap seals the second hydraulic pipe joint, and the main valve inlet sealing cover is used to seal the medium outlet;

[0016] The secondary pilot valve screw plug is used to seal the threaded inner hole of the secondary valve cover;

[0017] The needle valve plug is used to block the second back pressure port, and the primary pilot valve cover blocks the primary valve outlet cavity.

[0018] Furthermore, a fifth sealing groove is processed on the right end face of the main valve outlet cover, a fifth sealing ring is arranged in the fifth sealing groove, a flange structure is provided at the left end of the medium outlet, the main valve outlet cover and the flange structure of the medium outlet are connected by bolts, the main valve outlet cover and the flange structure of the medium outlet are sealed by the fifth sealing ring, an external thread structure is provided at the left end of the second water pressure pipe joint, the plugging cap is threadedly connected to the second water pressure pipe joint, a third sealing gasket is provided in the plugging cap, and the plugging cap seals the second water pressure pipe joint through the third sealing gasket.

[0019] Furthermore, a convex stop is provided at the upper end of the primary pilot valve cover, and a concave stop is provided on the lower end surface of the primary pilot valve body. The primary pilot valve cover and the primary pilot valve body are connected by bolts, and the convex stop and the concave stop are sealed by a fourth sealing gasket.

[0020] Further, the secondary pilot valve plug is threadedly connected to the threaded inner hole of the secondary valve cover, a first flange is provided at the right end of the secondary pilot valve plug, a sixth sealing groove is processed on the left end surface of the first flange, a sixth sealing ring is arranged in the sixth sealing groove, and the secondary pilot valve plug is sealed against the right end surface of the secondary valve cover through the sixth sealing ring;

[0021] The needle valve plug is threadedly connected to the second back pressure port, and a second flange is provided at the right end of the needle valve plug. A seventh sealing groove is processed on the left end face of the second flange, and a seventh sealing ring is arranged in the seventh sealing groove. The secondary pilot valve plug is sealed against the right end face of the needle valve body through the seventh sealing ring.

[0022] The present invention also provides a pilot-operated safety valve water pressure strength test method, which is implemented based on the above-mentioned pilot-operated safety valve water pressure strength test tool, and includes the following steps:

[0023] Step 1: Sleeve the first sealing gasket on the first boss, hoist the main valve sealing surface cover from the medium inlet to the main valve cavity, screw the inner end of the first connecting rod into the first threaded blind hole, install the main valve pressure plate into the medium outlet, and pass the first connecting rod through the main valve pressure plate, tighten the first nut and the outer end of the first connecting rod, so that the first connecting rod tightens the main valve sealing surface cover, and the main valve sealing surface cover seals the valve seat;

[0024] Step 2, tighten the left end of the second connecting rod and the second threaded blind hole of the secondary pilot valve cover, sleeve the second sealing gasket on the second boss, pass the outer end of the second connecting rod through the secondary pilot valve body and the secondary valve cover in sequence, install the second sealing ring into the second sealing groove, install the third sealing ring into the third sealing groove, sleeve the sealing ring and the gasket on the second connecting rod in sequence, tighten the second nut and the second connecting rod, so that the second connecting rod tightens the secondary pilot valve cover, so that the secondary pilot valve cover is sealed with the left end face of the secondary pilot valve body through the second sealing gasket, the sealing ring is sealed with the right end face of the secondary valve cover through the second sealing ring, and the sealing ring is sealed with the outer periphery of the second connecting rod through the third sealing ring;

[0025] Step 3: Install the fourth sealing ring into the fourth sealing groove of the primary pilot valve plug, insert the upper part of the primary pilot valve plug into the primary valve inlet cavity, so that the primary pilot valve plug seals the primary valve inlet cavity, position and match the sink groove with the lower end of the primary pilot valve plug, and connect the primary pilot valve cover to the primary pilot valve body through the studs;

[0026] Step 4: Fill the main valve body with water from the medium inlet until the water level reaches the end face of the flange structure of the medium inlet;

[0027] Step 5: Install the first sealing ring into the first sealing groove, connect the main valve inlet cover with the flange structure of the medium inlet, and realize the sealing of the medium inlet;

[0028] Step 6: Connect the first hydraulic pipe joint to the booster pump and conduct a hydraulic strength test on the medium inlet end;

[0029] Step 7: After the water pressure strength test at the medium inlet is passed, release the water pressure;

[0030] Step 8: Install the fifth sealing ring into the fifth sealing groove of the main valve outlet cover, connect the main valve outlet cover to the flange structure of the medium outlet, and realize the sealing of the medium outlet;

[0031] Step 9: Install the seventh sealing ring into the seventh sealing groove of the needle valve plug, and tighten the needle valve plug and the second back pressure port, so that the needle valve plug is sealed with the needle valve body through the seventh sealing ring to seal the second back pressure port;

[0032] Step 10: first disassemble the primary pilot valve cover and the primary pilot valve plug, and quickly install the fourth sealing gasket into the concave stopper of the primary pilot valve body, and then connect the primary pilot valve cover to the primary pilot valve body, so that the primary pilot valve cover can seal the primary valve outlet cavity through the fourth sealing gasket, and the water in the main valve cavity can fill the primary valve inlet cavity, the primary valve outlet cavity and the needle valve cavity;

[0033] Step 11: first remove the second nut, washer and sealing ring, push the right end of the second connecting rod into the secondary pilot valve body, then install the sixth sealing ring into the sixth sealing groove of the secondary pilot valve plug, and then tighten the threaded inner hole of the secondary pilot valve plug and the secondary valve cover, so that the secondary pilot valve plug blocks the threaded inner hole of the secondary valve cover, and the water in the main valve cavity fills the first back pressure port and the secondary pilot valve cavity;

[0034] Step 12: Fill the medium outlet with water, and when the water overflows through the second hydraulic pipe joint, seal the second hydraulic pipe joint with a plugging cap;

[0035] Step 13: After the water pressure strength test at the outlet of the medium is qualified, the pressure is released and the water is drained. The water pressure strength test of the pilot-operated safety valve is completed.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The present invention fully considers the structure and working principle of the pilot-operated safety valve, clarifies the working pressure range of the inlet side and the outlet side, and utilizes the test fixture of the present invention to effectively isolate the medium inlet side and the medium outlet side, and conducts a high-pressure water pressure strength test on the medium inlet side; after the high-pressure part on the medium inlet side passes the water pressure strength test, the water pressure strength test of the low-pressure part on the medium outlet side can be conducted together with the medium inlet side, which has no effect on the valve water pressure strength test, and avoids conducting a water pressure strength test on the medium outlet side alone; after completing the water pressure strength test on the medium inlet side, there is no need to remove the main valve sealing surface cover, the main valve pressure plate and the first connecting rod at the valve seat, and the medium outlet and the medium inlet can be connected through the secondary pilot valve cavity and the exhaust pipe. The use and operation of the test fixture of the present invention and the test method are simple, and the operation is simple and safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the state of the present invention performing a high pressure test on one side of the medium inlet;

[0039] Figure 2 yes Figure 1 Schematic diagram of point A;

[0040] Figure 3 It is a schematic diagram of the state of the present invention performing a low-pressure test on one side of the medium outlet;

[0041] Figure 4 yes Figure 3 The enlarged view of point B;

[0042] Figure 5 It is a schematic diagram of the structure of the pilot-operated safety valve housing;

[0043] Figure 6 yes Figure 5 Enlarged view of point C;

[0044] Figure 7 yes Figure 5 Bottom view of .

[0045] In the figure, 1. main valve body, 2. valve seat, 3. medium inlet, 4. medium outlet, 5. main valve cover seal, 6. secondary pilot valve body, 7. secondary valve cover, 8. air inlet pipe, 9. first pressure relief port, 10. primary pilot valve body, 11. primary valve inlet cavity, 12. primary valve outlet cavity, 13. second pressure relief port, 14. needle valve cavity, 15. second back pressure port, 16. needle valve body, 17. main valve inlet cover, 18. first hydraulic pipe joint, 19. first sealing ring, 20. main valve sealing surface cover, 21. first sealing gasket, 22. main valve pressure plate, 23. first nut, 24. first connecting rod, 25. secondary pilot valve cover, 26. first Second sealing gasket, 27. Secondary pilot valve cavity, 28. First back pressure port, 29. Second sealing ring, 30. Third sealing ring, 31. Second nut, 32. Washer, 33. Sealing ring, 34. Fourth sealing ring, 35. Primary pilot valve plug, 36. Primary pilot valve cover, 37. Main valve outlet cover, 38. Fifth sealing ring, 39. Second water pressure pipe joint, 40. Plug cap, 41. Third sealing gasket, 42. Secondary pilot valve plug, 43. Sixth sealing ring 43, 44. Seventh sealing ring 44, 45. Needle valve plug, 46. Fourth sealing gasket, 47. Sink, 48. Main valve cavity, 49. Second connecting rod, 50. Exhaust pipe. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0047] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection is a non-detachable connection including but not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but not limited to conventional detachable methods such as bolt connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can be found in the existing connection methods to achieve the function, and those skilled in the art can choose according to their needs. For example: welding connection is selected for fixed connection, and bolt connection is selected for detachable connection.

[0048] The present invention will be further described in detail below in conjunction with the accompanying drawings. The following embodiments are provided to explain the present invention, but the present invention is not limited to the following embodiments.

[0049] Embodiment 1: Figure 1 to Figure 7 As shown, a pilot safety valve water pressure strength test tool, the pilot safety valve includes a main valve body 1, the main valve body 1 is a three-way shape, the upper opening, the left opening and the right opening of the main valve body 1 are connected through the main valve cavity 48, the main valve cover 5 closes the right opening of the main valve body 1, the upper opening of the main valve body 1 is the medium inlet 3, the left opening of the main valve body 1 is the medium outlet 4, the medium outlet 4 is in a cone shape, the valve seat 2 is arranged at the right end of the medium outlet 4, the right end surface of the valve seat 2 is the main sealing surface of the pilot safety valve, the left end of the secondary pilot valve body 6 penetrates the valve cover, the left end of the secondary pilot valve body 6 is provided with a first pressure relief port 9, the right end of the secondary pilot valve body 6 is provided with a first back pressure port 28, the first pressure relief port 9 and the first back pressure port 28 are connected through the secondary pilot valve cavity 27, the secondary pilot valve cavity 27 is connected with the main valve cavity 48 through the first pressure relief port 9, the secondary pilot valve cavity 27 is connected with the medium outlet 4 through the exhaust pipe 50, the secondary valve cover 7 closes the first back pressure port 28, the secondary valve cover 7 is provided with a threaded inner hole, the lower outer wall of the secondary pilot valve body 6 is provided with a primary pilot valve body 10, the lower end surface of the primary pilot valve body 10 is processed with a primary valve outlet cavity 12 and a primary valve inlet cavity 11 in sequence from bottom to top, the medium inlet 3 and the upper end of the primary valve inlet cavity 11 are connected through the intake pipe 8, the seat end of the needle valve body 16 passes through the right side wall of the primary valve outlet cavity 12, the left end of the needle valve body 16 is provided with a second pressure relief port 13, the right end of the needle valve body 16 is provided with a second back pressure port 15, the second back pressure port 15 is provided with an internal thread structure, the second pressure relief port 13 and the second back pressure port 15 are connected through the needle valve cavity 14, the needle valve cavity 14 is connected with the primary valve outlet cavity 12 through the second pressure relief port 13, the test fixture includes:

[0050] A main valve inlet sealing cover 17, on which a first hydraulic pipe joint 18 is provided, and the main valve inlet sealing cover 17 is used to block the medium inlet 3;

[0051] The main valve sealing surface cover 20, the outer peripheral cone surface of the main valve pressure plate 22 matches the inner peripheral cone surface of the medium outlet 4, the right end of the first connecting rod 24 is detachably connected to the main valve sealing surface cover 20, and the left end of the first connecting rod 24 is detachably connected to the main valve pressure plate 22. The main valve sealing surface cover 20 and the main valve pressure plate 22 are tightened by the first connecting rod 24, and the main valve sealing surface cover 20 blocks the valve seat 2;

[0052] The left end face of the secondary pilot valve cover 25 and the sealing ring 33 are sealed against the right end face of the secondary valve cover 7, the right end of the second connecting rod 49 is sealedly connected to the sealing ring 33, the left end of the second connecting rod 49 is detachably connected to the secondary pilot valve cover 25, the secondary pilot valve cover 25 and the sealing ring 33 are tightened by the second connecting rod 49, and the secondary pilot valve cover 25 blocks the first pressure relief port 9;

[0053] The primary pilot valve plug 35 has an upper end that blocks the lower end of the primary valve inlet cavity 11 .

[0054] A first sealing groove is provided on the lower end surface of the main valve inlet cover 17, and a first sealing ring 19 is arranged in the first sealing groove. A flange structure is provided at the upper end of the medium inlet 3. The main valve inlet cover 17 and the flange structure of the medium inlet 3 are connected by bolts, and the main valve inlet cover 17 and the flange structure of the medium inlet 3 are sealed by the first sealing ring 19.

[0055] A first boss is provided on the left end face of the main valve sealing surface cover 20, and the outer periphery of the first boss matches with the inner periphery of the valve seat 2. A first threaded blind hole is processed on the left end face of the first boss, and the right end of the first connecting rod 24 is threadedly matched with the first threaded blind hole. The left end of the first connecting rod 24 passes through the main valve pressure plate 22 and is threadedly connected with the first nut 23. The first nut 23 is pressed against the left end face of the main valve pressure plate 22, and a first sealing gasket 21 is sleeved on the first boss. The left end face of the main valve sealing surface cover 20 and the right end face of the valve seat 2 are sealed by the first sealing gasket 21.

[0056] A second boss is provided on the right end surface of the secondary pilot valve cover 25, the outer periphery of the second boss matches with the inner periphery of the first pressure relief port 9, a second sealing gasket 26 is sleeved on the second boss, the right end surface of the secondary pilot valve cover 25 and the left end surface of the secondary pilot valve body 6 are sealed through the second sealing gasket 26, a second threaded blind hole is provided on the right end surface of the second boss, the left end of the second connecting rod 49 is threadedly matched with the second threaded blind hole, and the right end of the second connecting rod 49 passes through the secondary valve cover 7, the sealing ring 33 and the gasket 32, and the sealing A second sealing groove is processed on the left end face of the sealing ring 33, and a second sealing ring 29 is arranged in the second sealing groove. A third sealing groove is processed on the inner periphery of the sealing ring 33, and a third sealing ring 30 is arranged in the second sealing groove. The sealing ring 33 and the second connecting rod 49 are sealed by the third sealing ring 30. The outer end of the second connecting rod 49 is threadedly connected with the second nut 31. The second nut 31 presses the sealing ring 33 onto the outer end face of the secondary valve cover 7 through the gasket 32. The sealing ring 33 and the secondary valve cover 7 are sealed by the second sealing ring 29.

[0057] It also includes a primary pilot valve cover 36. The primary pilot valve plug 35 is a stepped shaft structure. The upper periphery of the primary pilot valve plug 35 is processed with a fourth sealing groove, and the fourth sealing groove is provided with a fourth sealing ring 34. The upper part of the primary pilot valve plug 35 is plugged and sealed with the outer end of the primary valve inlet cavity 11 through the fourth sealing ring 34. The lower diameter of the primary pilot valve plug 35 is larger than the inner diameter of the primary valve inlet cavity 11. A recessed groove 47 is processed on the upper end surface of the primary pilot valve cover 36. The lower end of the primary pilot valve plug 35 cooperates with the stop of the recessed groove 47. The primary pilot valve cover 36 is detachably connected to the primary pilot valve body 10.

[0058] Also includes:

[0059] The main valve outlet cover 37 is provided with a second hydraulic pipe joint 39, and the plugging cap 40 blocks the second hydraulic pipe joint 39. The main valve inlet cover 17 is used to block the medium outlet 4;

[0060] The secondary pilot valve screw plug 42 is used to block the threaded inner hole of the secondary valve cover 7;

[0061] The needle valve plug 45 is used to seal the second back pressure port 15 , and the primary pilot valve cover 36 seals the primary valve outlet cavity 12 .

[0062] A fifth sealing groove is processed on the right end face of the main valve outlet cover 37, and a fifth sealing ring 38 is arranged in the fifth sealing groove. A flange structure is provided at the left end of the medium outlet 4, and the main valve outlet cover 37 is connected to the flange structure of the medium outlet 4 by bolts. The main valve outlet cover 37 and the flange structure of the medium outlet 4 are sealed by the fifth sealing ring 38. An external thread structure is provided at the left end of the second water pressure pipe joint 39, and the plugging cap 40 is threadedly connected to the second water pressure pipe joint 39. A third sealing gasket 41 is provided in the plugging cap 40, and the plugging cap 40 blocks the second water pressure pipe joint 39 through the third sealing gasket 41.

[0063] A convex stop is provided at the upper end of the primary pilot valve cover 36 , and a concave stop is provided on the lower end surface of the primary pilot valve body 10 . The primary pilot valve cover 36 and the primary pilot valve body 10 are connected by bolts, and the convex stop and the concave stop are sealed by a fourth sealing gasket 46 .

[0064] The secondary pilot valve plug 42 is threadedly connected to the threaded inner hole of the secondary valve cover 7. The right end of the secondary pilot valve plug 42 is provided with a first flange. The left end surface of the first flange is processed with a sixth sealing groove. The sixth sealing ring 43 is arranged in the sixth sealing groove. The secondary pilot valve plug 42 is sealed against the right end surface of the secondary valve cover 7 through the sixth sealing ring 43.

[0065] The needle valve plug 45 is threadedly connected to the second back pressure port 15. A second flange is provided at the right end of the needle valve plug 45. A seventh sealing groove is processed on the left end face of the second flange. The seventh sealing ring 44 is arranged in the seventh sealing groove. The secondary pilot valve plug 42 is sealed against the right end face of the needle valve body 16 through the seventh sealing ring 44.

[0066] Embodiment 2: Figure 1 to Figure 7 As shown, a pilot-operated safety valve water pressure strength test method is implemented based on a pilot-operated safety valve water pressure strength test tool described in Example 1, and includes the following steps:

[0067] Step 1: sleeve the first sealing gasket 21 on the first boss, hoist the main valve sealing surface cover 20 from the medium inlet 3 to the main valve cavity 48, screw the inner end of the first connecting rod 24 into the first threaded blind hole, install the main valve pressure plate 22 into the medium outlet 4, and make the first connecting rod 24 pass through the main valve pressure plate 22, tighten the first nut 23 and the outer end of the first connecting rod 24, so that the first connecting rod 24 tightens the main valve sealing surface cover 20, and the main valve sealing surface cover 20 seals the valve seat 2;

[0068] Step 2, tighten the left end of the second connecting rod 49 with the second threaded blind hole of the secondary pilot valve cover 25, sleeve the second sealing gasket 26 on the second boss, pass the outer end of the second connecting rod 49 through the secondary pilot valve body 6 and the secondary valve cover 7 in sequence, install the second sealing ring 29 into the second sealing groove, install the third sealing ring 30 into the third sealing groove, sleeve the sealing ring 33 and the gasket 32 ​​on the second connecting rod 49 in sequence, tighten the second nut 31 with the second connecting rod 49, so that the second connecting rod 49 tightens the secondary pilot valve cover 25, so that the secondary pilot valve cover 25 is sealed with the left end face of the secondary pilot valve body 6 through the second sealing gasket 26, the sealing ring 33 is sealed with the right end face of the secondary valve cover 7 through the second sealing ring 29, and the sealing ring 33 is sealed with the outer periphery of the second connecting rod 49 through the third sealing ring 30;

[0069] Step 3, install the fourth sealing ring 34 into the fourth sealing groove of the primary pilot valve plug 35, insert the upper part of the primary pilot valve plug 35 into the primary valve inlet cavity 11, realize that the primary pilot valve plug 35 blocks the primary valve inlet cavity 11, position and match the sink 47 with the lower end of the primary pilot valve plug 35, and connect the primary pilot valve cover 36 to the primary pilot valve body 10 through the studs;

[0070] Step 4: Fill the main valve body 1 with water from the medium inlet 3 until the water level reaches the flange structure end face of the medium inlet 3;

[0071] Step 5: Install the first sealing ring 19 into the first sealing groove, connect the main valve inlet cover 17 to the flange structure of the medium inlet 3, and realize the sealing of the medium inlet 3;

[0072] Step 6: Connect the first hydraulic pipe joint 18 to the booster pump and conduct a hydraulic strength test on the medium inlet 3 end;

[0073] Step 7: After the water pressure strength test at the medium inlet 3 ends is passed, release the water pressure;

[0074] Step 8: Install the fifth sealing ring 38 into the fifth sealing groove of the main valve outlet cover 37, and connect the main valve outlet cover 37 to the flange structure of the medium outlet 4 to achieve sealing of the medium outlet 4;

[0075] Step nine, install the seventh sealing ring 44 into the seventh sealing groove of the needle valve plug 45, and tighten the needle valve plug 45 and the second back pressure port 15, so that the needle valve plug 45 is sealed with the needle valve body 16 through the seventh sealing ring 44, thereby sealing the second back pressure port 15;

[0076] Step 10: first disassemble the primary pilot valve cover 36 and the primary pilot valve plug 35, and quickly install the fourth sealing gasket 46 into the concave stopper of the primary pilot valve body 10, and then connect the primary pilot valve cover 36 to the primary pilot valve body 10, so that the primary pilot valve cover 36 blocks the primary valve outlet cavity 12 through the fourth sealing gasket 46, and the water in the main valve cavity 1 can fill the primary valve inlet cavity 11, the primary valve outlet cavity 12 and the needle valve cavity 14;

[0077] Step 11: first remove the second nut 31, the washer 32 and the sealing ring 33, push the right end of the second connecting rod 49 into the secondary pilot valve body 6, and then install the sixth sealing ring 43 into the sixth sealing groove of the secondary pilot valve plug 42, and then tighten the secondary pilot valve plug 42 and the threaded inner hole of the secondary valve cover 7, so that the secondary pilot valve plug 42 blocks the threaded inner hole of the secondary valve cover 7, and the water in the main valve cavity 1 fills the first back pressure port 28 and the secondary pilot valve cavity 27;

[0078] Step 12: Fill the medium outlet 4 with water. When the water overflows through the second hydraulic pipe joint 39, seal the second hydraulic pipe joint 39 with a plugging cap 40.

[0079] Step 13: After the water pressure strength test at the medium outlet 4 is passed, the pressure is released and the water is drained. The water pressure strength test of the pilot safety valve is completed.

[0080] The main valve inlet cover 17, the main valve sealing surface cover 20, the secondary pilot valve cover 25, the sealing ring 33 and the primary pilot valve plug 35 are used to isolate and block the medium inlet 3, the main valve cavity 48 and the right opening of the main valve body. With such a configuration, a high-pressure water pressure strength test can be performed on one side of the medium inlet 3 to see whether there is a pressure-bearing problem on one side of the medium inlet 3. The main valve outlet cover 37, the plug cap 40, the secondary pilot valve screw plug 42 and the needle valve plug 45 can block the main valve body 1, the primary pilot valve body 10, the secondary pilot valve body 6 and the needle valve body 16, and make them connected. With such a configuration, a low-pressure water pressure test can be performed together to check the overall pressure-bearing capacity.

[0081] The present invention fully considers the structure and working principle of the pilot-operated safety valve, clarifies the working pressure range of the inlet side and the outlet side, and utilizes the test fixture of the present invention to effectively isolate the medium inlet 3 side and the medium outlet 4 side, and conducts a high-pressure water pressure strength test on the medium inlet 3 side; after the high-pressure part on the medium inlet 3 side passes the water pressure strength test, the water pressure strength test of the low-pressure part on the medium outlet 4 side can be conducted together with the medium inlet 3 side, which has no effect on the valve water pressure strength test, and avoids conducting a water pressure strength test on the medium outlet 4 side alone; after completing the water pressure strength test on the medium inlet 3 side, there is no need to remove the main valve sealing surface cover 20, the main valve pressure plate 22 and the first connecting rod 24 at the valve seat 2, and the medium outlet 4 and the medium inlet 3 can be connected through the secondary pilot valve chamber 27 and the exhaust pipe 50. The use and operation of the test fixture of the present invention and the test method are simple, and the operation is simple and safe.

[0082] The above embodiments are merely exemplary descriptions of the present invention and do not limit its protection scope. Those skilled in the art may also make partial changes thereto, which are within the protection scope of the present invention as long as they do not exceed the spirit of the present invention.

Claims

1. A pilot-operated safety valve water pressure strength test tool, the pilot-operated safety valve comprising a main valve body (1), the main valve body (1) is in a three-way shape, the upper opening, the left opening and the right opening of the main valve body (1) are connected through a main valve chamber (48), the main valve cover (5) closes the right opening of the main valve body (1), the upper opening of the main valve body (1) is a medium inlet (3), the left opening of the main valve body (1) is a medium outlet (4), the medium outlet (4) is in a conical tube shape, and the valve seat (2) is arranged at the medium outlet (4) The right end of the valve seat (2) is the main sealing surface of the pilot safety valve. The left end of the secondary pilot valve body (6) penetrates the valve cover. The left end of the secondary pilot valve body (6) is provided with a first pressure relief port (9). The right end of the secondary pilot valve body (6) is provided with a first back pressure port (28). The first pressure relief port (9) and the first back pressure port (28) are connected through the secondary pilot valve cavity (27). The secondary pilot valve cavity (27) and the main valve cavity (48) are connected through the first pressure relief port (9). The secondary valve cover (27) is connected to the medium outlet (4) through the exhaust pipe (50), the secondary valve cover (7) closes the first back pressure port (28), the secondary valve cover (7) is provided with a threaded inner hole, the lower outer wall of the secondary pilot valve body (6) is provided with a primary pilot valve body (10), the lower end surface of the primary pilot valve body (10) is processed with a primary valve outlet cavity (12) and a primary valve inlet cavity (11) in sequence from bottom to top, the upper ends of the medium inlet (3) and the primary valve inlet cavity (11) are connected through the air inlet pipe (8) The seat end of the needle valve body (16) passes through the right side wall of the primary valve outlet chamber (12), the left end of the needle valve body (16) is provided with a second pressure relief port (13), the right end of the needle valve body (16) is provided with a second back pressure port (15), the second back pressure port (15) is provided with an internal thread structure, the second pressure relief port (13) and the second back pressure port (15) are communicated through the needle valve chamber (14), the needle valve chamber (14) and the primary valve outlet chamber (12) are communicated through the second pressure relief port (13), and the characteristics are as follows: The test tooling comprises: A main valve inlet sealing cover (17), on which a first hydraulic pipe joint (18) is provided, and the main valve inlet sealing cover (17) is used to seal the medium inlet (3); The main valve sealing surface cover (20), the outer peripheral conical surface of the main valve pressure plate (22) matches the inner peripheral conical surface of the medium outlet (4), the right end of the first connecting rod (24) is detachably connected to the main valve sealing surface cover (20), the left end of the first connecting rod (24) is detachably connected to the main valve pressure plate (22), the main valve sealing surface cover (20) and the main valve pressure plate (22) are tightened by the first connecting rod (24), and the main valve sealing surface cover (20) blocks the valve seat (2); The secondary pilot valve cover (25), the left end face of the sealing ring (33) is sealed against the right end face of the secondary valve cover (7), the right end of the second connecting rod (49) is sealedly connected to the sealing ring (33), the left end of the second connecting rod (49) is detachably connected to the secondary pilot valve cover (25), the secondary pilot valve cover (25) and the sealing ring (33) are tightened by the second connecting rod (49), and the secondary pilot valve cover (25) blocks the first pressure relief port (9); A primary pilot valve plug (35), the upper end of which blocks the lower end of the primary valve inlet chamber (11).

2. A pilot-operated safety valve water pressure strength test tool according to claim 1, characterized in that: A first sealing groove is provided on the lower end surface of the main valve inlet cover (17), and a first sealing ring (19) is arranged in the first sealing groove. A flange structure is provided at the upper end of the medium inlet (3). The main valve inlet cover (17) and the flange structure of the medium inlet (3) are connected by bolts. The main valve inlet cover (17) and the flange structure of the medium inlet (3) are sealed by the first sealing ring (19).

3. A pilot-operated safety valve water pressure strength test tool as claimed in claim 2, characterized in that: A first boss is provided on the left end face of the main valve sealing surface cover (20), the outer periphery of the first boss matches with the inner periphery of the valve seat (2), a first threaded blind hole is processed on the left end face of the first boss, the right end of the first connecting rod (24) is threadedly matched with the first threaded blind hole, the left end of the first connecting rod (24) passes through the main valve pressure plate (22) and is threadedly connected with the first nut (23), the first nut (23) is pressed against the left end face of the main valve pressure plate (22), a first sealing gasket (21) is sleeved on the first boss, and the left end face of the main valve sealing surface cover (20) and the right end face of the valve seat (2) are sealed through the first sealing gasket (21).

4. A pilot operated safety valve water pressure strength test tool as claimed in claim 3, characterized in that: A second boss is provided on the right end surface of the secondary pilot valve cover (25), the outer periphery of the second boss is matched with the inner periphery of the first pressure relief port (9), a second sealing gasket (26) is sleeved on the second boss, the right end surface of the secondary pilot valve cover (25) is sealed with the left end surface of the secondary pilot valve body (6) through the second sealing gasket (26), a second threaded blind hole is provided on the right end surface of the second boss, the left end of the second connecting rod (49) is threadedly matched with the second threaded blind hole, the right end of the second connecting rod (49) passes through the secondary valve cover (7), the sealing ring (33) and the gasket (32), the sealing ring (33 ) is machined on the left end face of the secondary valve cover (7), a second sealing groove is arranged in the second sealing groove, a third sealing groove is machined on the inner circumference of the sealing ring (33), a third sealing ring (30) is arranged in the second sealing groove, the sealing ring (33) and the second connecting rod (49) are sealed by the third sealing ring (30), the outer end of the second connecting rod (49) is threadedly connected to the second nut (31), the second nut (31) presses the sealing ring (33) onto the outer end face of the secondary valve cover (7) through the gasket (32), and the sealing ring (33) and the secondary valve cover (7) are sealed by the second sealing ring (29).

5. A pilot-operated safety valve water pressure strength test tool as claimed in claim 4, characterized in that: The first pilot valve plug (35) also includes a primary pilot valve cover (36). The primary pilot valve plug (35) is a stepped shaft structure. A fourth sealing groove is processed on the upper periphery of the primary pilot valve plug (35). A fourth sealing ring (34) is provided on the fourth sealing groove. The upper part of the primary pilot valve plug (35) is plugged and sealed with the outer end of the primary valve inlet chamber (11) through the fourth sealing ring (34). The lower diameter of the primary pilot valve plug (35) is larger than the inner diameter of the primary valve inlet chamber (11). A recessed groove (47) is processed on the upper end surface of the primary pilot valve cover (36). The lower end of the primary pilot valve plug (35) cooperates with the stop of the recessed groove (47). The primary pilot valve cover (36) is detachably connected to the primary pilot valve body (10).

6. A pilot operated safety valve water pressure strength test tool as claimed in claim 5, characterized in that: Also includes: A main valve outlet sealing cover (37), wherein a second hydraulic pipe joint (39) is provided on the main valve outlet sealing cover (37), a plugging cap (40) blocks the second hydraulic pipe joint (39), and a main valve inlet sealing cover (17) is used to block the medium outlet (4); A secondary pilot valve screw plug (42) is used to seal the threaded inner hole of the secondary valve cover (7); The needle valve plug (45) is used to seal the second back pressure port (15), and the primary pilot valve cover (36) seals the primary valve outlet cavity (12).

7. A pilot operated safety valve water pressure strength test tool as claimed in claim 6, characterized in that: A fifth sealing groove is processed on the right end surface of the main valve outlet cover (37), and a fifth sealing ring (38) is arranged in the fifth sealing groove. A flange structure is provided at the left end of the medium outlet (4). The main valve outlet cover (37) is connected to the flange structure of the medium outlet (4) by bolts. The main valve outlet cover (37) and the flange structure of the medium outlet (4) are sealed by the fifth sealing ring (38). An external thread structure is provided at the left end of the second water pressure pipe joint (39). The plugging cap (40) is threadedly connected to the second water pressure pipe joint (39). A third sealing gasket (41) is provided in the plugging cap (40). The plugging cap (40) blocks the second water pressure pipe joint (39) through the third sealing gasket (41).

8. A pilot operated safety valve water pressure strength test tool as claimed in claim 7, characterized in that: A convex stop is provided at the upper end of the primary pilot valve cover (36), and a concave stop is provided on the lower end surface of the primary pilot valve body (10). The primary pilot valve cover (36) and the primary pilot valve body (10) are connected by bolts, and the convex stop and the concave stop are sealed by a fourth sealing gasket (46).

9. A pilot operated safety valve water pressure strength test tool as claimed in claim 8, characterized in that: The secondary pilot valve plug (42) is threadedly connected to the threaded inner hole of the secondary valve cover (7); a first flange is provided at the right end of the secondary pilot valve plug (42); a sixth sealing groove is processed on the left end surface of the first flange; a sixth sealing ring (43) is arranged in the sixth sealing groove; the secondary pilot valve plug (42) is sealed against the right end surface of the secondary valve cover (7) through the sixth sealing ring (43); The needle valve plug (45) is threadedly connected to the second back pressure port (15). A second flange is provided at the right end of the needle valve plug (45). A seventh sealing groove is processed on the left end surface of the second flange. A seventh sealing ring (44) is arranged in the seventh sealing groove. The secondary pilot valve plug (42) is sealed against the right end surface of the needle valve body (16) through the seventh sealing ring (44).

10. A pilot-operated safety valve water pressure strength test method, implemented by relying on a pilot-operated safety valve water pressure strength test tool as claimed in claim 9, characterized in that: The following steps are involved: Step 1: sleeve the first sealing gasket (21) onto the first boss, hoist the main valve sealing surface cover (20) from the medium inlet (3) to the main valve cavity (48), screw the inner end of the first connecting rod (24) into the first threaded blind hole, install the main valve pressure plate (22) into the medium outlet (4), and make the first connecting rod (24) pass through the main valve pressure plate (22), tighten the first nut (23) and the outer end of the first connecting rod (24), so that the first connecting rod (24) tightens the main valve sealing surface cover (20), and the main valve sealing surface cover (20) seals the valve seat (2); Step 2: Tighten the left end of the second connecting rod (49) to the second threaded blind hole of the secondary pilot valve cover (25), sleeve the second sealing gasket (26) on the second boss, pass the outer end of the second connecting rod (49) through the secondary pilot valve body (6) and the secondary valve cover (7) in sequence, install the second sealing ring (29) into the second sealing groove, install the third sealing ring (30) into the third sealing groove, and sleeve the sealing ring (33) and the gasket (32) into the second On the connecting rod (49), the second nut (31) is tightened with the second connecting rod (49), so that the second connecting rod (49) tightens the secondary pilot valve cover (25), so that the secondary pilot valve cover (25) is sealed with the left end face of the secondary pilot valve body (6) through the second sealing gasket (26), the sealing ring (33) is sealed with the right end face of the secondary valve cover (7) through the second sealing ring (29), and the sealing ring (33) is sealed with the outer periphery of the second connecting rod (49) through the third sealing ring (30); Step 3: Install the fourth sealing ring (34) into the fourth sealing groove of the primary pilot valve plug (35), insert the upper part of the primary pilot valve plug (35) into the primary valve inlet cavity (11), so that the primary pilot valve plug (35) blocks the primary valve inlet cavity (11), position and match the sink groove (47) with the lower end of the primary pilot valve plug (35), and connect the primary pilot valve cover (36) to the primary pilot valve body (10) through the stud bolt; Step 4: Fill the main valve body (1) with water from the medium inlet (3) until the water level reaches the end face of the flange structure of the medium inlet (3); Step 5: Install the first sealing ring (19) into the first sealing groove, connect the main valve inlet cover (17) to the flange structure of the medium inlet (3), and achieve sealing of the medium inlet (3); Step 6: Connect the first hydraulic pipe joint (18) to the booster pump and perform a hydraulic strength test on the medium inlet (3); Step 7: After the water pressure strength test at the medium inlet (3) is passed, the water pressure is released; Step 8: Install the fifth sealing ring (38) into the fifth sealing groove of the main valve outlet cover (37), connect the main valve outlet cover (37) to the flange structure of the medium outlet (4), and achieve sealing of the medium outlet (4); Step 9: Install the seventh sealing ring (44) into the seventh sealing groove of the needle valve plug (45), and tighten the needle valve plug (45) and the second back pressure port (15) so that the needle valve plug (45) is sealed with the needle valve body (16) through the seventh sealing ring (44), thereby sealing the second back pressure port (15); Step 10: first disassemble the primary pilot valve cover (36) and the primary pilot valve plug (35), and quickly install the fourth sealing gasket (46) into the concave stopper of the primary pilot valve body (10), and then connect the primary pilot valve cover (36) to the primary pilot valve body (10), so that the primary pilot valve cover (36) can seal the primary valve outlet chamber (12) through the fourth sealing gasket (46), and the water in the main valve chamber (1) can fill the primary valve inlet chamber (11), the primary valve outlet chamber (12) and the needle valve chamber (14); Step 11: first remove the second nut (31), the washer (32) and the sealing ring (33), push the right end of the second connecting rod (49) into the secondary pilot valve body (6), and then install the sixth sealing ring (43) into the sixth sealing groove of the secondary pilot valve plug (42), and then tighten the threaded inner hole of the secondary pilot valve plug (42) and the secondary valve cover (7) so that the secondary pilot valve plug (42) blocks the threaded inner hole of the secondary valve cover (7), and the water in the main valve chamber (1) fills the first back pressure port (28) and the secondary pilot valve chamber (27); Step 12: Fill the medium outlet (4) with water. When the water overflows through the second hydraulic pipe joint (39), seal the second hydraulic pipe joint (39) with a plugging cap (40); Step 13: After the water pressure strength test at the medium outlet (4) is passed, the pressure is released and the water is discharged. The water pressure strength test of the pilot-operated safety valve is completed.

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