A kind of wedge single gate plate gate valve body sealing surface measuring frock

Abstract

A measuring fixture for the sealing surface of a wedge-type single-gate valve body, belonging to the field of valve processing technology, addresses the difficulty in measuring the distance between the sealing surfaces on both sides of a wedge-type single-gate valve. It includes a reference body and a main shaft. The reference body is connected to the valve body, with its inner bore axis directly above the reference body's axis. The main shaft is coaxial with the inner bore of the reference body and can move left and right. A measuring rod is locked to the main shaft. By measuring the tangential contact between the measuring rod and the two sealing surfaces, the horizontal distance between the center of the sealing surface and the axis of the measuring rod is calculated. Furthermore, by measuring the change in distance of the measuring rod when it is tangential to the two sealing surfaces, the center-to-center distance between the two sealing surfaces can be accurately obtained. This invention allows for efficient and accurate measurement of the distance between the sealing surfaces of a single-gate valve body.

Description

Technical Field

[0001] This invention belongs to the field of valve processing technology, and in particular relates to a measuring tool for the sealing surface of a wedge-type single-gate valve body. Background Technology

[0002] In the petrochemical and power industries, wedge gate valves have gained widespread application due to their unique structural advantages. Currently, domestic manufacturers generally adopt a single-layer machining process for valve disc thickness. This process adjusts the valve disc thickness during assembly to compensate for measurement errors in the distance between the two valve seat sealing surfaces during machining. Because the valve seats are fixed to the valve body by welding, welding deformation needs to be eliminated through precision machining. Furthermore, the two valve seats are arranged symmetrically at a specific angle, making accurate measurement of the distance quite difficult. Although this process ensures that the valve's sealing performance meets design requirements, its machining efficiency is low, and it leads to poor interchangeability of valve components. When internal leakage occurs during field use, it often results in difficult and time-consuming repairs. Summary of the Invention

[0003] The purpose of this invention is to provide a tooling for measuring the sealing surface of a wedge-type single-gate valve body, thereby solving the problems of difficulty in measuring the distance between the sealing surfaces on both sides of the wedge-type single-gate valve and poor valve body interchangeability. The technical solution adopted by this invention is as follows:

[0004] A measuring fixture for the sealing surface of a wedge-type single-gate valve body, wherein the valve body is provided with a first valve seat sealing surface and a second valve seat sealing surface that are symmetrically arranged on the left and right sides, and the measuring fixture includes a main shaft, a locking sleeve, a measuring rod, a reference body and a main nut;

[0005] The reference body is a tubular component. The outer periphery of the reference body is provided with a reference shoulder. The outer periphery of the reference shoulder is adapted to the diameter of the valve body. The right end of the reference body is connected to the right end flange of the valve body. The inner hole axis of the reference body is directly above the axis of the reference shoulder. A main nut is coaxially rotatably installed in the inner hole of the reference body.

[0006] The spindle comprises a measuring section, a shoulder section, a support guide section, and a threaded section, which are coaxially connected from left to right. The outer periphery of the shoulder section has a threaded structure. The measuring section has a reversing groove. The locking sleeve has a through waist-shaped hole along the radial direction. The locking sleeve is fitted onto the measuring section and threadedly connected to the shoulder section. The measuring rod is a round rod that passes through the reversing groove and the waist-shaped hole. The reversing groove has at least one horizontal limiting surface, and the distance between the horizontal limiting surface and the axis of the spindle is equal to the radius of the measuring rod. During measurement, the locking sleeve presses the measuring rod onto the horizontal limiting surface through the side wall of the waist-shaped hole. The threaded section is threadedly connected to the main nut. The lower side of the support guide section has a guide groove that is opened along the axial direction. The upper end of the support positioning pin passes through the reference body and is slidably engaged with the guide groove.

[0007] Let θ be the angle between the first valve seat sealing surface and the second valve seat sealing surface, a be the distance between the inner hole axis of the reference body and the axis of the reference shoulder, and r be the radius of the auxiliary measuring rod. Then a and r satisfy the following formula:

[0008] .

[0009] Furthermore, the reversing slot is formed by connecting two symmetrical sector-shaped cross-section slots. One side of the sector-shaped cross-section slot is a vertical surface, and the other side is a horizontal limiting surface. The sector-shaped openings of the two sector-shaped cross-section slots face opposite directions, and the central angles of the two sector-shaped cross-section slots coincide. The overlapping part forms a square cross-section cavity with a side length of r.

[0010] Furthermore, the inner hole of the reference body is composed of a clearance hole section, a retaining ring hole section, a countersunk hole section, and a threaded hole section, which are coaxially connected from left to right. The diameter of the threaded hole section is larger than the diameter of the countersunk hole section, and the diameter of the countersunk hole section is larger than the diameter of the retaining ring hole section. The main nut is rotatably set in the countersunk hole section. The outer circumference of the main nut is provided with a limiting flange. The outer circumference of the pressure ring is threadedly connected to the inner circumference of the threaded hole section. Two thrust bearings are sleeved on the main nut. The left end face of the limiting flange abuts against the bottom surface of the countersunk hole section through one thrust bearing, and the right end face of the limiting flange abuts against the left end face of the pressure ring through the other thrust bearing.

[0011] Furthermore, a locking screw hole is drilled and tapped between the connecting threads of the pressure ring and the reference body, and the locking screw is threaded into the locking screw hole.

[0012] Furthermore, a support screw hole is machined on the side wall of the reference body. The outer periphery of the support guide pin is threadedly engaged with the support screw hole. The support guide pin is threadedly connected to the anti-reverse nut, and the anti-reverse nut is locked and pressed against the lower side of the reference body.

[0013] Furthermore, the right end of the reference body is provided with a connecting flange plate, which is provided with a first positioning hole, a second positioning hole, a first bolt hole and a second bolt hole. The first positioning hole is engaged with the flange hole corresponding to the right end flange of the valve body by a stepped cylindrical pin, the second positioning hole is engaged with the flange hole corresponding to the right end flange of the valve body by a chamfered pin, and the first bolt hole and the second bolt hole are both connected to the flange hole corresponding to the right end flange of the valve body by fastening bolts and fastening nuts.

[0014] Furthermore, the right end of the main nut protrudes from the inner hole of the pressure ring, and a cross groove is provided on the right end face of the main nut.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] By ensuring that the tangent point of the axial projection of the measuring rod on the first valve seat sealing surface coincides with the center projection of the first valve seat sealing surface, and the tangent point of the axial projection of the measuring rod on the second valve seat sealing surface coincides with the center projection of the second valve seat sealing surface, the horizontal distance L1 between the center of the first valve seat sealing surface and the axis of the measuring rod in the first measurement state, and the horizontal distance L2 between the center of the second valve seat sealing surface and the axis of the measuring rod in the second measurement state, can be accurately calculated using trigonometric functions. Adding L1, L2, and the distance L between the positions of the measuring rod in the first and second measurement states yields the center distance between the first and second valve seat sealing surfaces. This invention allows for the precise determination of the distance between the sealing surfaces on both sides of a wedge-type single-gate valve. It solves the problems of low processing efficiency and difficult subsequent maintenance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the device of the present invention;

[0018] Figure 2 This is a schematic diagram of measuring the sealing surface of the first valve seat using the tooling of this invention;

[0019] Figure 3 yes Figure 2 View from direction A;

[0020] Figure 4 yes Figure 1 DD sectional view;

[0021] Figure 5 This is a schematic diagram of the main shaft structure;

[0022] Figure 6 yes Figure 2 Enlarged view of point I;

[0023] Figure 7 yes Figure 5 EE sectional view;

[0024] Figure 8 This is a cross-sectional view of the locking sleeve;

[0025] Figure 9 yes Figure 8 GG cross-sectional view;

[0026] Figure 10 This is a schematic diagram showing that the center of the first valve seat sealing surface and the axial projection of the measuring rod coincide at the tangent point on the projection of the first valve seat sealing surface.

[0027] Figure 11 yes Figure 5 F-direction view;

[0028] Figure 12 It is a sectional view of the reference body;

[0029] Figure 13 This is a sectional view of the main nut;

[0030] Figure 14 yes Figure 3 BB cross-sectional view;

[0031] Figure 15 yes Figure 3 CC section view;

[0032] Figure 16 This is an end view of the connecting flange plate.

[0033] In the diagram, 1. Main shaft, 2. Locking sleeve, 3. Measuring rod, 4. First valve seat sealing surface, 5. Second valve seat sealing surface, 6. Support guide pin, 7. Thrust bearing, 8. Reference body, 9. Pressure ring, 10. Valve body, 11. Main nut, 12. Anti-reverse screw, 13. Anti-reverse nut, 14. Stepped cylindrical pin, 15. Fastening bolt, 16. Chamfered pin, 17. Fastening nut, 18. Reference shoulder, 19. First positioning hole, 20. First bolt hole, 21. Second positioning hole, 22. Second bolt hole, 23. Guide groove, 24. Sector-shaped groove, 25. Threaded section, 26. Waist-shaped hole, 27. Reversing groove, 28. Measuring section, 29. Shoulder section, 30. Support guide section, 31. Horizontal limiting surface, 32. Connecting flange plate, 33. 34. Threaded hole section, 35. Countersunk hole section, 36. Support screw hole, 37. Limiting flange, 38. Cross groove, 39. Clearance hole section, 30. Retaining ring hole section. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0035] The connections mentioned in this invention are divided into fixed connections and detachable connections. Fixed connections, also known as non-detachable connections, include but are not limited to conventional fixed connection methods such as folded connections, riveted connections, adhesive connections, and welded connections. Detachable connections include but are not limited to conventional disassembly methods such as bolted connections, snap-fit ​​connections, pin connections, and hinged connections. When a specific connection method is not explicitly defined, it is assumed that at least one existing connection method can be found to achieve this function, and those skilled in the art can choose according to their needs. For example, a welded connection can be chosen for fixed connections, and a bolted connection can be chosen for detachable connections.

[0036] The present invention will be further described in detail below with reference to the accompanying drawings. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0037] Example: Figures 1 to 16 As shown, a wedge-type single-gate valve body sealing surface measuring fixture is provided. The valve body 10 is three-way shaped, and the valve body 10 is set to be left and right with the flow diameter. The valve body 10 is provided with a first valve seat sealing surface 4 and a second valve seat sealing surface 5 that are symmetrically arranged on the left and right. The measuring fixture includes a main shaft 1, a locking sleeve 2, a measuring rod 3, a reference body 8 and a main nut 11.

[0038] The reference body 8 is a tubular component. The outer periphery of the reference body 8 is provided with a reference shoulder 18. The outer periphery of the reference shoulder 18 is adapted to the through diameter of the valve body 10. The right end of the reference body 8 is connected to the right end flange of the valve body 10. The inner hole of the reference body 8 is an eccentric hole. The axis of the inner hole of the reference body 8 is directly above the axis of the reference shoulder 18. The main nut 11 is coaxially rotatably installed in the inner hole of the reference body 8, that is, the axis of the main nut 11 is directly above the axis of the reference shoulder 18.

[0039] The main spindle 1 includes a measuring section 28, a shoulder section 29, a support and guide section 30, and a threaded section 25, which are coaxially connected from left to right. The diameter of the shoulder section 29 is larger than that of the measuring section 28. The outer circumference of the shoulder section 29 is provided with a threaded structure. A reversing groove 27 is provided on the measuring section 28. A through oblong hole 26 is provided on the locking sleeve 2 along the radial direction. The locking sleeve 2 is sleeved on the measuring section 28 and threadedly connected to the shoulder section 29. The measuring rod 3 is a round rod that passes through the reversing groove 27. The oblong hole 26 and the reversing groove 27 are provided with at least one horizontal limiting surface 31, and the distance between the horizontal limiting surface 31 and the axis of the main shaft 1 is equal to the radius of the measuring rod 3. During measurement, the locking sleeve 2 presses the measuring rod 3 onto the horizontal limiting surface 31 through the side wall of the oblong hole 26. The threaded section 25 is threadedly connected to the main nut 11. The lower side of the support guide section 30 is provided with a guide groove 23 opened along the axial direction. The upper end of the support positioning pin 6 passes through the reference body 8 and is inserted and slidably engaged with the guide groove 23.

[0040] Let the included angle between the first valve seat sealing surface 4 and the second valve seat sealing surface 5 be 2θ, the distance between the inner hole axis of the reference body 8 and the axis of the reference shoulder 18 be a, and the radius of the auxiliary measuring rod 3 be r. Then a and r satisfy the following formula:

[0041] .

[0042] During measurement, by tightening the locking sleeve 2, the measuring rod 3 is pressed onto the horizontal limiting surface 31 through the side wall of the oblong hole 26. Since the distance between the horizontal limiting surface 31 and the axis of the main shaft 1 is equal to the radius of the measuring rod 3, the measuring rod 3 will necessarily be horizontal when measuring the center distance between the first valve seat sealing surface 4 and the second valve seat sealing surface 5, and the axis of the measuring rod 3 will necessarily intersect the axis of the main shaft 1 perpendicularly. Furthermore, since the centers of the first valve seat sealing surface 4 and the second valve seat sealing surface 5 are both on the axis of the valve body 10's diameter, the axis of the measuring rod 3 is directly above the centers of the first valve seat sealing surface 4 and the second valve seat sealing surface 5, at a distance of 'a'. When the main nut 11 is rotated, the main shaft 1, guided by the support positioning pin 6, It can remain stationary and only move left and right. Therefore, by rotating the main nut 11, the main shaft 1 can press the measuring rod 3 onto the first valve seat sealing surface 4 or the second valve seat sealing surface 5 through the end of the reversing groove 27, so that the outer circumferential surface of the measuring rod 3 is tangent to the first valve seat sealing surface 4 or the second valve seat sealing surface 5. The state when the measuring rod 3 is tangent to the first valve seat sealing surface 4 is defined as the first measurement state, and the state when the measuring rod 3 is tangent to the second valve seat sealing surface 5 is defined as the second measurement state. The distance between the position of the measuring rod 3 in the first measurement state and the position in the second measurement state is L. L can be accurately measured by the position change of the right end face of the main shaft 1 in the first measurement state and the second measurement state.

[0043] To accurately measure the center distance between the first valve seat sealing surface 4 and the second valve seat sealing surface 5, the tangent point of the axial projection of the measuring rod 3 on the first valve seat sealing surface 4 should coincide with the center projection of the first valve seat sealing surface 4, and the tangent point of the axial projection of the measuring rod 3 on the second valve seat sealing surface 5 should coincide with the center projection of the second valve seat sealing surface 5. The horizontal distance L1 between the center of the first valve seat sealing surface 4 and the axis of the measuring rod 3 in the first measurement state, and the horizontal distance L2 between the center of the second valve seat sealing surface 5 and the axis of the measuring rod 3 in the second measurement state can be accurately calculated using trigonometric functions. The center distance between the first valve seat sealing surface 4 and the second valve seat sealing surface 5 can be obtained by adding L1, L2 and L.

[0044] Therefore, the inner hole of the reference body 8 is set as an eccentric hole. Based on the wedge angle θ of the first valve seat sealing surface 4 and the second valve seat sealing surface 5 and the radius r of the measuring rod 3, the eccentricity a between the inner hole of the reference body 8 and the reference shoulder 18 is determined, so that the ratio of a to r is equal to the sine of the wedge angle θ. The center distance between the first valve seat sealing surface 4 and the second valve seat sealing surface 5 can be accurately measured by the above method.

[0045] The reversing groove 27 is formed by connecting two symmetrical fan-shaped cross-section grooves 24. One side of the fan-shaped cross-section groove 24 is a vertical surface, and the other side is a horizontal limiting surface 31. The fan-shaped openings of the two fan-shaped cross-section grooves 24 face opposite directions, and their central angles coincide, forming a square cross-section cavity with a side length of 2r. With this configuration, the measuring rod 3 can be inserted through the upper opening of the valve body 10, and pass through the waist-shaped hole 26 and the annular groove 27 while conforming to the vertical side of the two fan-shaped cross-section grooves 24. After passing through, the locking sleeve 2 is screwed on, and the measuring rod 3 can be turned from the side of the fan-shaped cross-section groove 24 closer to the vertical surface to conform to the horizontal limiting surface 31, and finally locked by the locking sleeve 2. This facilitates the insertion of the measuring rod 3 and makes it easier for the measuring rod 3 to be in a horizontal position.

[0046] The inner hole of the reference body 8 is composed of a clearance hole section 38, a retaining ring hole section 39, a countersunk hole section 34, and a threaded hole section 33, which are coaxially connected from left to right. The diameter of the threaded hole section 33 is larger than the diameter of the countersunk hole section 34, and the diameter of the countersunk hole section 34 is larger than the diameter of the retaining ring hole section 39. The main nut 11 is rotatably mounted inside the countersunk hole section 34. The outer circumference of the main nut 11 is provided with a limiting flange 36. The side wall of the threaded hole section 33 is provided with an internal thread structure. The outer circumference of the pressure ring 9 is threadedly connected to the inner circumference of the threaded hole section 33. Two thrust bearings 7 are sleeved on the main nut 11. The left end face of the limiting flange 36 abuts against the bottom surface of the countersunk hole section 34 through one thrust bearing 7, and the right end face of the limiting flange 36 abuts against the left end face of the pressure ring 9 through the other thrust bearing 7. The main nut 11 and the reference body 8 are rotatably engaged through the thrust bearings 7, which not only allows the main nut 11 to rotate flexibly but also enables it to bear axial thrust.

[0047] A locking screw hole is drilled and tapped between the connecting threads of the pressure ring 9 and the reference body 8. The locking screw 12 is threadedly engaged with the locking screw hole to prevent the pressure ring 9 from loosening.

[0048] The side wall of the reference body 8 is machined with a support screw hole 35. The outer periphery of the support guide pin 6 is threadedly engaged with the support screw hole 35. The support guide pin 6 is threadedly connected to the anti-reverse nut 13. The anti-reverse nut 13 is locked and pressed against the lower side of the reference body 8 to prevent the support guide pin 6 from loosening.

[0049] The right end of the reference body 8 is provided with a connecting flange plate 32. The connecting flange plate 32 has a first positioning hole 19, a second positioning hole 21, a first bolt hole 20, and a second bolt hole 22. The first positioning hole 19 is engaged with the flange hole corresponding to the right end flange of the valve body 10 through a stepped cylindrical pin 14. The second positioning hole 21 is engaged with the flange hole corresponding to the right end flange of the valve body 10 through a chamfered pin 16. The first bolt hole 20 and the second bolt hole 22 are both connected to the flange holes corresponding to the right end flange of the valve body 10 through fastening bolts 15 and fastening nuts 17. The flange of the valve body 10 makes it easier and more convenient to install and fix the reference body 8, and the stepped cylindrical pin 14 and the chamfered pin 16 facilitate the precise fit between the reference body 8 and the valve body.

[0050] The right end of the main nut 11 protrudes from the inner hole of the pressure ring 9. A cross groove 37 is provided on the right end face of the main nut 11. By inserting a tool into the cross groove 37 and then rotating it, the main nut can be rotated.

[0051] By ensuring that the tangent point of the axial projection of the measuring rod on the first valve seat sealing surface coincides with the center projection of the first valve seat sealing surface, and the tangent point of the axial projection of the measuring rod on the second valve seat sealing surface coincides with the center projection of the second valve seat sealing surface, the horizontal distance L1 between the center of the first valve seat sealing surface and the axis of the measuring rod in the first measurement state, and the horizontal distance L2 between the center of the second valve seat sealing surface and the axis of the measuring rod in the second measurement state, can be accurately calculated using trigonometric functions. Adding L1, L2, and the distance L between the positions of the measuring rod in the first and second measurement states yields the center distance between the first and second valve seat sealing surfaces. This invention allows for the precise determination of the distance between the sealing surfaces on both sides of a wedge-type single-gate valve. It solves the problems of low processing efficiency and difficult subsequent maintenance.

[0052] The above embodiments are merely illustrative examples of the present invention and do not limit its scope of protection. Those skilled in the art can make partial changes to them, as long as they do not exceed the spirit and essence of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A measuring fixture for the sealing surface of a wedge-type single-gate valve body, wherein the valve body (10) is provided with a first valve seat sealing surface (4) and a second valve seat sealing surface (5) that are symmetrically arranged on both sides, characterized in that: The measuring fixture includes a spindle (1), a locking sleeve (2), a measuring rod (3), a reference body (8), and a main nut (11). The reference body (8) is a tubular component. The outer periphery of the reference body (8) is provided with a reference shoulder (18). The outer periphery of the reference shoulder (18) is adapted to the diameter of the valve body (10). The right end of the reference body (8) is connected to the right end flange of the valve body (10). The inner hole axis of the reference body (8) is directly above the axis of the reference shoulder (18). A main nut (11) is coaxially rotatably installed in the inner hole of the reference body (8), making the inner hole of the reference body (8) an eccentric hole. The main spindle (1) includes a measuring section (28), a shoulder section (29), a support guide section (30), and a threaded section (25) connected coaxially from left to right. The outer periphery of the shoulder section (29) is provided with a threaded structure. A reversing groove (27) is provided on the measuring section (28). A through waist-shaped hole (26) is provided on the locking sleeve (2) along the radial direction. The locking sleeve (2) is fitted onto the measuring section (28) and threadedly connected to the shoulder section (29). The measuring rod (3) is a round rod. The measuring rod (3) passes through the reversing groove (27) and the waist-shaped hole (26) to reverse direction. The groove (27) has at least one horizontal limiting surface (31), and the distance between the horizontal limiting surface (31) and the axis of the main shaft (1) is equal to the radius of the measuring rod (3). During measurement, the locking sleeve (2) presses the measuring rod (3) onto the horizontal limiting surface (31) through the side wall of the waist-shaped hole (26). The threaded section (25) is threadedly connected to the main nut (11). The lower side of the support guide section (30) is provided with a guide groove (23) opened along the axial direction. The upper end of the support guide pin (6) passes through the reference body (8) and is inserted and slidably engaged with the guide groove (23). Let the angle between the first valve seat sealing surface (4) and the second valve seat sealing surface (5) be 2θ, the distance between the inner hole axis of the reference body (8) and the axis of the reference shoulder (18) be a, and the radius of the auxiliary measuring rod (3) be r. Then a and r satisfy the following formula: ； By rotating the main nut (11), the spindle (1) can press the measuring rod (3) onto the first valve seat sealing surface (4) or the second valve seat sealing surface (5) through the end of the reversing groove (27), so that the outer circumferential surface of the measuring rod (3) is tangent to the first valve seat sealing surface (4) or tangent to the second valve seat sealing surface (5). The state when the measuring rod (3) is tangent to the first valve seat sealing surface (4) is defined as the first measurement state, and the state when the measuring rod (3) is tangent to the second valve seat sealing surface (5) is defined as the second measurement state. The distance between the position of the measuring rod (3) in the first measurement state and the position in the second measurement state is L. L can be accurately measured by the position change of the right end face of the spindle (1) in the first measurement state and the second measurement state.

2. The wedge-type single-gate valve body sealing surface measuring fixture according to claim 1, characterized in that: The reversing groove (27) is formed by connecting two symmetrical fan-shaped cross-section grooves (24). One side of the fan-shaped cross-section groove (24) is a vertical surface, and the other side is a horizontal limiting surface (31). The fan-shaped openings of the two fan-shaped cross-section grooves (24) face opposite directions. The central corners of the two fan-shaped cross-section grooves (24) coincide, and the overlapping part forms a square cross-section cavity with a side length of 2r.

3. The wedge-type single-gate valve body sealing surface measuring fixture according to claim 1, characterized in that: The inner hole of the reference body (8) is composed of a clearance hole section (38), a retaining ring hole section (39), a countersunk hole section (34) and a threaded hole section (33) connected coaxially from left to right. The diameter of the threaded hole section (33) is larger than the diameter of the countersunk hole section (34), and the diameter of the countersunk hole section (34) is larger than the diameter of the retaining ring hole section (39). The main nut (11) is rotatably set in the countersunk hole section (34). The outer circumference of the main nut (11) is provided with a limiting flange (36). The outer circumference of the pressure ring (9) is threadedly connected to the inner circumference of the threaded hole section (33). Two thrust bearings (7) are sleeved on the main nut (11). The left end face of the limiting flange (36) abuts against the bottom surface of the countersunk hole section (34) through one thrust bearing (7), and the right end face of the limiting flange (36) abuts against the left end face of the pressure ring (9) through another thrust bearing (7).

4. The wedge-type single-gate valve body sealing surface measuring fixture according to claim 3, characterized in that: A locking screw hole is drilled and tapped between the connecting threads of the pressure ring (9) and the reference body (8), and the locking screw (12) is threadedly engaged with the locking screw hole.

5. The wedge-type single-gate valve body sealing surface measuring fixture according to claim 3, characterized in that: The side wall of the reference body (8) is machined with a support screw hole (35). The outer periphery of the support guide pin (6) is threadedly engaged with the support screw hole (35). The support guide pin (6) is threadedly connected with the anti-reverse nut (13). The anti-reverse nut (13) is locked and pressed against the lower side of the reference body (8).

6. The wedge-type single-gate valve body sealing surface measuring fixture according to claim 3, characterized in that: The right end of the reference body (8) is provided with a connecting flange plate (32). The connecting flange plate (32) is provided with a first positioning hole (19), a second positioning hole (21), a first bolt hole (20) and a second bolt hole (22). The first positioning hole (19) is engaged with the flange hole corresponding to the right end flange of the valve body (10) by a stepped cylindrical pin (14). The second positioning hole (21) is engaged with the flange hole corresponding to the right end flange of the valve body (10) by a chamfered pin (16). The first bolt hole (20) and the second bolt hole (22) are both connected to the flange hole corresponding to the right end flange of the valve body (10) by fastening bolts (15) and fastening nuts (17).

7. A measuring fixture for the sealing surface of a wedge-type single-gate valve body according to any one of claims 1-6, characterized in that: The right end of the main nut (11) protrudes from the inner hole of the pressure ring (9), and a cross groove (37) is provided on the right end face of the main nut (11).

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