A valve seat replaceable gate valve

Abstract

The application relates to the field of valves, in particular to a valve seat replaceable gate valve which comprises a valve body and a valve cover, the valve cover is installed on the top side of the valve body, the valve cover is installed with a valve rod, the valve rod is installed with a valve plate, two valve seats are arranged in the valve body, convex rings and first sealing rings are coaxially and fixedly installed on the sides away from each other of the two valve seats, the first sealing rings are sleeved on the convex rings, the valve body is provided with containing grooves for clamping the convex rings and the valve seats, the valve seats are installed with limiting mechanisms, the limiting mechanisms are used for limiting the valve seats from sliding out of the containing grooves, ring grooves are arranged on the sides close to each other of the two valve seats, and second sealing rings are fixedly installed in the ring grooves. The application has the effect of conveniently replacing the valve seats.

Description

Technical Field

[0001] This application relates to the field of valves, and in particular to a gate valve with a replaceable seat. Background Technology

[0002] In the field of industrial fluid control, gate valves, as a common shut-off device, are widely used in various pipeline systems to control the flow of fluids.

[0003] Prior to this technical solution, there were two main methods for fixing gate valve seats. One method involved welding the seat to the valve body, which ensured the connection strength between the seat and the body, thus guaranteeing the sealing and stability of the gate valve to a certain extent. The other method involved directly damping the seat into the valve body, relying on the friction between the seat and the body for fixation. This method was relatively convenient to install and did not require complex welding processes.

[0004] However, existing methods of fixing valve seats have significant drawbacks. For valve seats fixed by welding, when an abnormality occurs, they cannot be replaced because they are welded to the valve body; the entire gate valve must be replaced, resulting in wasted resources and increased costs. Conversely, valve seats directly damped and inserted into the valve body are difficult to remove when replacement is needed due to the damping effect between the seat and the valve body, greatly complicating the replacement process. Summary of the Invention

[0005] To facilitate valve seat replacement, this application provides a gate valve with a replaceable valve seat.

[0006] This application provides a gate valve with a replaceable valve seat, which adopts the following technical solution:

[0007] A gate valve with replaceable valve seat includes a valve body and a valve cover. The valve cover is installed on the top side of the valve body, and a valve stem is installed on the valve cover. A valve plate is installed on the valve stem. Two valve seats are provided inside the valve body. A convex ring and a first sealing ring are coaxially fixedly installed on the side of the two valve seats that are far apart from each other. The first sealing ring is sleeved on the convex ring. The valve body has a receiving groove for the convex ring and the valve seat to engage. A limiting mechanism is installed on the valve seat to prevent the valve seat from sliding out of the receiving groove. An annular groove is provided on the side of the two valve seats that are close to each other. A second sealing ring is fixedly installed inside the annular groove.

[0008] By adopting the above technical solution, the receiving groove accommodates the valve seat, the limiting mechanism can restrict the valve seat from sliding out of the receiving groove, and the first sealing ring and the second sealing ring can play a sealing role. When the valve seat needs to be replaced, the limiting mechanism can be released to remove the valve seat for replacement.

[0009] Optionally, the limiting mechanism includes multiple bolts, which slide through the inner bottom wall of the annular groove and the first sealing ring, and the bolts are threaded into the valve body.

[0010] By adopting the above technical solution, the valve seat is fixed to the valve body with bolts. When the valve seat needs to be replaced, the limit can be released by unscrewing the bolts, and the valve seat can be removed for replacement. The first sealing ring is fitted on the convex ring, and the second sealing ring is set in the ring groove, which can enhance the sealing performance of the gate valve.

[0011] Optionally, multiple shields are installed inside the annular groove, the shields covering the portion of the bolt located inside the annular groove, and the second sealing ring has a clearance groove for the shields to enter.

[0012] By adopting the above technical solution, the shield separates the bolt from the second sealing ring, which can reduce the occurrence of bolt damage caused by the second sealing ring squeezing the bolt.

[0013] Optionally, the limiting mechanism includes a guide cylinder, a guide rod, a pressure rod, and a drive assembly. There are multiple guide cylinders, guide rods, and pressure rods, and they are arranged in a one-to-one correspondence. The guide cylinders are all fixedly installed inside the valve body and located outside the receiving groove. Multiple guide cylinders are arranged around the valve seat. The guide rod slides through the guide cylinder. One end of the pressure rod is fixedly connected to one end of the guide rod. The pressure rod is arranged perpendicular to the guide rod. The pressure rod is used to press the side of the valve seat away from the convex ring. The drive assembly is used to drive the guide rod to rotate.

[0014] By employing the above technical solution, the drive assembly drives the guide rod to rotate, causing the pressure rod to press the valve seat away from the convex ring, preventing the valve seat from sliding out of the receiving groove. When the valve seat needs to be replaced, the limit can be released by driving the guide rod to rotate through the drive assembly, allowing the valve seat to be removed and replaced.

[0015] Optionally, the drive assembly includes a guide block, a first airbag, and a sealing block. The sealing block is fixedly installed at the end of the guide cylinder away from the pressure rod. The first airbag is located inside the guide cylinder and is fixedly installed on the sealing block. The first airbag is used to push the guide rod away from the sealing block. The guide block is fixedly installed on the rod body of the guide rod. The inner wall of the guide cylinder is provided with a guide groove for the guide block to slide. The guide groove is inclined from one end to the other, gradually moving away from the sealing block.

[0016] By adopting the above technical solution, the first airbag pushes the guide rod away from the sealing block, causing the guide rod to slide along the guide cylinder, which in turn drives the guide block to slide within the inclined guide groove. The guide rod rotates as it moves, causing the pressure rod to press against the valve seat and act as a limit. When the valve seat needs to be replaced, simply moving the pressure rod releases the restriction on the valve seat, facilitating its disassembly and replacement.

[0017] Optionally, the valve seat is provided with a first annular tube, which is connected to each of the first airbags around the valve seat. The valve stem is fixedly fitted with a fixed ring, and the valve stem is slidably fitted with a movable ring. The movable ring is located above the fixed ring, and the outer wall of the movable ring is fixedly connected to the valve cover. Multiple support rods and second airbags are also fixedly installed on the top side of the fixed ring. The support rods pass through the movable ring, and the second airbags wrap around the support rods. A vent pipe is connected between the second airbags and the first annular tube. The second airbags are fitted with a pressure cover, which is installed on the top side of the movable ring.

[0018] By adopting the above technical solution, during the process of the valve stem driving the valve plate to descend, the fixing ring descends with the valve stem, driving the support rod and the second airbag to be pulled out from the pressure cover. This allows the air in the first airbag to flow to the second airbag through the first ring pipe and the vent pipe. The air in the first airbag decreases, reducing the supporting force on the guide rod, which facilitates the valve plate descending and squeezing the pressure rod to rotate, driving the guide rod to slide and rotate towards the sealing block. When the valve stem drives the valve plate to rise, the fixing ring rises with the valve stem, driving the support rod and the second airbag into the pressure cover. This allows the air in the second airbag to flow to the first airbag through the first ring pipe and the vent pipe. The air in the first airbag increases, increasing the supporting force on the guide rod, which facilitates the first airbag pushing the guide rod away from the sealing block and rotating when the valve plate rises, driving the pressure rod to limit the valve seat on the side away from the convex ring.

[0019] Optionally, the pressure cover is threaded into the movable ring.

[0020] By adopting the above technical solution, the pressure cover can be rotated to raise and lower, which can easily adjust the amount of air inside the second airbag being forced into the first airbag.

[0021] Optionally, a plurality of first driving blocks are fixedly installed on the inner wall of the pressure cover. The plurality of first driving blocks are arranged at intervals along the circumference of the pressure cover. The bottom side of each of the first driving blocks is inclined. A driving rod is fixedly installed on the top of the support rod. The driving rod is located outside the second airbag. A column rod is fixedly installed on the driving rod.

[0022] By adopting the above technical solution, the first drive block cooperates with the column rod, which facilitates the rotation of the pressure cover by the upward movement of the valve rod.

[0023] Optionally, a plurality of second driving blocks are fixedly installed on the inner wall of the pressure cover. The plurality of second driving blocks are arranged at intervals along the circumference of the pressure cover. The second driving blocks are located below two adjacent first driving blocks, and the bottom sides of the second driving blocks are all inclined.

[0024] By adopting the above technical solution, the second drive block cooperates with the column rod, which facilitates the rotation of the pressure cover by the upward movement of the valve rod.

[0025] Optionally, a spring sheet is fixedly installed on the outer wall of the pressure cover, and multiple metal rods are fixedly installed on the top side of the fixing ring. The multiple metal rods are arranged around the pressure cover, and the metal rods are used for the spring sheet to strike.

[0026] By adopting the above technical solution, when the pressure cover is rotated, the spring strikes the metal rod to make a sound, reminding the operator that the pressure cover has been operated.

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

[0028] The valve seat is restricted from sliding out of the receiving groove by a limiting mechanism. When the valve seat needs to be replaced, the limiting mechanism can be released to remove the valve seat for replacement, which reduces the waste of resources and increased costs of replacing the entire gate valve due to the inability to replace the valve seat.

[0029] The valve seat is tightened and loosened by rotating the pressure rod, which facilitates the replacement of the valve seat. Attached Figure Description

[0030] Figure 1 This is a sectional view of Embodiment 1 of this application, taken radially along the vertical direction of the gate valve;

[0031] Figure 2 yes Figure 1 Enlarged view at point A;

[0032] Figure 3 This is an exploded view of the second sealing ring and valve seat in Embodiment 1 of this application;

[0033] Figure 4 This is a sectional view of Embodiment 2 of this application, taken radially along the vertical direction of the gate valve;

[0034] Figure 5 This is a schematic diagram of the valve seat at one end of the valve body in Embodiment 2 of this application;

[0035] Figure 6 This is an exploded view of the guide cylinder and guide rod in Embodiment 2 of this application;

[0036] Figure 7 yes Figure 4 Enlarged view at point B.

[0037] Explanation of reference numerals in the attached drawings: 1. Valve body; 2. Valve cover; 3. Valve stem; 4. Valve plate; 5. Valve seat; 6. Raised ring; 7. First sealing ring; 8. Receiving groove; 9. Annular groove; 10. Second sealing ring; 11. Limiting mechanism; 111. Bolt; 112. Guide cylinder; 113. Guide rod; 114. Pressure rod; 115. Drive assembly; 1151. Guide block; 1152. Sealing block; 1153. First airbag; 12. Shield; 13. Clearance groove; 14. Guide groove; 15. First annular tube; 16. Fixed ring; 17. Movable ring; 18. Support rod; 19. Second airbag; 20. Vent pipe; 21. Pressure cover; 22. First drive block; 23. Second drive block; 24. Drive rod; 25. Column rod; 26. Spring; 27. Metal rod. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail. Example 1

[0039] This application discloses a gate valve with replaceable valve seat 5.

[0040] Reference Figure 1 A gate valve with replaceable seat 5 includes a valve body 1, a valve cover 2, a valve stem 3, and a valve plate 4. The valve cover 2 is mounted on the top side of the valve body 1, and the valve stem 3 is mounted on the valve cover 2. One end of the valve stem 3, located inside the valve body 1, is connected to the valve plate 4. The valve stem 3 can only move up and down, not rotate. The movement of the valve stem 3 is controlled by rotating a handwheel on the valve cover 2, which in turn moves the valve plate 4 up and down.

[0041] Reference Figure 2 , Figure 3 The valve body 1 has two valve seats 5 inside. On the side of the two valve seats 5 that are far apart from each other, a convex ring 6 and a first sealing ring 7 are coaxially fixedly installed. The first sealing ring 7 is sleeved on the convex ring 6. The valve body 1 has a receiving groove 8 for the convex ring 6 and the valve seat 5 to engage. The shape of the receiving groove 8 is adapted to the convex ring 6 and the valve seat 5, which can ensure that the valve seat 5 is accurately installed inside the valve body 1.

[0042] An annular groove 9 is formed on one side of the two valve seats 5 that are close to each other, and a second sealing ring 10 is fixedly installed inside the annular groove 9. The annular groove 9 provides installation space for the second sealing ring 10, and the second sealing ring 10 also plays a sealing role to prevent media leakage.

[0043] Reference Figure 2 , Figure 3The valve seat 5 is equipped with a limiting mechanism 11, which includes multiple bolts 111. The bolts 111 slide through the inner bottom wall of the annular groove 9 and the first sealing ring 7, and are threaded into the valve body 1. During installation, the bolts 111 are passed through the inner bottom wall of the annular groove 9 and the first sealing ring 7 and then screwed into the valve body 1, thereby fixing the valve seat 5 to the valve body 1. When the valve seat 5 needs to be replaced, simply unscrew the bolts 111.

[0044] Multiple shields 12 are installed inside the annular groove 9. The shields 12 cover the portion of the bolt 111 located inside the annular groove 9. The second sealing ring 10 has a clearance groove 13 for the shields 12 to enter. The shields 12 are used to separate the second sealing ring 10 from the bolt 111, thereby reducing the possibility of damage caused by mutual compression between the second sealing ring 10 and the bolt 111. The clearance groove 13 ensures that the shields 12 can be smoothly installed inside the annular groove 9, guaranteeing the integrity and sealing of the entire structure.

[0045] The implementation principle of a gate valve with a replaceable valve seat 5 according to an embodiment of this application is as follows: by setting a raised ring 6, a first sealing ring 7, and a second sealing ring 10 on the valve seat 5, the sealing performance of the gate valve is effectively guaranteed. At the same time, the use of a limiting mechanism 11, particularly the bolt 111, makes the installation and disassembly of the valve seat 5 very convenient. When the valve seat 5 malfunctions, simply unscrewing the bolt 111 allows the valve seat 5 to be removed from the valve body 1 for replacement, avoiding the resource waste and increased costs caused by the difficulty in replacing the valve seat 5 in the prior art, and improving the maintenance convenience and service life of the gate valve. Example 2

[0046] This application discloses a gate valve with replaceable valve seat 5.

[0047] Reference Figure 4 , Figure 5 The difference between the valve seat 5 replaceable gate valve of this application embodiment and that of Embodiment 1 lies in the limiting mechanism 11. The limiting mechanism 11 of this application embodiment includes a guide cylinder 112, a guide rod 113, a pressure rod 114, and a drive assembly 115. Multiple guide cylinders 112, guide rods 113, and pressure rods 114 are provided, each corresponding to the other. The guide cylinders 112 are all fixedly installed inside the valve body 1 and located outside the receiving groove 8, with multiple guide cylinders 112 surrounding the valve seat 5. The guide rod 113 slides through the guide cylinder 112, and one end of the pressure rod 114 is fixedly connected to one end of the guide rod 113, with the pressure rod 114 perpendicular to the guide rod 113.

[0048] The drive assembly 115 drives the guide rod 113 to rotate. When the pressure rod 114 rotates to the side of the valve seat 5 away from the convex ring 6, the pressure rod 114 limits the valve seat 5, thereby reducing the possibility of the valve seat 5 sliding out of the receiving groove 8. When the pressure rod 114 rotates away from the side of the valve seat 5 away from the convex ring 6, it is convenient to remove the valve seat 5 from the receiving groove 8 for replacement.

[0049] Reference Figure 5 , Figure 6 The drive assembly 115 includes a guide block 1151, a sealing block 1152, and a first airbag 1153. The sealing block 1152 is fixedly installed at the end of the guide cylinder 112 away from the pressure rod 114. The first airbag 1153 is located inside the guide cylinder 112 and is fixedly installed on the sealing block 1152. The first airbag 1153 is used to push the guide rod 113 away from the sealing block 1152.

[0050] The guide block 1151 is fixedly installed on the body of the guide rod 113. The inner wall of the guide cylinder 112 is provided with a guide groove 14 for the guide block 1151 to slide. The guide groove 14 is inclined and gradually moves away from the sealing block 1152 from one end to the other. When the first airbag 1153 is inflated, it pushes the guide rod 113 to move. The guide block 1151 slides in the guide groove 14. Since the guide groove 14 is inclined, the guide rod 113 will rotate while moving, thereby causing the pressure rod 114 to squeeze the valve seat 5 and limit the valve seat 5.

[0051] Reference Figure 4 , Figure 7 The valve seat 5 is provided with a first annular tube 15, which is connected to each of the first air bladders 1153 around the valve seat 5. The first annular tube 15 can evenly deliver gas to each of the first air bladders 1153. The valve stem 3 is fixedly fitted with a fixed ring 16, and the valve stem 3 is slidably fitted with a movable ring 17. The movable ring 17 is located above the fixed ring 16, and the outer wall of the movable ring 17 is fixedly connected to the valve cover 2.

[0052] Multiple support rods 18 and a second airbag 19 are also fixedly installed on the top side of the fixed ring 16. The support rods 18 pass through the movable ring 17, and the second airbag 19 wraps around the support rods 18. A vent pipe 20 is connected between the second airbag 19 and the first ring tube 15. The second airbag 19 is fitted with a pressure cover 21, which is threaded into the top side of the movable ring 17.

[0053] During the upward movement of the valve plate 4 driven by the valve stem 3, the valve plate 4 moves out from the two valve seats 5, and the support rod 18 drives the second airbag 19 into the pressure cover 21. The pressure cover 21 compresses the second airbag 19, causing the air inside the second airbag 19 to flow from the vent pipe 20 and the first annular pipe 15 to the first airbag 1153, thereby increasing the supporting force of the first airbag 1153 on the guide rod 113, and thus accelerating the speed at which the first airbag 1153 pushes the guide rod 113 away from the sealing block 1152. By accelerating the speed at which the first airbag 1153 pushes the guide rod 113 away from the sealing block 1152, it facilitates the movement of the pressure rod 114 to limit the valve seat 5 after the valve plate 4 moves out from between the two valve seats 5, thereby reducing the possibility of the valve seat 5 sliding out of the receiving groove 8.

[0054] As the valve stem 3 lowers the valve plate 4, the valve plate 4 enters between the two valve seats 5. The valve plate 4 squeezes the pressure rod 114 to rotate, and through the guide block 1151 and the guide groove 14, the guide rod 113 slides towards the sealing block 1152. At the same time, the support rod 18 drives the second airbag 19 to move out of the pressure cover 21. The air inside the first airbag 1153 flows from the vent pipe 20 and the first ring pipe 15 to the second airbag 19, thereby reducing the supporting force of the first airbag 1153 on the guide rod 113, thus facilitating the rotation of the pressure rod 114 by the valve plate 4.

[0055] The pressure cover 21 is rotated to raise and lower the pressure, thereby facilitating the adjustment of the amount of air inside the second airbag 19 being forced into the first airbag 1153 by the pressure cover 21 after the second airbag 19 enters the pressure cover 21.

[0056] Reference Figure 4 , Figure 7 Multiple first driving blocks 22 and second driving blocks 23 are fixedly installed on the inner wall of the pressure cover 21. These first driving blocks 22 and second driving blocks 23 are spaced apart circumferentially along the pressure cover 21, and their bottom sides are inclined. A driving rod 24 is fixedly installed at the top of the support rod 18, located outside the second airbag 19. A column rod 25 is fixedly installed on the driving rod 24. The second driving block 23 is located below two adjacent first driving blocks 22.

[0057] When the pressure cover 21 needs to be rotated, the valve stem 3 drives the valve plate 4 to rise. After the valve stem 3 drives the valve plate 4 to move out of the space between the two valve seats 5, the valve stem 3 continues to rise, causing the rod 25 to press against the second drive block 23. The pressure cover 21 rotates due to the inclined guide on the bottom side of the second drive block 23. Then the valve stem 3 continues to rise, the rod 25 presses against the first drive block 22, and the pressure cover 21 rotates a second time. Afterwards, the valve stem 3 descends, the rod 25 presses against the second drive block 23, and the pressure cover 21 rotates a third time. Each of the three rotations of the pressure cover 21 causes it to move downwards, thereby increasing the amount of air inside the second airbag 19 pressed against the first airbag 1153. By increasing the amount of air inside the second airbag 19 pressed against the first airbag 1153 by the pressure cover 21, the wear of the second airbag 19 and the pressure cover 21 is compensated.

[0058] In this embodiment, when the pressure rod 114 rotates to the side of the valve seat 5 away from the convex ring 6 for limiting, the pressure rod 114 is arranged radially along the valve seat 5, and the pressure rod 114 is located directly above and below the valve seat 5, thereby facilitating the valve plate 4 to descend and squeeze the pressure rod 114 to rotate.

[0059] Reference Figure 4 , Figure 7 A spring clip 26 is fixedly installed on the outer wall of the pressure cover 21, and multiple metal rods 27 are fixedly installed on the top side of the fixing ring 16. The multiple metal rods 27 are arranged around the pressure cover 21 and are used for the spring clip 26 to strike. When the pressure cover 21 is rotated, the spring clip 26 will strike the metal rods 27 to make a sound, reminding the operator of the rotation status of the pressure cover 21, thus serving a certain warning function.

[0060] The implementation principle of a gate valve with replaceable valve seat 5 according to an embodiment of this application is as follows: During the closing process, the valve plate 4 presses against the pressure rod 114, and the pressure rod 114 rotates to avoid the valve plate 4, thereby facilitating the valve plate 4 to enter the two valve seats 5 for sealing. During the opening process, the valve plate 4 moves upward, and the first air bladder 1153 pushes the guide rod 113 to slide. The cooperation between the guide block 1151 and the guide groove 14 causes the pressure rod 114 to rotate back to the side of the valve seat 5 away from the convex ring 6 for limiting, thereby reducing the valve seat 5 from sliding out of the receiving groove 8.

[0061] When it is necessary to replace the valve seat 5, remove the valve cover 2 from the valve body 1. Then, move the lever 114 to easily remove the valve seat 5 from the receiving groove 8 for replacement.

[0062] 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 gate valve with replaceable valve seat (5), comprising a valve body (1) and a valve cover (2), wherein the valve cover (2) is mounted on the top side of the valve body (1), a valve stem (3) is mounted on the valve cover (2), and a valve plate (4) is mounted on the valve stem (3), characterized in that: The valve body (1) is provided with two valve seats (5). On the side of the two valve seats (5) that are far apart from each other, a convex ring (6) and a first sealing ring (7) are coaxially fixedly installed. The first sealing ring (7) is sleeved on the convex ring (6). The valve body (1) has a receiving groove (8) for the convex ring (6) and the valve seat (5) to engage. The valve seat (5) is equipped with a limiting mechanism (11). The limiting mechanism (11) is used to restrict the valve seat (5) from sliding out of the receiving groove (8). On the side of the two valve seats (5) that are close to each other, an annular groove (9) is provided. A second sealing ring (10) is fixedly installed inside the annular groove (9). The limiting mechanism (11) includes a guide cylinder (112), a guide rod (113), a pressure rod (114), and a drive assembly (115). There are multiple guide cylinders (112), guide rods (113), and pressure rods (114), and they are arranged in a one-to-one correspondence. The guide cylinders (112) are all fixedly installed inside the valve body (1) and located outside the receiving groove (8). Multiple guide cylinders (112) are arranged around the valve seat (5). The guide rod (113) slides through the guide cylinder (112). One end of the pressure rod (114) is fixedly connected to one end of the guide rod (113). The pressure rod (114) is arranged perpendicular to the guide rod (113). The pressure rod (114) is used to squeeze the side of the valve seat (5) away from the convex ring (6). The drive assembly (115) is used to drive the guide rod (113) to rotate. The drive assembly (115) includes a guide block (1151), a first airbag (1153), and a blocking block (1152). The blocking block (1152) is fixedly installed at one end of the guide cylinder (112) away from the pressure rod (114). The first airbag (1153) is located inside the guide cylinder (112) and is fixedly installed on the blocking block (1152). The first airbag (1153) is used to push the guide rod (113) away from the blocking block (1152). The guide block (1151) is fixedly installed on the rod body of the guide rod (113). The inner wall of the guide cylinder (112) is provided with a guide groove (14) for the guide block (1151) to slide. The guide groove (14) is inclined from one end to the other end, gradually moving away from the blocking block (1152).

2. A gate valve with replaceable valve seat (5) according to claim 1, characterized in that: The valve seat (5) is provided with a first ring tube (15), the first ring tube (15) is connected to each of the first airbags (1153) on the periphery of the valve seat (5), the valve stem (3) is fixedly fitted with a fixed ring (16), the valve stem (3) is slidably fitted with a movable ring (17), the movable ring (17) is located above the fixed ring (16), the outer wall of the movable ring (17) is fixedly connected to the valve cover (2), and multiple support rods (18) and a second airbag (19) are also fixedly installed on the top side of the fixed ring (16). The support rods (18) pass through the movable ring (17), the second airbag (19) wraps around the support rods (18), and a vent pipe (20) is connected between the second airbag (19) and the first ring tube (15). The second airbag (19) is fitted with a pressure cover (21), and the pressure cover (21) is installed on the top side of the movable ring (17).

3. A gate valve with replaceable valve seat (5) according to claim 2, characterized in that: The pressure cover (21) is threaded into the movable ring (17).

4. A gate valve with replaceable valve seat (5) according to claim 3, characterized in that: Multiple first driving blocks (22) are fixedly installed on the inner wall of the pressure cover (21). The multiple first driving blocks (22) are arranged at intervals along the circumference of the pressure cover (21). The bottom side of each first driving block (22) is inclined. A driving rod (24) is fixedly installed on the top of the support rod (18). The driving rod (24) is located outside the second airbag (19). A column rod (25) is fixedly installed on the driving rod (24).

5. A gate valve with replaceable valve seat (5) according to claim 3, characterized in that: The inner wall of the pressure cover (21) is fixedly installed with a plurality of second driving blocks (23). The plurality of second driving blocks (23) are arranged at intervals along the circumference of the pressure cover (21). The second driving blocks (23) are located below two adjacent first driving blocks (22). The bottom sides of the second driving blocks (23) are all inclined.

6. A gate valve with replaceable valve seat (5) according to claim 3, characterized in that: The outer wall of the pressure cover (21) is fixedly installed with a spring sheet (26), and multiple metal rods (27) are fixedly installed on the top side of the fixing ring (16). The multiple metal rods (27) are arranged around the pressure cover (21), and the metal rods (27) are used for the spring sheet (26) to strike.

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