Gate valve with soft seal

Abstract

The utility model discloses a gate valve adopting soft seal, including valve body, valve cover and gate lever, the inside of valve body is provided with gate valve chamber, the inside of valve body of gate valve chamber both sides is provided with pneumatic cylinder cavity, and the both sides of gate lever all are provided with L type connecting rod, and two L type connecting rod both ends respectively extend to the inside of two pneumatic cylinder cavities and are connected with piston, and the bottom of pneumatic cylinder cavity all is provided with connecting air pipe, and the other end of connecting air pipe respectively extends to the inside of two guide rail grooves and is connected with telescopic rubber air bag, and the top of telescopic rubber air bag is provided with sealing plate. The utility model discloses through setting up L type connecting rod in the both sides of gate lever and connecting to the piston in pneumatic cylinder cavity, through connecting air pipe and injecting compressed air into telescopic rubber air bag, so that sealing plate can completely adhere to the sealing edge outer wall of both sides of gate plate body, effectively avoid the problem of not tight sealing of traditional gate valve in the sealing process due to mechanical wear, and significantly improve the sealing performance of gate valve.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, specifically a gate valve employing a soft seal. Background Technology

[0002] Gate valves, as core components controlling the flow of fluids in fluid transport systems, are widely used in chemical, petroleum, water supply and drainage, heating, and power industries. Their sealing performance and service life directly determine the safety, stability, and system operating efficiency of fluid transport. In actual operating conditions, gate valves must frequently withstand changes in medium pressure and temperature, as well as periodic opening and closing operations. Therefore, stringent requirements are placed on their sealing reliability, operational flexibility, and wear resistance.

[0003] Currently, the mainstream gate valves on the market are mainly divided into two categories: hard-seal gate valves and traditional soft-seal gate valves. However, both types of products have significant technical defects during long-term use, making it difficult to simultaneously meet the dual requirements of sealing effect and service life.

[0004] Hard-seal gate valves typically use metal for their sealing surfaces, achieving a seal through rigid metal-to-metal contact between the gate and the valve body. The core problem with this structure is that the metal sealing surface inevitably develops scratches, dents, or deformation due to friction during periodic opening and closing. This is especially problematic when conveying media containing impurities, as these impurities can easily become embedded in the gaps between the sealing surfaces, accelerating wear. Over time, the sealing surface's fit precision decreases, making media leakage highly likely, particularly under low-pressure conditions. To ensure a good seal, the contact pressure between the gate and the sealing surface must be increased, leading to a significant increase in frictional resistance during gate movement, resulting in high operating torque and requiring considerable effort for manual operation. Simultaneously, excessive friction further exacerbates the wear of the sealing surface, creating a vicious cycle of "poor sealing → increased pressure → further wear." Utility Model Content

[0005] The purpose of this invention is to provide a gate valve employing a soft seal to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a gate valve with soft sealing, comprising a valve body, a valve cover and a gate rod, wherein a gate valve cavity is provided inside the valve body, guide rail grooves are provided on the inner walls of the gate valve cavity on opposite sides, and a valve cover is provided on the top of the valve body, a gate rod is provided at the center of the valve cover, and the bottom end of the gate rod extends into the interior of the gate valve cavity and is provided with a gate plate body with sealing edges on both sides;

[0007] The valve body on both sides of the gate valve cavity is provided with air cylinder cavities, and L-shaped connecting rods are provided on both sides of the gate rod. The two ends of the two L-shaped connecting rods extend into the interior of the two air cylinder cavities and are connected to pistons. The bottom of each air cylinder cavity is provided with a connecting air pipe. The other end of the connecting air pipe extends into the interior of two guide rail grooves and is connected to a telescopic rubber air bladder. The top of the telescopic rubber air bladder is provided with a sealing plate.

[0008] Preferably, the top of the gate rod extends to the top of the valve cover and is provided with a threaded section. A movable sleeve is installed in the middle of the top of the valve cover through a bearing seat, and the interior of the movable sleeve is provided with an internal thread that matches the threaded section.

[0009] Preferably, the movable sleeve is provided with handles symmetrically on both sides, and a locking bolt is provided on the outer wall of the movable sleeve between the two handles.

[0010] Preferably, a receiving cavity is provided inside the valve body above the gate valve cavity.

[0011] Preferably, both sides of the valve cover are provided with strip grooves for the L-shaped connecting rod to pass through, and the connection between the L-shaped connecting rod and the valve body is provided with a sealing gasket.

[0012] Preferably, the cylinder cavity has a cylindrical structure, and the outer wall of the piston is provided with an O-ring seal, the outer diameter of which matches the inner diameter of the cylinder cavity.

[0013] Preferably, the inner wall of the sealing plate is uniformly covered with a sealing gasket.

[0014] Preferably, both sides of the valve body are provided with connecting pipes that communicate with the gate valve cavity, and the top of each connecting pipe is provided with a flange.

[0015] Preferably, the sealing edges on both sides of the gate body slide against the inner wall of the guide rail groove, and the height of the sealing edges is consistent with the height of the gate body.

[0016] Preferably, the length of the telescopic rubber airbag is adapted to the length of the guide rail groove, and the end of the telescopic rubber airbag away from the connecting air pipe is fixedly connected to the bottom inner wall of the guide rail groove.

[0017] This invention provides a gate valve employing a soft seal, which, compared to existing technologies, has the following significant advantages:

[0018] 1. This utility model sets L-shaped connecting rods on both sides of the gate arm and connects them to the piston in the air cylinder cavity. Compressed air is injected into the telescopic rubber air bladder through the connecting air pipe, so that the sealing plate can completely fit the sealing edge outer wall on both sides of the gate body. This design effectively avoids the problem of poor sealing caused by mechanical wear during the sealing process of traditional gate valves, significantly improves the sealing performance of the gate valve, reduces leakage, and extends the service life of the gate valve.

[0019] 2. During the opening and closing of the gate, the L-shaped connecting rod drives the piston to move, controlling the expansion and contraction of the telescopic rubber air bladder. This causes the distance between the sealing edge and the sealing plate to change gradually, avoiding the large frictional force generated by the direct contact between the gate and the valve body in traditional gate valves. This design effectively reduces frictional losses during the opening and closing of the gate, reduces energy consumption, and improves the operational flexibility and service life of the gate valve. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the internal cross-sectional structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the main structure of this utility model;

[0023] Figure 3 This is a schematic diagram of the guide rail groove structure of this utility model;

[0024] Figure 4 This is a schematic diagram of the internal structure of the movable sleeve of this utility model;

[0025] In the diagram: 1. Gate arm; 2. Strip groove; 3. Valve cover; 4. Locking bolt; 5. Threaded section; 6. Movable sleeve; 7. Hand lever; 8. L-shaped connecting rod; 9. Piston; 10. Air cylinder cavity; 11. Connecting air pipe; 12. Gate valve cavity; 13. Valve body; 14. Guide rail groove; 15. Gate body; 16. Sealing edge; 17. Receiving cavity; 18. Flange; 19. Connecting pipe; 20. Bearing seat; 21. Telescopic rubber air bladder; 22. Internal thread; 23. Sealing gasket; 24. Sealing plate. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0027] Please see Figure 1-4 An embodiment of this utility model is provided: a gate valve with soft sealing, including a valve body 13, a valve cover 3 and a gate stem 1. The valve body 13 is provided with a gate valve cavity 12 inside. The inner walls of the gate valve cavity 12 on opposite sides are provided with guide rail grooves 14. The valve body 13 above the gate valve cavity 12 is provided with a receiving cavity 17 inside.

[0028] Both sides of the valve body 13 are provided with connecting pipes 19 that communicate with the gate valve cavity 12, and the top of each connecting pipe 19 is provided with a flange 18.

[0029] Valve body 13: Valve body 13 is the main part of the gate valve. It is made of high-strength metal material and has good corrosion resistance and mechanical strength. The valve body 13 has a gate valve cavity 12 inside, which is used to accommodate the gate and its movement.

[0030] Gate valve chamber 12: The gate valve chamber 12 is located inside the valve body 13. Guide rail grooves 14 are provided on the inner walls on both sides. The design of the gate valve chamber 12 ensures the smooth movement of the gate and the sealing performance.

[0031] Guide rail groove 14: The guide rail groove 14 is located on both sides of the inner wall of the gate valve cavity 12 and is used to guide the up and down movement of the gate. The guide rail groove 14 is made of wear-resistant material to ensure that it will not deform during long-term use.

[0032] Storage cavity 17: The storage cavity 17 is located inside the valve body 13 above the gate valve cavity 12 and is used to store the gate body 15 and its related components.

[0033] Connecting pipe 19: Both sides of the valve body 13 are provided with connecting pipes 19 that communicate with the gate valve cavity 12. The connecting pipes 19 are used to connect the pipeline system to ensure the flow of the medium.

[0034] Flange 18: Flange 18 is provided at the top of both butt joint pipes 19. Flange 18 is used for flange connection with external pipes to ensure the sealing and stability of the connection.

[0035] A valve cover 3 is provided on the top of the valve body 13. A gate rod 1 is provided at the center of the valve cover 3. The bottom end of the gate rod 1 extends into the interior of the gate valve cavity 12 and is provided with a gate plate body 15 with sealing edges 16 on both sides. The sealing edges 16 on both sides of the gate plate body 15 slide and fit against the inner wall of the guide rail groove 14, and the height of the sealing edges 16 is the same as the height of the gate plate body 15.

[0036] The top of the gate rod 1 extends to the top of the valve cover 3 and is provided with a threaded section 5. A movable sleeve 6 is installed in the middle of the top of the valve cover 3 through a bearing seat 20, and the interior of the movable sleeve 6 is provided with an internal thread 22 that matches the threaded section 5.

[0037] The movable sleeve 6 is symmetrically provided with handles 7 on both sides, and locking bolts 4 are provided on the outer wall of the movable sleeve 6 between the two handles 7.

[0038] The guide grooves 14 are located on both sides of the inner wall of the valve body 13 and are symmetrically distributed. The inner wall of the guide grooves 14 is smooth to ensure that the sealing edge 16 of the gate body 15 can slide smoothly in it. The depth of the guide grooves 14 is slightly greater than the thickness of the sealing edge 16 to ensure that the gate body 15 will not get stuck during the opening and closing process.

[0039] The top of the gate rod 1 extends to the top of the valve cover 3 and is provided with a threaded section 5. A movable sleeve 6 is installed in the middle of the top of the valve cover 3 through a bearing seat 20. The inner wall of the bearing seat 20 is provided with a bearing to ensure that the movable sleeve 6 can rotate flexibly. The movable sleeve 6 is provided with an internal thread 22 that matches the threaded section 5. By rotating the movable sleeve 6, the gate rod 1 can move up and down.

[0040] The movable sleeve 6 is symmetrically provided with handles 7 on both sides. The handles 7 are connected to the movable sleeve 6 by hinge, which makes it easy for the operator to manually rotate the movable sleeve 6. The outer wall of the movable sleeve 6 between the two handles 7 is provided with locking bolts 4. The locking bolts 4 are used to fix the position of the movable sleeve 6 and prevent it from rotating accidentally during operation.

[0041] The valve body 13 on both sides of the gate valve cavity 12 is provided with air cylinder cavities 10, and L-shaped connecting rods 8 are provided on both sides of the gate rod 1. The two ends of the two L-shaped connecting rods 8 extend into the interior of the two air cylinder cavities 10 and are connected to pistons 9. The valve cover 3 is provided with strip grooves 2 for the L-shaped connecting rods 8 to pass through, and sealing gaskets are provided at the connection between the L-shaped connecting rods 8 and the valve body 13.

[0042] The cylinder cavity 10 has a cylindrical structure, and the outer wall of the piston 9 is provided with an O-ring seal. The outer diameter of the O-ring seal matches the inner diameter of the cylinder cavity 10.

[0043] Air cylinder cavity 10: The air cylinder cavity 10 has a cylindrical structure and is used to accommodate the piston 9. The inner diameter of the air cylinder cavity 10 matches the outer diameter of the piston 9 to ensure that the piston 9 can move smoothly inside the air cylinder cavity 10.

[0044] Piston 9: The outer wall of piston 9 is provided with an O-ring seal. The outer diameter of the O-ring seal matches the inner diameter of the air cylinder cavity 10, thereby achieving a good sealing effect. Piston 9 is connected to the gate rod 1 through an L-shaped connecting rod 8.

[0045] L-shaped connecting rod 8: The two ends of the L-shaped connecting rod 8 extend into the interior of the two air cylinder cavities 10 respectively and are connected to the piston 9. The design of the L-shaped connecting rod 8 enables it to achieve bidirectional movement within the air cylinder cavity 10.

[0046] Slot 2: The design of slot 2 ensures that the L-shaped link 8 will not be obstructed during movement. At the same time, the width of slot 2 is slightly larger than the diameter of the L-shaped link 8 to ensure its free movement.

[0047] Sealing gaskets: Sealing gaskets are provided at the connection between the L-shaped connecting rod 8 and the valve body 13 to prevent fluid medium leakage.

[0048] The bottom of the air cylinder cavity 10 is provided with a connecting air pipe 11. The other end of the connecting air pipe 11 extends into the interior of two guide rail grooves 14 and is connected to a telescopic rubber air bag 21. The top of the telescopic rubber air bag 21 is provided with a sealing plate 24, and the inner wall of the sealing plate 24 is evenly covered with a sealing gasket 23.

[0049] The length of the telescopic rubber airbag 21 is adapted to the length of the guide rail groove 14, and the end of the telescopic rubber airbag 21 away from the connecting air pipe 11 is fixedly connected to the bottom inner wall of the guide rail groove 14. When the telescopic rubber airbag 21 is inflated, the sealing plate 24 can completely fit the outer wall of the sealing edge 16 on both sides of the gate body 15.

[0050] The bottom of the air cylinder cavity 10 is provided with a connecting air pipe 11. The air cylinder cavity 10 is made of high-strength material to ensure its pressure resistance and sealing performance. The connecting air pipe 11 is made of flexible material, such as pressure-resistant rubber or plastic, to ensure its flexibility and reliability under different working conditions. One end of the connecting air pipe 11 is fixed to the bottom of the air cylinder cavity 10 by threaded connection or snap-fit ​​connection to ensure a firm and sealed connection.

[0051] The other end of the connecting air tube 11 extends into the interior of two guide rail grooves 14. The guide rail grooves 14 are located on both sides of the air cylinder cavity 10 and are symmetrically distributed. The inner wall of the guide rail groove 14 is smooth to reduce the frictional resistance of the telescopic rubber airbag 21 during movement. The telescopic rubber airbag 21 is connected to the end of the connecting air tube 11 inside the guide rail groove 14.

[0052] The telescopic rubber airbag 21 is made of a highly elastic material, which has good elasticity and pressure resistance. The length of the telescopic rubber airbag 21 is adapted to the length of the guide rail groove 14, ensuring that it can completely fill the space of the guide rail groove 14 when it is inflated. The end of the telescopic rubber airbag 21 away from the connecting air tube 11 is fixedly connected to the bottom inner wall of the guide rail groove 14 by adhesive or snap-fit ​​connection to ensure a firm connection.

[0053] The top of the telescopic rubber airbag 21 is provided with a sealing plate 24. The sealing plate 24 is made of a rigid material, such as metal or hard plastic, to ensure its rigidity and sealing performance during operation. The inner wall of the sealing plate 24 is uniformly covered with sealing gaskets 23. The sealing gaskets 23 are made of high temperature resistant and wear-resistant rubber material to ensure their sealing performance under high temperature and high pressure environment.

[0054] When the gas in the air cylinder cavity 10 enters the telescopic rubber airbag 21 through the connecting air pipe 11, the telescopic rubber airbag 21 inflates and expands, pushing the sealing plate 24 to move. Since the length of the telescopic rubber airbag 21 is adapted to the length of the guide rail groove 14, the sealing plate 24 can completely fit the outer wall of the sealing edge 16 on both sides of the gate body 15 during the inflation process, thereby achieving a sealing effect.

[0055] After the sealing plate 24 is completely fitted to the outer wall of the sealing edge 16 on both sides of the gate body 15, the sealing gasket 23 plays a further sealing role, ensuring that the gas in the air cylinder cavity 10 will not leak. At this time, the pressure in the air cylinder cavity 10 is transmitted to the gate body 15 through the sealing plate 24, thereby achieving stable support for the gate body 15.

[0056] In the initial state of use, the gate body 15 is housed in the receiving cavity 17 inside the valve body 13. The medium can enter the gate valve cavity 12 through the connecting pipes 19 on both sides of the valve body 13 to achieve normal flow. At this time, the telescopic rubber airbag 21 is in an uninflated and contracted state, and the sealing plate 24 does not contact the sealing edge 16 on both sides of the gate body 15.

[0057] The operator holds the levers 7 on both sides of the movable sleeve 6 with both hands and rotates the levers 7 clockwise. Since the movable sleeve 6 is installed on the top of the valve cover 3 through the bearing seat 20, and the internal thread 22 inside the movable sleeve 6 matches the threaded section 5 at the top of the gate rod 1, the rotating movable sleeve 6 will drive the gate rod 1 to move downward in the vertical direction.

[0058] When the gate arm 1 moves downward, the gate plate body 15 connected to its bottom end slides downward along the guide rail grooves 14 on both sides of the inner wall of the gate valve cavity 12. The sealing edges 16 on both sides of the gate plate body 15 keep sliding and fitting with the inner wall of the guide rail groove 14. The guiding effect of the guide rail groove 14 ensures that the gate plate body 15 will not deviate or get stuck.

[0059] As the gate lever 1 moves downward, the L-shaped connecting rods 8 connected to its two sides move downward synchronously along the strip grooves 2 on both sides of the valve cover 3 (the strip grooves 2 provide movement space for the L-shaped connecting rods 8, and the sealing gasket at the connection between the L-shaped connecting rods 8 and the valve body 13 can prevent medium leakage); the end of the L-shaped connecting rod 8 extending into the air cylinder cavity 10 drives the piston 9 to press downward along the inner wall of the cylindrical air cylinder cavity 10. The O-ring seal on the outer wall of the piston 9 matches the inner diameter of the air cylinder cavity 10, ensuring that the gas in the air cylinder cavity 10 will not leak from the gap between the piston 9 and the cavity wall.

[0060] Under the compression of the piston 9, the gas in the air cylinder cavity 10 is transported through the connecting air pipe 11 at the bottom of the air cylinder cavity 10 to the telescopic rubber air bag 21 inside the guide rail groove 14; as the gas is continuously injected, the telescopic rubber air bag 21 gradually inflates.

[0061] During the expansion of the telescopic rubber airbag 21, the sealing plate 24 connected to its top is gradually pushed towards the sealing edge 16 of the gate body 15 until the sealing gasket 23 laid on the inner wall of the sealing plate 24 completely adheres to the outer wall of the sealing edge 16, forming a reliable soft seal and blocking the flow channel of the medium in the gate valve cavity 12.

[0062] After the sealing plate 24 and the sealing edge 16 are fully in contact, stop rotating the lever 7, tighten the locking bolt 4 on the outer wall of the movable sleeve 6 between the two levers 7, fix the position of the movable sleeve 6 by the locking bolt 4, prevent it from rotating accidentally and causing the gate lever 1 to shift, and ensure that the valve remains in a stable closed state.

[0063] When opening, first loosen the locking bolt 4 on the outer wall of the movable sleeve 6 counterclockwise to release the fixed restriction of the movable sleeve 6, so that the movable sleeve 6 can rotate freely.

[0064] The operator holds the lever 7 with both hands and rotates the lever 7 counterclockwise; the rotating sleeve 6 drives the gate arm 1 to move upward in the vertical direction through the engagement of the internal thread 22 and the threaded section 5.

[0065] When the gate arm 1 moves upward, it drives the gate plate body 15 to slide upward along the guide rail groove 14, gradually disengaging from the flow channel of the gate valve cavity 12 and moving towards the receiving cavity 17; at the same time, the L-shaped connecting rods 8 on both sides of the gate arm 1 move upward along the strip groove 2, pulling the piston 9 to move upward along the inner wall of the air cylinder cavity 10, and a negative pressure is formed inside the air cylinder cavity 10.

[0066] The negative pressure in the air cylinder cavity 10 causes the gas in the telescopic rubber airbag 21 to flow back into the air cylinder cavity 10 through the connecting air pipe 11. The telescopic rubber airbag 21 gradually deflates and contracts, and the sealing plate 24 at its top separates from the sealing edges 16 on both sides of the gate body 15, thus releasing the seal.

[0067] Continue to rotate the lever 7 counterclockwise until the gate lever 1 drives the gate plate 15 to be completely retracted into the receiving cavity 17. At this time, the flow channel of the gate valve cavity 12 is fully opened, and the medium can re-enter the gate valve cavity 12 through the connecting pipe 19 to achieve normal flow. Stop rotating the lever 7 to complete the valve opening operation (if it needs to be opened for a long time, the locking bolt 4 can be slightly tightened to fix the movable sleeve 6 to prevent it from rotating randomly due to vibration).

[0068] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0069] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0070] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0071] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A gate valve employing a soft seal, comprising a valve body (13), a valve cover (3), and a gate stem (1), characterized in that: The valve body (13) is provided with a gate valve cavity (12) inside. The inner walls of the gate valve cavity (12) on both sides are provided with guide rail grooves (14). The valve body (13) is provided with a valve cover (3) at the top. A gate rod (1) is provided at the center of the valve cover (3). The bottom end of the gate rod (1) extends into the interior of the gate valve cavity (12) and is provided with a gate plate body (15) with sealing edges (16) on both sides. The valve body (13) on both sides of the gate valve cavity (12) is provided with an air cylinder cavity (10), and both sides of the gate rod (1) are provided with L-shaped connecting rods (8). The two ends of the two L-shaped connecting rods (8) extend into the interior of the two air cylinder cavities (10) and are connected to pistons (9). The bottom of the air cylinder cavity (10) is provided with a connecting air pipe (11). The other end of the connecting air pipe (11) extends into the interior of the two guide rail grooves (14) and is connected to a telescopic rubber airbag (21). The top of the telescopic rubber airbag (21) is provided with a sealing plate (24).

2. A gate valve employing a soft seal according to claim 1, characterized in that: The top of the gate rod (1) extends to the top of the valve cover (3) and is provided with a threaded section (5). A movable sleeve (6) is installed in the middle of the top of the valve cover (3) through a bearing seat (20), and the interior of the movable sleeve (6) is provided with an internal thread (22) that matches the threaded section (5).

3. A gate valve employing a soft seal according to claim 2, characterized in that: The movable sleeve (6) is symmetrically provided with handles (7) on both sides, and locking bolts (4) are provided on the outer wall of the movable sleeve (6) between the two handles (7).

4. A gate valve employing a soft seal according to claim 1, characterized in that: The valve body (13) above the gate valve cavity (12) is provided with a receiving cavity (17).

5. A gate valve employing a soft seal according to claim 1, characterized in that: Both sides of the valve cover (3) are provided with strip grooves (2) for the L-shaped connecting rod (8) to pass through, and sealing gaskets are provided at the connection between the L-shaped connecting rod (8) and the valve body (13).

6. A gate valve employing a soft seal according to claim 1, characterized in that: The cylinder cavity (10) has a cylindrical structure, and the outer wall of the piston (9) is provided with an O-ring seal, the outer diameter of which matches the inner diameter of the cylinder cavity (10).

7. A gate valve employing a soft seal according to claim 1, characterized in that: The inner wall of the sealing plate (24) is uniformly covered with sealing gaskets (23).

8. A gate valve employing a soft seal according to claim 1, characterized in that: Both sides of the valve body (13) are provided with connecting pipes (19) that communicate with the gate valve cavity (12), and the top of each connecting pipe (19) is provided with a flange (18).

9. A gate valve employing a soft seal according to claim 1, characterized in that: The sealing edges (16) on both sides of the gate body (15) slide against the inner wall of the guide rail groove (14), and the height of the sealing edges (16) is consistent with the height of the gate body (15).

10. A gate valve employing a soft seal according to claim 1, characterized in that: The length of the telescopic rubber airbag (21) is adapted to the length of the guide rail groove (14), and the end of the telescopic rubber airbag (21) away from the connecting air tube (11) is fixedly connected to the bottom inner wall of the guide rail groove (14).

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