Long-life diaphragm valve with anti-overload torque limiting mechanism

Abstract

The application discloses a long-service-life diaphragm valve with an anti-overload torque limiting mechanism and relates to the field of pipeline intercepting equipment. The valve body is provided with through holes at both ends, a cavity is formed in the valve body, the cavity is communicated with the through holes at both ends of the valve body, mounting holes are formed in the valve body, the mounting holes are communicated with the cavity, a valve cover is mounted at the mounting holes of the valve body, the mounting holes are closed by the valve cover, a valve rod is slidably arranged on the valve cover, diaphragms are arranged in the mounting holes, the valve rod drives the diaphragms to separate the through holes at both ends of the cavity, a plurality of valve covers, valve rods and diaphragms are arranged in the corresponding mounting holes, a driving assembly is mounted on the valve body, the driving assembly drives all the valve rods to synchronously slide, and when the valve rod slides towards the cavity, all the diaphragms abut against each other to close the cavity. The application has the effect of prolonging the service life of the diaphragm valve.

Description

Technical Field

[0001] This application relates to the field of pipeline shut-off equipment, and in particular to a long-life diaphragm valve with an overload torque limiting mechanism. Background Technology

[0002] A diaphragm valve is a gate valve that uses a diaphragm as the opening and closing element to close the flow channel, cut off the fluid, and separate the valve body cavity from the valve cover cavity. It has a simple structure, good sealing and corrosion resistance, and low fluid resistance. It is often used for low-pressure, low-temperature, highly corrosive, and media containing suspended substances.

[0003] The existing Chinese invention patent with publication number CN106885011A discloses a nuclear-grade manual diaphragm valve, including a valve body, a valve stem, a valve cover, and a diaphragm. The valve body and the valve cover are respectively provided with a first limiting boss and a second limiting boss at their edges. The first limiting boss and the second limiting boss are rigidly sealed together and surround to form an internal cavity. The diaphragm is placed in the internal cavity, and its edge abuts against and is fixed to the first limiting boss and the second limiting boss. The valve stem passes through the valve cover and is connected to the middle of the diaphragm.

[0004] Existing diaphragm valves seal the cavity inside the valve body by driving the diaphragm to deform. The deformation of the diaphragm is relatively large, which can easily lead to diaphragm damage after long-term use. This can cause corrosion and damage to the internal mechanical structure of the diaphragm valve, resulting in a reduction in the service life of the diaphragm valve. Summary of the Invention

[0005] To improve the service life of diaphragm valves, this application provides a long-life diaphragm valve with an overload torque limiting mechanism.

[0006] The long-life diaphragm valve with an overload torque limiting mechanism provided in this application adopts the following technical solution:

[0007] A long-life diaphragm valve with an overload torque limiting mechanism includes a valve body with through holes at both ends and a cavity inside the valve body that connects to the through holes at both ends. Mounting holes are provided on the valve body and connect to the cavity. A valve cover is mounted on the valve body at the mounting holes, closing the mounting holes. A valve stem is slidably mounted on the valve cover, and a diaphragm is disposed within the mounting holes. The valve stem slides, driving the diaphragm to separate the through holes at both ends of the cavity. Several mounting holes are provided circumferentially on the valve body, with multiple mounting holes corresponding to the valve cover, valve stem, and diaphragm. A drive assembly is mounted on the valve body, driving all valve stems to slide synchronously. When the valve stems slide towards the cavity, they cause all diaphragms to abut against each other, closing the cavity.

[0008] By adopting the above technical solution, the cavity is divided by the deformation of multiple diaphragms, thereby achieving the closure of the flow channel and the cutoff of fluid. The deformation of multiple diaphragms when closing the flow channel is smaller than that of a single diaphragm in the prior art, thus reducing the deformation of the diaphragms, reducing the probability of damage due to excessive deformation, and improving the service life of the diaphragms and the diaphragm valve. During the opening and closing process of multiple diaphragms, the synchronous opening and closing of multiple diaphragms will affect the deformation of the diaphragm valve. The synchronous driving of all valve stems by the drive assembly can solve the problem of poor synchronization when multiple diaphragms control the opening and closing of the flow channel.

[0009] Preferably, the drive assembly includes a drive ring block and a drive connecting rod. The drive ring block is rotatably mounted on the valve cover. One end of the drive connecting rod is hinged to the side wall of the drive ring block, and the other end is hinged to the side wall of the valve stem. All drive ring blocks on the valve cover are connected end to end.

[0010] By adopting the above technical solution, the rotation of the drive ring blocks drives all the drive linkages to rotate and slide, thereby enabling all valve stems to slide synchronously and achieving synchronous drive of all diaphragms. The drive ring blocks can be separated to facilitate the disassembly and maintenance of individual valve covers.

[0011] Preferably, the drive assembly includes a drive ring block and a drive block. The drive ring block is slidably disposed on the valve cover and slides toward or away from the valve stem. The drive block is fixed on the drive ring block. A wedge-shaped surface is formed at the end of the drive block away from the drive ring block. The wedge-shaped surface abuts against the end of the valve stem away from the valve body. All drive ring blocks on the valve cover are connected end to end.

[0012] By adopting the above technical solution, the connection between the drive ring blocks drives all drive blocks to slide when the drive ring blocks slide, thereby enabling the wedge-shaped surface of the drive blocks to drive all valve stems to slide synchronously, achieving synchronous drive of all diaphragms. The drive ring blocks can be separated to facilitate the disassembly and maintenance of individual valve covers.

[0013] Preferably, a splicing block is provided at one end of the drive ring block along its length, and a splicing groove is provided at the other end of the drive ring block along its length. The splicing block at one end of the drive ring block is inserted into the splicing groove of the adjacent drive ring block.

[0014] By adopting the above technical solution, the splicing blocks and splicing slots can improve the robustness of the connection between the drive ring blocks.

[0015] Preferably, an arc-shaped cone block is installed at one end of the valve stem inserted into the valve body.

[0016] By adopting the above technical solution, the setting of the arc-shaped cone block can increase the area of ​​the valve stem driving the diaphragm deformation, improve the sealing effect, and at the same time reduce the pressure of the valve stem on the diaphragm, thus reducing the probability of the valve stem puncturing the diaphragm.

[0017] Preferably, the arc-shaped cone block is provided with a plurality of slots and a plurality of inserts, the slots and inserts being adapted to each other, and the inserts of the arc-shaped cone block being inserted into the slots of adjacent arc-shaped cone blocks.

[0018] By adopting the above technical solution, the setting of grooves and blocks can make the bonding surface of the diaphragm uneven during bonding, thereby improving the sealing performance and reducing the probability of leakage due to an overly smooth bonding surface of the diaphragm.

[0019] Preferably, the valve stem is provided with a guide groove, and the valve cover is fixed with a guide block corresponding to the guide groove, the guide block being slidably disposed in the guide groove.

[0020] By adopting the above technical solution, the guide groove and guide block can guide the sliding of the valve stem, and at the same time restrict the rotation of the valve stem, thereby reducing the probability that the insert on the arc-shaped cone block cannot be matched with the adjacent insert after the valve stem rotates.

[0021] Preferably, the valve body is fixed with a flange at the mounting hole, and the flange is circumferentially rotatably provided with a cleaver, which rotatably clamps the valve cover on the side away from the valve body.

[0022] By adopting the above technical solution, the design of the chuck can reduce the probability of the valve cover detaching from the valve body.

[0023] Preferably, a drive rod is provided on the valve body corresponding to the claw, and the drive rod drives the claw to rotate by sliding.

[0024] By adopting the above technical solution, the drive rod can be set up to facilitate the rotation of the chuck.

[0025] Preferably, the valve body has a through hole and mounting plates are fixed at both ends. The mounting plates have bolt holes, the number of which is the same as the number of mounting holes. The end of the drive rod away from the pawl extends to the bolt hole.

[0026] By adopting the above technical solution, the drive rod extends to the bolt hole, which can restrict the removal of the valve cover from the valve body when the valve body is in the installation state.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. By dividing the cavity through the deformation of multiple diaphragms, the flow channel is closed and the fluid is cut off. The deformation of multiple diaphragms when closing the flow channel is smaller than that of a single diaphragm in the prior art, thereby reducing the deformation of the diaphragms, reducing the probability of damage due to excessive deformation, and improving the service life of the diaphragms and the diaphragm valve. During the opening and closing process of the multi-layer diaphragm deformation, the synchronous opening and closing of the multi-layer diaphragms will affect the deformation of the diaphragm valve. The synchronous driving of all valve stems by the drive assembly can solve the problem of poor synchronization when multiple diaphragms control the flow channel opening and closing.

[0029] 2. The arc-shaped cone block can increase the area of ​​the valve stem driving the diaphragm deformation, improve the sealing effect, and at the same time reduce the pressure of the valve stem on the diaphragm, thus reducing the probability of the valve stem puncturing the diaphragm.

[0030] 3. The groove and insert design allows the bonding surface of the diaphragm to be uneven during bonding, thereby improving the sealing performance and reducing the probability of leakage due to an overly smooth bonding surface of the diaphragm.

[0031] 4. By installing bolts in the bolt holes to drive the chucks to rotate and clamp onto the valve cover, the valve cover is reinforced while the valve body is connected to the pipeline, making it impossible to open the valve cover directly. At the same time, the drive rod abutting against the bolt can also prevent the nut on the bolt from coming off. Attached Figure Description

[0032] Figure 1 This is an isometric schematic diagram of the overall structure of Embodiment 1 of this application;

[0033] Figure 2 This is a schematic diagram of the cross-sectional structure of Embodiment 1 of this application;

[0034] Figure 3 This is an isometric schematic diagram of the overall structure of Embodiment 1 of this application from another perspective;

[0035] Figure 4 for Figure 3 Enlarged view of section A in the middle;

[0036] Figure 5 for Figure 3 Enlarged view of section B in the middle;

[0037] Figure 6 This is an isometric schematic diagram of the overall structure of Embodiment 2 of this application;

[0038] Reference numerals: 1. Valve body; 2. Through hole; 3. Cavity; 4. Mounting hole; 5. Valve cover; 6. Valve stem; 7. Diaphragm; 8. Drive assembly; 81. Drive ring block; 82. Drive connecting rod; 83. Drive block; 9. Sliding track; 10. Track block; 11. Splicing block; 12. Splicing groove; 13. Splicing spring; 14. Splicing bolt; 15. Arc-shaped cone block; 16. Groove; 17. Insert; 18. Guide groove; 19. Guide block; 20. Flange; 21. Claw; 22. Drive rod; 23. Mounting plate; 24. Bolt hole; 25. Abutment slide; 251. Fixing part; 252. Sliding part; 26. Annular groove; 27. Annular pressure block; 28. Wedge-shaped surface. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail. Example

[0040] This application discloses a long-life diaphragm valve with an overload torque limiting mechanism, referring to... Figure 1 and Figure 2 The system includes a valve body 1, with through holes 2 at both ends and a cavity 3 inside the valve body 1, the cavity 3 connecting to the through holes 2 at both ends of the valve body 1. Mounting holes 4 are provided on the valve body 1, connecting to the cavity 3. A valve cover 5 is mounted on the valve body 1 at the mounting holes 4, closing the mounting holes 4. A valve stem 6 is slidably mounted on the valve cover 5. A diaphragm 7 is provided inside the mounting holes 4, and the sliding of the valve stem 6 drives the diaphragm 7 to separate the through holes 2 at both ends of the cavity 3. Several mounting holes 4 are provided circumferentially on the valve body 1; in this embodiment, four mounting holes 4 are provided, and the valve cover 5, valve stem 6, and diaphragm 7 are each provided with four mounting holes 4. A drive assembly 8 is mounted on the valve body 1, driving all valve stems 6 to slide synchronously, with the valve stems 6 facing the cavity. When sliding within cavity 3, all diaphragms 7 abut against each other, closing cavity 3. The cavity 3 is separated by the deformation of multiple diaphragms 7, thereby achieving the closure of the flow channel and cutting off the fluid. The deformation of multiple diaphragms 7 when closing the flow channel is smaller than the deformation of a single diaphragm 7 when closing the flow channel in the prior art, thereby reducing the deformation of diaphragms 7, reducing the probability of damage to diaphragms 7 due to excessive deformation, and improving the service life of diaphragms 7, as well as the service life of diaphragm valve. During the opening and closing process of multiple diaphragms 7, the synchronous opening and closing of multiple diaphragms 7 will affect the deformation of diaphragm valve. The synchronous driving of all valve stems 6 by the drive assembly 8 can solve the problem of poor synchronization when multiple diaphragms 7 control the opening and closing of the flow channel.

[0041] Reference Figure 1The drive assembly 8 includes a drive ring block 81 and a drive connecting rod 82. The drive ring block 81 is rotatably mounted on the valve cover 5. In this embodiment, the drive ring block 81 is a quarter-circle arc. A sliding track 9 is fixed on the valve cover 5. A track block 10 with a T-shaped cross-section is fixed on the inner wall of the drive ring. The track block 10 is slidably mounted on the sliding track 9. In this embodiment, the track block 10 slides along the rotation direction of the drive ring block 81. One end of the drive connecting rod 82 is hinged to the side wall of the drive ring block 81, and the other end is hinged to the side wall of the valve stem 6. The sliding rotation of the drive ring block 81 drives the drive connecting rod 82 to rotate, and the drive connecting rod 82 drives the valve stem 6 to slide on the valve cover 5. The movement causes the diaphragm 7 to deform and block or open the internal flow channel of the valve body 1. The drive ring blocks 81 on the valve cover 5 are connected end to end, forming a complete arc. By rotating the arc, all valve stems 6 slide synchronously, driving all diaphragms 7 synchronously and improving the synchronicity of the diaphragm 7 drive. The drive ring blocks 81 can be separated to facilitate the disassembly and maintenance of individual valve covers 5. After the drive ring blocks 81 are spliced ​​into an arc, a handle or an external gear ring can be fitted around the drive ring blocks 81. The drive ring blocks 81 can be manually driven to rotate by fitting the handle, and the drive ring blocks 81 can be electrically driven by connecting to a gear motor by fitting the external gear ring.

[0042] Reference Figure 1 , Figure 3 and Figure 4 A splicing block 11 is provided at one end of the drive ring block 81 along its length, and a splicing groove 12 is provided at the other end of the drive ring block 81 along its length. The splicing block 11 at one end of the drive ring block 81 is inserted into the splicing groove 12 of the adjacent drive ring block 81. The splicing block 11 and the splicing groove 12 can improve the firmness of the connection between the drive ring blocks 81. The splicing block 11 is slidably set on the drive ring block 81. The splicing block 11 can be extended out of the drive ring block 81 or stored in the drive ring block 81. A splicing spring 13 is provided between the splicing block 11 and the drive ring block 81. The splicing spring 13 drives the splicing block 11 to extend out of the drive ring block 81. The sliding of the splicing block 11 can facilitate the insertion of the splicing block 11 into the splicing groove 12. After the splicing block 11 is inserted into the splicing groove 12, it is reinforced by splicing bolts 14 to reduce the probability of the splicing block 11 sliding off.

[0043] Reference Figure 1 and Figure 2One end of the valve stem 6 inserted into the valve body 1 is equipped with an arc-shaped cone block 15. The arc-shaped cone blocks 15 on the four valve stems 6 drive the four diaphragms 7 to abut against each other, so that the diaphragms 7 seal the cavity 3. The arc-shaped cone blocks 15 can increase the deformation area of ​​the diaphragms 7 driven by the valve stem 6, improve the sealing effect, and reduce the pressure of the valve stem 6 on the diaphragms 7, thus reducing the probability of the valve stem 6 puncturing the diaphragms 7. The arc-shaped cone blocks 15 are provided with a number of grooves 16 and a number of inserts 17. The grooves 16 and the inserts 17 are adapted to each other. The inserts 17 of the arc-shaped cone blocks 15 are inserted into the grooves 16 of the adjacent arc-shaped cone blocks 15. The groove 16 and the insert 17 inside 6 enable the diaphragm 7 to have an uneven surface when it is attached, thereby improving the sealing performance and reducing the probability of leakage due to the diaphragm 7 being too smooth. The valve stem 6 is provided with a guide groove 18, and the valve cover 5 is fixed with a guide block 19 corresponding to the guide groove 18. The guide block 19 is slidably disposed in the guide groove 18. The guide groove 18 and the guide block 19 can guide the sliding of the valve stem 6 and also restrict the rotation of the valve stem 6, thereby reducing the probability that the insert 17 on the arc-shaped cone block 15 cannot be matched with the adjacent groove 16 after the valve stem 6 rotates.

[0044] Reference Figure 1 , Figure 3 and Figure 5 A flange 20 is fixed to the valve body 1 at the mounting hole 4. A circumferentially rotating jaw 21 is provided on the flange 20. The jaw 21 rotates and clamps the valve cover 5 on the side away from the valve body 1. The jaw 21 reduces the probability of the valve cover 5 detaching from the valve body 1. In this embodiment, two jaws 21 are provided on the flange 20, facing opposite ends of the through hole 2 in the valve body 1. A drive rod 22 is provided on the valve body 1 corresponding to the jaws 21. The drive rod 22 drives the jaws 21 to rotate by sliding. A torsion spring is provided between the jaws 21 and the valve cover 5. The torsional force of the torsion spring drives the jaws 21 to rotate away from the valve cover 5. Mounting plates 23 are fixed to both ends of the through hole 2 in the valve body 1. Bolt holes 24 are provided on the mounting plates 23, the number of which is the same as the number of mounting holes 4. The end of the drive rod 22 away from the jaws 21 extends to the bolt hole 24. A bolt drive chuck 21 is installed in the bolt hole 24 to rotate and clamp onto the valve cover 5, thereby reinforcing the valve cover 5 while the valve body 1 is connected to the pipeline, preventing the valve cover 5 from being opened directly. At the same time, the drive rod 22 abuts against the bolt, which also prevents the nut on the bolt from coming off. The valve body 1 is provided with an abutment slide 25, which includes a fixed part 251 fixed to the valve body 1 and a sliding part 252 slidably inserted into the fixed part 251. A compression spring is provided between the fixed part 251 and the sliding part 252. The compression spring drives the sliding part 252 to slide away from the fixed part 251. The drive rod 22 is slidably disposed on the sliding part 252. By pressing the sliding part 252, the drive rod 22 is driven to slide synchronously, thereby disengaging the drive rod 22 from the bolt and the chuck 21. At this time, the nut on the bolt can be removed, and the valve cover 5 that needs to be opened can be disassembled and assembled.

[0045] Reference Figure 1 and Figure 2 The valve body 1 has an annular groove 26 at the mounting hole 4. The diaphragm 7 is placed circumferentially in the annular groove 26. The valve cover 5 is fixed with an annular pressing block 27 corresponding to the annular groove 26. When the cover plate is installed on the valve body 1, the annular pressing block 27 is inserted into the annular groove 26 and pressed against the diaphragm 7 circumferentially, thereby reducing the probability of the diaphragm 7 detaching.

[0046] The implementation principle of this application embodiment is as follows: A diaphragm 7 is placed in the mounting hole 4, and then the valve cover 5 is installed on the valve body 1 to close the mounting hole 4. The arc-shaped cone block 15 on the valve stem 6 abuts against the diaphragm 7. After all valve covers 5 are installed, the drive ring blocks 81 on all valve covers 5 are connected end to end and spliced ​​together. Then, according to actual needs, an external gear ring or drive handle is installed on the drive ring block 81 to complete the assembly of the diaphragm valve. After the diaphragm valve is assembled, the diaphragm valve is connected to the pipeline. When connecting, the bolts used for connection are inserted into the bolt holes 24 and the nuts are installed on the bolts by pressing the sliding part 252. Then, the sliding part 252 rebounds the bolt and drives the drive rod 22 to slide. The sliding of the drive rod 22 abuts against the drive claw 21 to rotate and clamp the valve cover 5 to strengthen the valve cover 5. When it is necessary to replace or open the valve cover 5, the corresponding sliding part 252 is pressed to make the drive rod 22 slide away from the claw 21, and the valve cover 5 is disassembled, replaced or opened for maintenance. Example

[0047] The difference between this embodiment and embodiment 1 is that the driving component 8 in this embodiment is different from that in embodiment 1.

[0048] Reference Figure 6The drive assembly 8 includes a drive ring block 81 and a drive block 83. The drive ring block 81 is slidably disposed on the valve cover 5 and slides towards or away from the valve stem 6. In this embodiment, the drive ring block 81 is a quarter arc. The drive block 83 is fixed on the drive ring block 81. A wedge-shaped surface 28 is formed at the end of the drive block 83 away from the drive ring block 81. The wedge-shaped surface 28 abuts against the end of the valve stem 6 away from the valve body 1. The sliding of the drive ring block 81 drives the drive block 83, and the wedge-shaped surface 28 of the drive block 83 drives the push rod to slide. In this embodiment, a return spring is provided between the push rod and the valve cover 5. The return spring slides away from the push rod when the drive block 83 moves away from the push rod. When the time is driven, the push rod is reset. A sliding track 9 is fixed on the valve cover 5. A track block 10 with a T-shaped cross section is fixed on the inner wall of the drive ring. The track block 10 is slidably set on the sliding track 9. In this embodiment, the track block 10 slides towards or away from the push rod. All the drive ring blocks 81 on the valve cover 5 are connected end to end. After the drive ring blocks 81 are connected end to end to form a complete arc, the drive ring blocks 81 can be electrically driven by installing an electric push cylinder. By sliding the arc, all the valve rods 6 slide synchronously, and all the diaphragms 7 are driven synchronously, improving the synchronicity of the diaphragm 7 drive. The drive ring blocks 81 can be separated to facilitate the disassembly and maintenance of individual valve covers 5.

[0049] The implementation principle of this application embodiment is as follows: A diaphragm 7 is placed in the mounting hole 4, then the valve cover 5 is installed on the valve body 1 to close the mounting hole 4, and the arc-shaped cone block 15 on the valve stem 6 abuts against the diaphragm 7. After all valve covers 5 are installed, the drive ring blocks 81 on all valve covers 5 are connected end to end and spliced ​​together. Then, an electric push cylinder is installed on the valve cover 5 or valve body 1, so that the push rod of the electric push cylinder abuts against the side of the drive ring block 81 away from the push rod, completing the assembly of the diaphragm valve; after the diaphragm valve is assembled, the diaphragm 7 is placed in the mounting hole 4, and the valve cover 5 is installed on the valve body 1 to close the mounting hole 4. The arc-shaped cone block 15 on the valve stem 6 abuts against the diaphragm 7. The diaphragm valve is connected to the pipeline. During connection, the bolt is inserted into the bolt hole 24 and the nut is installed on the bolt by pressing the sliding part 252. Then, the sliding part 252 rebounds the bolt, which drives the drive rod 22 to slide. The sliding of the drive rod 22 drives the pawl 21 to rotate and clamp onto the valve cover 5 to reinforce the valve cover 5. When it is necessary to replace or open the valve cover 5, the corresponding sliding part 252 is pressed to make the drive rod 22 slide away from the pawl 21, so that the valve cover 5 can be disassembled, replaced or opened for maintenance.

[0050] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A long-life diaphragm valve with an overload torque limiting mechanism, comprising a valve body (1), wherein through holes (2) are provided at both ends of the valve body (1), a cavity (3) is provided inside the valve body (1), the cavity (3) is connected to the through holes (2) at both ends of the valve body (1), a mounting hole (4) is provided on the valve body (1), the mounting hole (4) is connected to the cavity (3), a valve cover (5) is installed on the valve body (1) at the mounting hole (4), the valve cover (5) closes the mounting hole (4), a valve stem (6) is slidably provided on the valve cover (5), a diaphragm (7) is provided inside the mounting hole (4), and the valve stem (6) slides to drive the diaphragm (7) to separate the through holes (2) at both ends of the cavity (3), characterized in that: The valve body (1) has several mounting holes (4) circumferentially provided. The valve cover (5), valve stem (6) and diaphragm (7) are provided with multiple mounting holes (4) corresponding to each other. A drive assembly (8) is installed on the valve body (1). The drive assembly (8) drives all valve stems (6) to slide synchronously. When the valve stems (6) slide toward the cavity (3), they drive all diaphragms (7) to abut against each other and close the cavity (3). The drive assembly (8) includes a drive ring block (81) and a drive. Block (83), the drive ring block (81) is slidably disposed on the valve cover (5), the drive ring block (81) slides toward the valve stem (6) or away from the valve stem (6), the drive block (83) is fixed on the drive ring block (81), the drive block (83) has a wedge-shaped surface (28) at the end away from the drive ring block (81), the wedge-shaped surface (28) abuts against the end of the valve stem (6) away from the valve body (1), and the drive ring blocks (81) on all valve covers (5) are connected end to end.

2. A long-life diaphragm valve with an overload torque limiting mechanism according to claim 1, characterized in that: One end of the drive ring block (81) along its length is provided with a splicing block (11), and the other end of the drive ring block (81) along its length is provided with a splicing groove (12). The splicing block (11) at one end of the drive ring block (81) is inserted into the splicing groove (12) of the adjacent drive ring block (81).

3. A long-life diaphragm valve with an overload torque limiting mechanism according to claim 2, characterized in that: The valve stem (6) is inserted into the valve body (1) and an arc-shaped cone block (15) is installed at one end.

4. A long-life diaphragm valve with an overload torque limiting mechanism according to claim 3, characterized in that: The arc-shaped cone (15) is provided with a number of slots (16) and a number of inserts (17). The slots (16) and inserts (17) are adapted to each other. The inserts (17) of the arc-shaped cone (15) are inserted into the slots (16) of the adjacent arc-shaped cone (15).

5. A long-life diaphragm valve with an overload torque limiting mechanism according to claim 4, characterized in that: The valve stem (6) is provided with a guide groove (18), and the valve cover (5) is fixed with a guide block (19) corresponding to the guide groove (18). The guide block (19) is slidably disposed in the guide groove (18).

6. A long-life diaphragm valve with an overload torque limiting mechanism according to claim 5, characterized in that: The valve body (1) is fixed with a flange (20) at the mounting hole (4). The flange (20) is circumferentially rotatably provided with a claw (21). The claw (21) is rotatably clamped on the valve cover (5) on the side away from the valve body (1).

7. A long-life diaphragm valve with an overload torque limiting mechanism according to claim 6, characterized in that: A drive rod (22) is provided on the valve body (1) corresponding to the claw (21), and the drive rod (22) drives the claw (21) to rotate by sliding.

8. A long-life diaphragm valve with an overload torque limiting mechanism according to claim 7, characterized in that: The valve body (1) has a through hole (2) and mounting plates (23) are fixed at both ends. The mounting plates (23) have bolt holes (24). The number of bolt holes (24) is the same as the number of mounting holes (4). The drive rod (22) extends from the end away from the pawl (21) to the bolt hole (24).

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