Mounting structure for valve seat of main steam valve

Abstract

The invention discloses a main steam valve seat mounting structure which comprises a supporting seat fixedly arranged in a valve body, and a sliding locking mechanism arranged in a cavity formed in the supporting seat; the valve seat is movably arranged on the supporting seat, and the baffle ring is used for being in contact with the sliding locking mechanism; the pressing part is arranged on the valve body and is used for triggering the sliding locking mechanism to press and limit the baffle ring, so that the valve seat is pressed and mounted at the top of the supporting seat; the sliding locking mechanism comprises a guiding part and a moving part, the guiding part is used for transmitting pressure of the pressing part, the moving part is used for converting the pressure of the guiding part and acting on the baffle ring, and the moving part and the baffle ring are both provided with inclined faces corresponding to each other so that the baffle ring can drive the valve seat to be pressed downwards and fixed in the valve body when being pressed. According to the invention, the valve seat can be simultaneously fixed and sealed up and down on the valve body, the valve seat can be quickly mounted, and the sealing effect between the valve core and the valve seat when the valve core is loosened is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of valve seat installation, and particularly relates to a main steam valve seat installation structure. Background Art

[0002] A valve seat is a device for supporting the fully closed position of a valve core, a detachable surface component inside a valve, used to support the fully closed position of the valve core. Generally, the valve seat diameter is the maximum flow diameter of the valve. Any metal material can be used as the valve seat material. An elastic sealing material and a small actuator thrust are used to obtain a bubble-tight seal. The compression of the valve seat sealing stress causes the material to elastically deform and squeeze into the rough surface of the mating metal part to block all leakage paths.

[0003] The prior art discloses a main steam valve seat installation structure and installation method with the application number 202210940354.9, including coaxially arranged inner support plates and outer pressure plates. The inner support plates are used to tightly press against the inner wall of the valve seat, the outer pressure plates are used to tightly press against the end face of the valve seat, the outer pressure plates and the inner support plates are connected by a traction component, and one end of the traction component is connected to one end of a main adjustment rod, and a counterweight block is arranged at the other end of the main adjustment rod. The present invention can make the installation tooling not restricted by the valve seat threaded holes and their sizes, and expand the application range of the installation tooling. However, there are still the following deficiencies. When the valve seat is installed on the valve body, the valve seat is clamped tightly at both the upper and lower parts simultaneously, resulting in a gap between the valve seat and the valve body, and the fixed sealing effect is not good. Moreover, it is impossible to ensure the sealing effect between the valve core and the valve seat when the valve core is loose.

[0004] Therefore, a main steam valve seat installation structure is proposed to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to address the above deficiencies currently, and provide a main steam valve seat installation structure to achieve simultaneous upper and lower fixed sealing of the valve seat on the valve body, which is beneficial to the rapid installation of the valve seat and ensures the sealing effect between the valve core and the valve seat when the valve core is loose.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions: A main steam valve seat installation structure, including:

[0007] A support seat, fixedly arranged inside the valve body. A cavity is provided inside the support seat, and a sliding locking mechanism is arranged inside the cavity;

[0008] A valve seat, movably arranged on the support seat. A retaining ring is arranged along the circumference of the valve seat, and the retaining ring is used to contact the sliding locking mechanism;

[0009] A pressing part, arranged on the valve body, used to trigger the sliding locking mechanism to press and limit the retaining ring, so that the valve seat is tightly pressed and installed on the top of the support seat;

[0010] The sliding locking mechanism includes a guiding part and a moving part. The guiding part is used to conduct the pressure of the pressing part, and the moving part is used to convert the pressure of the guiding part and act on the retaining ring. Corresponding inclined surfaces are provided on both the moving part and the retaining ring, so that when the retaining ring is pressed, the valve seat is driven to press down and be fixed in the valve body.

[0011] Further, the pressing part includes a valve cover provided at the top of the valve body. An installation cylinder threadedly installed with the valve body is fixedly provided at the bottom of the valve cover, and a sealing plate sealed with the valve body is provided at the bottom of the installation cylinder.

[0012] The pressing part further includes a pressing part acting on the valve seat, and the pressing part is used to press the valve seat against the support seat.

[0013] The pressing part further includes a pushing part, and the pushing part is used to press the guiding part and provide a downward pressure to the guiding part.

[0014] Further, a valve core part is movably provided inside the valve body and at the top of the valve seat. The valve core part is used to press and seal the valve seat to block the flow of the medium inside the valve body.

[0015] Further, the valve core part includes a screw rod threadedly provided inside the valve cover. Part of the outer wall of the screw rod is threaded, and the screw rod is rotatably connected with the sealing plate. A valve core body is provided at the bottom of the screw rod, and a sealing gasket is provided on the valve core body.

[0016] Further, a valve core sealing part is provided below the valve core part and above the valve seat to seal the valve seat and the valve core part.

[0017] Further, the valve core sealing part includes a first spring provided in the valve seat. An annular sealing body is provided at the top of the first spring and below the sealing gasket. The first spring abuts the annular sealing body against the valve core part to achieve sealing.

[0018] Further, the guiding part includes a pressing rod provided inside the cavity. A pressing block corresponding to the moving part is fixedly provided at the bottom of the pressing rod.

[0019] The pressing rod corresponds to the pushing part.

[0020] Further, the moving part includes a transmission rod movably provided in the cavity. The transmission rod is L-shaped, and the horizontal end of the transmission rod extends outside the cavity and corresponds to the retaining ring.

[0021] A first abutting block is provided at one end of the transmission rod inside the cavity. Opposite inclined surfaces are provided on both the first abutting block and the pressing block.

[0022] One end of the transmission rod located outside the cavity is provided with a second abutting block, and corresponding inclined surfaces are provided on the second abutting block and the retaining ring;

[0023] A movable sealing plate fixedly connected to the transmission rod and moving therewith is provided on the support seat;

[0024] A return spring for abutting against the first abutting block is further provided in the cavity, and the return spring pushes the second abutting block away from the retaining ring.

[0025] Furthermore, an extension ring is provided at the top end of the valve seat, and the extension ring is located above the support seat. A sealing body for contacting the support seat is fixedly provided below the extension ring. The sealing body is in a circular ring shape. A sealing cylinder for contacting the support seat is fixedly provided on the valve seat along the circumferential direction and above the retaining ring.

[0026] Furthermore, a positioning rod is fixedly provided at the top of the support seat. A limiting hole for installing the positioning rod is provided on the valve seat, and the positioning rod is used for horizontally limiting the valve seat.

[0027] The beneficial effects of the present invention are as follows:

[0028] In the present invention, the valve seat is installed on the support seat inside the valve body. The sealing body on the valve seat is installed on the top of the support seat, and the sealing cylinder on the valve seat is installed inside the support seat. Then, the limiting hole on the valve seat is inserted into the positioning rod on the top of the support seat. At the same time, the valve cover drives the installation cylinder, the sealing plate, the pressing part, the pushing part, the screw rod, the valve core body and the sealing gasket to be inserted into the valve body. The valve cover drives the installation cylinder to be threadedly installed on the valve body. Then, the sealing plate on the installation cylinder seals the valve body. The sealing plate pushes the pressing part to tightly install the valve seat on the support seat. At the same time, the pushing part applies pressure to the pressing rod and the pressing block. The pressing block pushes the first abutting block to apply pressure to the return spring. And, the first abutting block pushes the transmission rod and the second abutting block to abut and tightly press the retaining ring on the valve seat. At the same time, the pressing part tightly presses the extension ring, the sealing body and the support seat on the valve seat, respectively limiting the valve seat at the upper and lower ends of the support seat. Then, the valve cover and the valve body are installed through bolts, quickly installing the valve seat and the valve core part on the valve body. Then, the screw rod on the valve core part drives the valve core body and the sealing gasket to be tightly sealed on the valve seat. At the same time, the first spring on the valve seat pushes the annular sealing body to be tightly pressed against the sealing gasket, preventing the valve seat from continuously pressing the valve core body when the valve core body is loose, so as to achieve simultaneous upper and lower fixing and sealing of the valve seat on the valve body, which is beneficial to the quick installation of the valve seat and ensures the sealing effect between the valve core and the valve seat when the valve core is loose. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a perspective view of the present invention;

[0030] Figure 2Partial cross-sectional view of the present invention;

[0031] Figure 3 Front cross-sectional view of the present invention;

[0032] Figure 4 Of the present invention Figure 3 Partial enlarged view of A shown in the present invention;

[0033] Figure 5 Of the present invention Figure 3 Partial enlarged view of B shown in the present invention;

[0034] Figure 6 Three-dimensional view of the pressing part and the valve seat of the present invention;

[0035] Figure 7 Three-dimensional view of the valve seat, guiding part and movement of the present invention.

[0036] In the figure:

[0037] 1. Valve body;

[0038] 2. Pressing part; 21. Valve cover; 22. Mounting cylinder; 23. Sealing plate; 24. Pressing part; 241. Pushing part;

[0039] 3. Spool part; 31. Screw; 32. Spool body; 33. Sealing gasket;

[0040] 4. Support seat;

[0041] 5. Valve seat;

[0042] 6. Spool sealing part; 61. First spring; 62. Annular sealing body;

[0043] 7. Guiding part; 71. Pressing rod; 72. Pressing block;

[0044] 8. Moving part; 81. First abutting block; 82. Return spring; 83. Transmission rod; 84. Second abutting block;

[0045] 10. Sealing body;

[0046] 11. Retaining ring;

[0047] 12. Positioning rod;

[0048] 13. Sealing cylinder. Detailed implementation manners

[0049] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0050] Please refer to Figure 1-7 , the present invention discloses a main steam valve seat installation structure, including:

[0051] A support seat 4, fixedly arranged inside the valve body 1. A cavity is provided inside the support seat 4, and a sliding locking mechanism is arranged in the cavity. The cavity inside the support seat 4 is used to support the sliding locking mechanism;

[0052] A valve seat 5, movably arranged on the support seat 4. A retaining ring 11 is arranged along the circumference of the valve seat 5. The retaining ring 11 is used to contact the sliding locking mechanism. The valve seat 5 is locked and installed on the outer wall of the support seat 4 up and down simultaneously through the sliding locking mechanism to prevent the valve seat from falling off and avoid insecure installation;

[0053] A pressing part 2, arranged on the valve body 1, used to trigger the sliding locking mechanism to press and limit the retaining ring 11, so that the valve seat 5 is tightly pressed and installed on the top of the support seat 4. The pressing part 2 is used to seal the valve body 1 and is threadedly installed on the valve body 1. The pressing part 2 is also used to rotatably support the valve core part 3;

[0054] The sliding locking mechanism includes a guiding part 7 and a moving part 8. The guiding part 7 is used to transmit the pressure of the pressing part 2, and the moving part 8 is used to convert the pressure of the guiding part 7 and act on the retaining ring 11. Corresponding inclined surfaces are provided on both the moving part 8 and the retaining ring 11, so that when the retaining ring 11 is pressed, the valve seat 5 is driven to press down and be fixed inside the valve body 1. The guiding part 7 is movably arranged in the upper half of the inside of the support seat 4, and the guiding part 7 extends out of the top of the support seat 4. The moving part 8 is movably arranged in the lower half of the inside of the support seat 4, and the moving part 8 extends out below the support part.

[0055] During use, the valve seat 5 is installed on the support seat 4 inside the valve body 1, the pressing part 2 is threadedly installed on the valve body 1 and seals it. The pressing part 2 presses the valve seat 5 on the top of the support seat 4. At the same time, the pressing part 2 applies pressure to the guiding part 7 and the moving part 8. The moving part 8 is pushed to move through the guiding part 7, and the moving part 8 presses the retaining ring 11 at the bottom of the valve seat 5, so that the valve seat 5 is limited up and down on the support seat 4, which is convenient for simultaneously limiting the valve seat 5 up and down and is beneficial to quickly installing the valve seat.

[0056] Such as Figures 2-6As shown, in a specific embodiment, the pressing part 2 includes a valve cover 21 provided on the top of the valve body 1. The valve cover 21 is threadedly installed with the valve body 1 through bolts to further install and fix the valve cover 21 and the valve body 1. A mounting cylinder 22 that is threadedly installed with the valve body 1 is fixedly provided at the bottom of the valve cover 21. The mounting cylinder 22 is used to install and limit the valve body 1. A sealing plate 23 that is sealed with the valve body 1 is provided at the bottom of the mounting cylinder 22. The sealing plate 23 is used to seal the upper part inside the valve body 1;

[0057] The pressing part 2 further includes a pressing portion 24 acting on the valve seat 5. The pressing portion 24 is used to press the valve seat 5 against the support seat 4. The sealing plate 23 rotates above the pressing portion 24, and the sealing plate 23 applies a downward pressure to the pressing portion 24;

[0058] The pressing portion 24 further includes a pushing portion 241. The pushing portion 241 is used to press the guiding portion 7 and provide a downward pressure to the guiding portion 7. The pushing portion 241 is located outside the pressing portion 24, and the pushing portion 241 is used to press the guiding portion 7;

[0059] During use, the valve cover 21 drives the mounting cylinder 22 to be threadedly installed inside the valve body 1. At the same time, the mounting cylinder 22 drives the sealing plate 23 to rotate on the pressing portion 24 and apply a downward pressure. The upper part of the valve body 1 is sealed by the sealing plate 23, and the valve seat 5 and the support seat 4 are pressed by the pressing portion 24. The guiding portion 7 is pushed by the pushing portion 241 to slide inside the support seat 4.

[0060] As Figures 2-4 shown, in an embodiment, a valve core part 3 is movably provided inside the valve body 1 and on top of the valve seat 5. The valve core part 3 is used to press and seal the valve seat 5 to block the flow of the medium inside the valve body 1. The valve seat 5 is used to support the valve core part 3.

[0061] As Figures 2-4 shown, in a specific embodiment, the valve core part 3 includes a screw rod 31 threadedly provided inside the valve cover 21. Part of the outer wall of the screw rod 31 is threaded, and the screw rod 31 is rotatably connected to the sealing plate 23. A valve core body 32 is provided at the bottom of the screw rod 31. A sealing gasket 33 is provided on the valve core body 32. The screw rod 31 rotates on the valve cover 21, driving the valve core body 32 and the sealing gasket 33 to move up and down. The valve core body 32 and the sealing gasket 33 press the valve core sealing part 6 on the valve seat 5 to control the flow of the medium in the valve body 1.

[0062] As Figures 2-4 shown, in an embodiment, a valve core sealing part 6 is provided below the valve core part 3 and above the valve seat 5 for sealing the valve seat 5 and the valve core part 3.

[0063] During use, the valve core part 3 presses against the valve core sealing part 6 of the valve seat 5 to control the flow of the medium at the valve seat 5 and the valve core part 3. When the valve core part 3 becomes loose through the valve core sealing part 6, the valve core sealing part 6 on the valve seat 5 continuously presses against the valve core part 3 to improve the sealing effect.

[0064] As Figures 2-4 shown, in a specific embodiment, the valve core sealing part 6 includes a first spring 61 disposed within the valve seat 5. At the top of the first spring 61 and below the sealing gasket 33, there is an annular sealing body 62. The first spring 61 abuts against the annular sealing body 62 to contact the valve core part 3, achieving sealing. The valve seat 5 is provided with a groove for installing the first spring 61 and the sealing gasket 33. The groove is circular. The first spring 61 is used to drive the sealing gasket 33 to apply an upward force. The sealing gasket 33 is circular, and the longitudinal section of the sealing gasket 33 is T-shaped. The sealing gasket 33 is in sliding seal with the groove.

[0065] As Figures 2-7 shown, in an embodiment, the guiding part 7 includes a pressing rod 71 disposed inside the cavity. At the bottom of the pressing rod 71, there is a pressing block 72 fixedly provided for pressing the moving part 8;

[0066] The pressing rod 71 corresponds to the pushing part 241.

[0067] During use, the pushing part 241 first contacts the pressing rod 71, pushing the pressing rod 71 to move downward, and the pressing rod 71 pushes the pressing block 72 to apply a downward pressure.

[0068] As Figures 2-7 shown, in a specific embodiment, the moving part 8 includes a transmission rod 83 movably disposed inside the cavity. The transmission rod 83 is L-shaped, and the horizontal end of the transmission rod 83 extends outside the cavity to correspond to the retaining ring 11;

[0069] One end of the transmission rod 83 inside the cavity is provided with a first abutting block 81. Opposite inclined surfaces are provided on both the first abutting block 81 and the pressing block 72;

[0070] One end of the transmission rod 83 outside the cavity is provided with a second abutting block 84. Opposite inclined surfaces are provided on both the second abutting block 84 and the retaining ring 11;

[0071] The support seat 4 is provided with a movable sealing plate 41 fixedly connected to the transmission rod 83 and moving therewith. The movable sealing plate 41 is used for sliding seal of the bottom of the support seat 4;

[0072] A return spring 82 for abutting against the first abutting block 81 is further disposed inside the cavity. The return spring 82 pushes the second abutting block 84 to separate from the retaining ring 11.

[0073] In use, the pressing block 72 pushes the first abutting block 81 and the transmission rod 83 to pressurize the return spring 82. At the same time, the transmission rod 83 drives the movable sealing plate 41 to slide on the support seat 4. The transmission rod 83 drives the second abutting block 84 to exert a downward pressure on the retaining ring 11, and the retaining ring 11 on the valve seat 5 is pressed against the second abutting block 84 to tightly press the lower part of the valve seat 5 to prevent loosening.

[0074] As Figure 4 and Figure 5 shown, in an embodiment, the top end of the valve seat 5 is provided with an extension ring, and the extension ring is located above the support seat 4. A sealing body 10 for contacting the support seat 4 is fixedly provided below the extension ring. The sealing body 10 is in a circular ring shape. The valve seat 5 is fixedly provided with a sealing cylinder 13 for contacting the support seat 4 along the circumferential direction and above the retaining ring 11.

[0075] In use, the pressing portion 24 tightly presses the extension ring on the valve seat 5 above the support seat 4. At the same time, it tightly presses the upper part of the valve seat 5 and the support seat 4 to prevent the upper part from loosening. The sealing body 10 is used to seal the extension ring and the support seat 4, and the sealing cylinder 13 is used to seal the valve seat 5 along the circumferential direction, improving the sealing effect between the valve seat 5 and the support seat 4.

[0076] As Figure 4 shown, in a specific embodiment, a positioning rod 12 is fixedly provided at the top of the support seat 4, and a limit hole for installing the positioning rod 12 is provided on the valve seat 5. The positioning rod 12 is used to horizontally limit the valve seat 5.

[0077] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, then the directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0078] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present invention, then the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0079] In addition, "a plurality" means two or more.

[0080] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A mounting structure for a main steam valve seat, characterized in that Comprising: A support base (4), fixedly arranged inside the valve body (1), a cavity is provided inside the support base (4), and a sliding locking mechanism is arranged inside the cavity; A valve seat (5), movably arranged on the support base (4), a retaining ring (11) is arranged along the circumference of the valve seat (5), and the retaining ring (11) is used to contact the sliding locking mechanism; A pressing part (2), arranged on the valve body (1), used to trigger the sliding locking mechanism to press and limit the retaining ring (11), so that the valve seat (5) is pressed and installed on the top of the support base (4); The sliding locking mechanism includes a guiding part (7) and a moving part (8), the guiding part (7) is used to conduct the pressure of the pressing part (2), the moving part (8) is used to convert the pressure of the guiding part (7) and act on the retaining ring (11), and inclined surfaces corresponding to each other are arranged on both the moving part (8) and the retaining ring (11), so that when the retaining ring (11) is pressed, the valve seat (5) is driven to press down and fixed inside the valve body (1).

2. The installation structure of the main steam valve seat according to claim 1, characterized in that: The pressing part (2) includes a valve cover (21) arranged on the top of the valve body (1), an installation cylinder (22) fixedly arranged at the bottom of the valve cover (21) and threadedly installed with the valve body (1), and a sealing plate (23) arranged at the bottom of the installation cylinder (22) and sealed with the valve body (1); The pressing part (2) further includes a pressing part (24) acting on the valve seat (5), and the pressing part (24) is used to press the valve seat (5) against the support base (4); The pressing part (24) further includes a pushing part (241), and the pushing part (241) is used to press the guiding part (7) and provide a downward pressure to the guiding part (7).

3. The installation structure of the main steam valve seat according to claim 2, characterized in that: A valve core part (3) is movably arranged inside the valve body (1) and on the top of the valve seat (5), and the valve core part (3) is used to press and seal the valve seat (5) to block the flow of the medium inside the valve body (1).

4. The installation structure of a main steam valve seat according to claim 3, characterized in that: The valve core part (3) includes a screw rod (31) threadedly arranged inside the valve cover (21), a part of the outer wall of the screw rod (31) is provided with threads, and the screw rod (31) is rotatably connected with the sealing plate (23), a valve core body (32) is arranged at the bottom of the screw rod (31), and a sealing gasket (33) is arranged on the valve core body (32).

5. The installation structure of a main steam valve seat according to claim 4, characterized in that: A valve core sealing part (6) is arranged below the valve core part (3) and above the valve seat (5) to seal the valve seat (5) and the valve core part (3).

6. The installation structure of a main steam valve seat according to claim 5, characterized in that: The valve core sealing part (6) includes a first spring (61) arranged inside the valve seat (5), an annular sealing body (62) is arranged at the top of the first spring (61) and below the sealing gasket (33), and the first spring (61) abuts against the annular sealing body (62) to contact the valve core part (3) to achieve sealing.

7. The installation structure of a main steam valve seat according to claim 2, characterized in that: The guiding part (7) includes a pressing rod (71) arranged inside the cavity, and a pressing block (72) fixedly arranged at the bottom of the pressing rod (71) and corresponding to the moving part (8); The pressing rod (71) corresponds to the pushing part (241).

8. The installation structure of a main steam valve seat according to claim 7, characterized in that: The moving part (8) includes a transmission rod (83) movably arranged inside the cavity, the transmission rod (83) is in an L shape, and the horizontal end of the transmission rod (83) extends outside the cavity and corresponds to the retaining ring (11); One end of the transmission rod (83) located inside the cavity is provided with a first abutting block (81), and opposite inclined surfaces are provided on both the first abutting block (81) and the pressing block (72); One end of the transmission rod (83) located outside the cavity is provided with a second abutting block (84), and corresponding inclined surfaces are provided on both the second abutting block (84) and the retaining ring (11); A movable sealing plate (41) fixedly connected to the transmission rod (83) and moving therewith is provided on the support base (4); A return spring (82) for abutting against the first abutting block (81) is further provided in the cavity, and the return spring (82) pushes the second abutting block (84) to separate from the retaining ring (11).

9. The installation structure of the main steam valve seat according to claim 1, wherein: The top end of the valve seat (5) is provided with an extension ring, and the extension ring is located above the support base (4). A sealing body (10) for contacting the support base (4) is fixedly provided below the extension ring. The sealing body (10) is circular ring-shaped. A sealing cylinder (13) for contacting the support base (4) is fixedly provided on the valve seat (5) along the circumferential direction and above the retaining ring (11).

10. The installation structure of the main steam valve seat according to claim 1, characterized in that: A positioning rod (12) is fixedly provided on the top of the support base (4), a limiting hole for installing the positioning rod (12) is formed in the valve seat (5), and the positioning rod (12) is used for horizontally limiting the valve seat (5).

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