Pressure testing tool for high-pressure safety pressure reducing valve

Abstract

The utility model provides a pressure test tool for a high-pressure safety pressure reducing valve. The pressure test tool comprises a fixed block, a connecting pipe and a clamping flange, one end of the connecting pipe is connected with the welding flange and is provided with a convex plate; a bump is arranged at one end of the welding flange connecting pipeline; a first clamping table and a second clamping table are arranged in the fixing block and used for being connected with the protruding plate and the protruding block in a clamped mode correspondingly, and the connecting pipe and the welding flange are connected and fixed. A first sealing ring is connected between the convex plate and the convex block; the fixing block is formed by splicing a left positioning block and a right positioning block which are oppositely clamped; the other end of the connecting pipe is connected with the clamping flange; the clamping flange is matched with the pressure testing machine and can be installed on the pressure testing machine. When the safety valve needs to be subjected to pressure testing, the welding flange does not need to be cut off, and only the welding flange and the connecting pipe need to be fixed to the fixing block, connected into a whole and installed on a pressure testing machine for pressure testing; and after the pressure test is completed, the connecting pipe is detached from the welding flange, so that the cost is reduced, and the efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure test of pressure reducing valves, in particular to a pressure test tooling for a high-pressure safety pressure reducing valve. Background Technique

[0002] Each outlet pipeline of the compressor with natural gas medium and each oil separator device usually install high-pressure pilot-operated safety valves to ensure the normal operation of the compressor and the safety of the device. The connection mode between the high-pressure pilot-operated safety valve and the pipeline is generally flange bolt connection, the working pressure is 38 MPa, and the corresponding set pressure is 40.48 Mpa.

[0003] When the pipeline medium pressure reaches the set pressure, the main valve will automatically open for pressure reduction. During each pressure reduction process, due to the relatively high pressure of the pipeline, a very large impact will be generated between the main valve spool and the valve seat. This vibration is likely to cause the connection bolts to loosen, resulting in medium leakage. Therefore, the connection mode of the safety valve will be changed to welded flange connection. As Figure 1 shown, the connection end of this welded flange and the pipeline only has a convex block, and there is no connection hole on the convex block. It is fixed on the pipeline through a clamp structure, which can solve the loosening problem. However, the safety valve needs to be pressure-tested before use, and this welded flange cannot be clamped and fixed on the pressure test tooling. Therefore, it will be cut off first, and then a flange that can be clamped will be welded on the high-pressure pilot-operated safety valve for pressure test. After the pressure test is qualified, the test flange that can be clamped still needs to be processed into the original welded flange size. In this way, when each safety valve is tested, not only the cost is high, resulting in waste of materials, but also the efficiency is low. Content of the Utility Model

[0004] To solve the technical problems in the background technique, the utility model discloses a pressure test tooling for a high-pressure safety pressure reducing valve.

[0005] The utility model provides a pressure test tooling for a high-pressure safety pressure reducing valve, which includes a fixed block, a connecting pipe and a clamping flange;

[0006] One end of the connecting pipe is connected to the welded flange, and a convex plate is provided at this end;

[0007] One end of the welded flange connecting the pipeline is provided with a convex block;

[0008] The fixed block is provided with a first clamping platform and a second clamping platform, which are respectively used for clamping the convex plate and the convex block to realize the connection and fixation of the connecting pipe and the welded flange;

[0009] A first sealing ring is connected between the convex plate and the convex block;

[0010] The fixed block is composed of a left positioning block and a right positioning block that are clamped together;

[0011] The other end of the connecting pipe is connected to the clamping flange;

[0012] The clamping flange is matched with the test press and can be installed on the test press.

[0013] When the safety valve needs to be pressure-tested, it is not necessary to cut off the welded flange. Only need to fix the welded flange and the connecting pipe on the fixing block, connect them into a whole, and install them on the test press for pressure testing; after the pressure testing is completed, disassemble the connecting pipe from the welded flange, thus reducing the cost and improving the efficiency; the structural setting of the fixing block makes it possible to install the welded flange and the connecting pipe on the left positioning block first and then close the right positioning block when connecting; when disassembling, only need to separate the left positioning block and the right positioning block, so that the disassembly and assembly of the welded flange and the connecting pipe are simple, convenient and efficient.

[0014] Generally, the convex block and the convex plate are in the shape of a flat plate. During the process of being clamped into the first clamping platform or the second clamping platform, there is always sliding friction, resulting in difficult installation. Based on this, a further improvement is that during the disassembly and assembly process of the right positioning block and the left positioning block, the welded flange is composed of a first straight pipe section and a convex block connected to each other, and the connection part is inclined and transitioned, and this transition part is set as the first transition block; the connecting pipe includes a second straight pipe section, and the convex plate is arranged at one end of the second straight pipe section, and the connection part is inclined and transitioned, and this transition part is set as the second transition block; the first clamping platform is also arranged obliquely, and its inclination angle is the same as that of the second transition block; the second clamping platform is also arranged obliquely, and its inclination angle is the same as that of the first transition block. With such a setting, there is always a gap between the first clamping platform and the second transition block during the connection process of the first clamping platform and the second transition block, and there is always a gap between the second clamping platform and the first transition block during the connection process of the second clamping platform and the first transition block, so that it is convenient for the disassembly and assembly of the welded flange, the connecting pipe and the fixing block.

[0015] Due to the existence of machining errors and assembly errors, there will be a gap between the first clamping platform and the second transition block, and there will also be a gap between the second clamping platform and the first transition block, so that the welded flange and the connecting pipe can move axially in the fixing block, resulting in leakage. Based on this, a further improvement is that a backing plate is also arranged on the first clamping platform, and the backing plate is clamped between the first clamping platform and the second transition block.

[0016] Since relative radial movement is likely to occur between the welded flange and the connecting pipe, this will cause wear to the first sealing ring, affect the sealing performance and the pressure test result. Based on this, a further improvement is that a positioning groove is opened at one end of the convex plate connecting the welded flange; the convex block is clamped in the positioning groove.

[0017] To facilitate the disassembly and assembly of the connecting pipe and the clamping flange, a further design is that the other end of the connecting pipe is a stud, which is threadedly connected to the clamping flange.

[0018] If the clamping flange is designed as a flat plate type, when machining the threaded hole, the structural strength of the clamping flange will be reduced, affecting the stability of the pressure test. Based on this, a further improvement is that: a convex column is provided on one side of the clamping flange connecting the pipe; the threaded hole for threadedly connecting the stud on the clamping flange is arranged at the center position of the convex column, one end of which penetrates through the convex column, and the thread depth is greater than the length of the convex column.

[0019] To improve the sealing performance between the clamping flange and the pressure testing machine, a second sealing ring is clamped on the side of the clamping flange facing away from the pipe and is sealingly connected to the pressure testing machine; the second sealing ring is provided with three concentrically arranged ones, and its diameter increases from the inside to the outside. Description of the Drawings

[0020] The following further describes the present utility model in conjunction with the drawings and embodiments.

[0021] Figure 1 is the front view of the present utility model, with a partial cross-section;

[0022] Figure 2 is Figure 1 the enlarged view at A in

[0023] Figure 3 is the structural schematic diagram of the fixing block;

[0024] Figure 4 is the top view cross-section of the fixing block;

[0025] Figure 5 is the front view cross-section of the fixing block;

[0026] Figure 6 is the front view cross-section of the fixing block when it is separated from the welding flange and the pipe;

[0027] In the figure: 1, fixing block; 2, pipe; 3, clamping flange; 4, welding flange; 5, first sealing ring; 6, backing plate; 7, second sealing ring; 8, pressure testing machine; 11, first clamping platform; 12, second clamping platform; 13, left positioning block; 14, right positioning block; 15, first socket hole; 16, second socket hole; 17, first clamping hole; 18, second clamping hole; 21, convex plate; 22, second straight pipe section; 23, second transition block; 24, positioning groove; 25, stud; 31, convex column; 32, base; 41, convex block; 42, first straight pipe section; 43, first transition block. Detailed Description of the Preferred Embodiment

[0028] Now, the present utility model will be further described in detail in conjunction with the drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0029] As Figure 1 and Figure 2As shown in the figure, the utility model discloses a pressure test tooling for a high-pressure safety pressure reducing valve, which includes a fixing block 1, a connecting pipe 2 and a clamping flange 3, and is used to be connected with a welding flange 4 as a whole.

[0030] The welding flange 4 is composed of a first straight pipe section 42 and a convex block 41 which are connected to each other. The connection part between them has an inclined transition, and this transition part is set as a first transition block 43. The other end of the first straight pipe section 42 is connected to the valve body of the safety valve, and the convex block 41 is used to connect with the pipeline.

[0031] The connecting pipe 2 includes a second straight pipe section 22, one end of which is provided with a convex plate 21 protruding, and the other end is provided with a coaxial stud 25. The connection part between the convex plate 21 and the second straight pipe section 22 has an inclined transition, and this transition part is set as a second transition block 23.

[0032] As Figure 5 shown, from one end to the other end in the fixing block 1, there are successively arranged a first socket hole 15, a first clamping hole 17, a second clamping hole 18 and a second socket hole 16. The first socket hole 15 and the first clamping hole 17 have an inclined transition, and the inclined part forms a first clamping platform 11. The first socket hole 15 is used to socket the second straight pipe section 22, and the first clamping hole 17 is used to socket the convex plate 21; the second transition block 23 has the same inclined angle as the first clamping platform 11, so that when the connecting pipe 2 is clamped to the fixing block 1, the second transition block 23 fits with the first clamping platform 11. The second socket hole 16 and the second clamping hole 18 have an inclined transition, and the inclined part forms a second clamping platform 12. The second socket hole 16 is used to socket the first straight pipe section 42, and the second clamping hole 18 is used to socket the convex block 41; the first transition block 43 has the same inclined angle as the second clamping platform 12, so that when the welding flange 4 is clamped to the fixing block 1, the first transition block 43 fits with the second clamping platform 12.

[0033] A first sealing ring 5 is clamped on the outer end face of the convex plate 21, so that a sealed connection is formed between the convex plate 21 and the convex block 41. A positioning groove 24 is opened at one end of the convex plate 21 connected to the welding flange 4; the convex block 41 is clamped in the positioning groove 24. In this way, the positioning connection between the convex plate 21 and the convex block 41 is realized, avoiding the generation of radial displacement between the convex plate 21 and the convex block 41, causing wear to the first sealing ring 5, affecting the sealing performance and the pressure test result.

[0034] Moreover, a backing plate 6 is also arranged on the first clamping platform 11, so that the backing plate 6 is clamped between the first clamping platform 11 and the second transition block 23. The backing plate 6 is used for filling to eliminate the axial clearance between the welding flange 4, the connecting pipe 2 and the fixing block 1, and avoid the axial movement of the welding flange 4 and the connecting pipe 2 in the fixing block 1.

[0035] As Figure 3 and Figure 4As shown, the fixed block 1 is axially cut along the inner hole into a left positioning block 13 and a right positioning block 14. A plane is cut at a position where the left positioning block 13 is away from the right positioning block 14, and four uniformly distributed countersunk holes are provided. A threaded hole matching the countersunk hole is provided on the end face of the right positioning block 14 connecting the left positioning block 13. The bolt passes through the countersunk hole and is threadedly connected to the threaded hole to realize the connection and fixation of the left positioning block 13 and the right positioning block 14.

[0036] The other end of the connecting pipe 2 is provided with a coaxial stud 25, and the clamping flange 3 is provided with a threaded hole threadedly connected to the stud 25. The clamping flange 3 includes a circular plate-shaped base 32, and the upper end face of the base 32 is provided with a coaxial and upwardly convex convex column 31; the threaded hole is provided at the central position of the convex column 31, one end thereof penetrates through the convex column 31, and the other end extends downward and crosses the upper end face of the base 32, so that the thread depth is greater than the length of the convex column 31. Moreover, the lower end of the threaded hole is located at a position close to the upper end face of the base 32, so that the structural strength of the clamping flange 3 is not affected by the threaded hole, thereby ensuring the normal progress of the pressure test.

[0037] The lower end face of the clamping flange 3 is clamped with a second sealing ring 7 and is hermetically connected to the test press 8; the second sealing ring 7 is provided with three concentrically arranged ones, and its diameter increases from the inside to the outside, so as to improve the sealing performance between the clamping flange 3 and the test press 8.

[0038] The beneficial effects of the present utility model are as follows: 1. When the safety valve needs to be pressure-tested, it is not necessary to cut off the welding flange 4. It only needs to fix the welding flange 4 and the connecting pipe 2 on the fixed block 1, connect them into a whole, and install them on the test press 8 for pressure testing; after the pressure test is completed, the connecting pipe 2 can be disassembled from the welding flange 4, thereby reducing the cost and improving the efficiency; 2. The structural setting of the fixed block 1 enables the welding flange 4 and the connecting pipe 2 to be installed on the left positioning block 13 first and then the right positioning block 14 is closed when connecting; when disassembling, it only needs to separate the left positioning block 13 and the right positioning block 14, so that the disassembly and assembly operations of the welding flange 4 and the connecting pipe 2 are simple, convenient and efficient; 3. As Figure 6 shown, there is always a distance between the first clamping platform 11 and the second transition block 23 during the process of connecting the second transition block 23, and there is always a distance between the second clamping platform 12 and the first transition block 43 during the process of connecting the first transition block 43, so as to facilitate the disassembly and assembly of the welding flange 4, the connecting pipe 2 and the fixed block 1.

[0039] Inspired by the ideal embodiments of the present utility model described above, through the above description, relevant staff can completely make various changes and modifications within the scope not deviating from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A high-pressure safety pressure reducing valve pressure testing tool, characterized in that: It comprises a fixing block (1), a connecting pipe (2) and a clamping flange (3); One end of the pipe (2) is connected to the welding flange (4), and a raised convex plate (21) is provided at this end; One end of the welding flange (4) connected to the pipeline is provided with a protrusion (41); The fixing block (1) is provided with a first clamping platform (11) and a second clamping platform (12), which are used to clamp the convex plate (21) and the convex block (41) respectively, so as to realize the connection and fixation between the pipe (2) and the welding flange (4); A first sealing ring (5) is connected between the convex plate (21) and the convex block (41); The fixing block (1) is composed of a left positioning block (13) and a right positioning block (14) which are clamped together. The other end of the connecting pipe (2) is connected to the clamping flange (3); The clamping flange (3) matches the pressure testing machine (8) and can be installed on the pressure testing machine (8).

2. A high-pressure safety pressure reducing valve pressure testing tool according to claim 1, characterized in that: The welding flange (4) is composed of a first straight pipe section (42) and a convex block (41) connected to each other, and the connection portion thereof is inclinedly transitioned, and the transition portion is set as a first transition block (43); The connecting pipe (2) comprises a second straight pipe section (22), the convex plate (21) is arranged at one end of the second straight pipe section (22), and the connection portion thereof is inclinedly transitioned, and the transition portion is provided as a second transition block (23); The first card platform (11) is also arranged in an inclined manner, and its inclination angle is consistent with that of the second transition block (23); The second clamping platform (12) is also arranged in an inclined manner, and its inclination angle is consistent with that of the first transition block (43).

3. A high-pressure safety pressure reducing valve pressure testing tool according to claim 2, characterized in that: A pad (6) is also provided on the first clamping platform (11), and the pad (6) is clamped between the first clamping platform (11) and the second transition block (23).

4. A high-pressure safety pressure reducing valve pressure testing tool according to claim 2, characterized in that: A positioning groove (24) is formed at one end of the convex plate (21) connected to the welding flange (4); The protrusion (41) is snap-fitted into the positioning groove (24).

5. A high-pressure safety pressure reducing valve pressure testing tool according to claim 2, characterized in that: The other end of the connecting pipe (2) is a stud (25) which is threadedly connected to the clamping flange (3).

6. A high-pressure safety pressure reducing valve pressure testing tool according to claim 1, characterized in that: A protruding column (31) is provided on one side of the clamping flange (3) connected to the pipe (2); The threaded hole of the clamping flange (3) for threaded connection with the stud (25) is arranged at the center of the boss (31), one end of the clamping flange (3) passes through the boss (31), and the thread depth is greater than the length of the boss (31).

7. A high-pressure safety pressure reducing valve pressure testing tool according to claim 6, characterized in that: A second sealing ring (7) is clamped on the side of the clamping flange (3) facing away from the connecting pipe (2) and is sealedly connected to the pressure testing machine (8); The second sealing rings (7) are provided in three concentric arrangements, and their diameters increase from the inside to the outside.

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