Multiple closed valve plate structure and soft sealing gate valve

Abstract

The application discloses a multiple closed valve plate structure and a soft sealing gate valve, and relates to the technical field of pipeline valves. The multiple closed valve plate structure comprises a valve plate shell, one end of the valve plate shell is provided with a mounting groove, a moving sleeve is slidably arranged in the mounting groove, a sealing rubber sleeve is connected to one side of the moving sleeve, a moving block is slidably arranged in the moving sleeve, the cross-sectional area of the side surface of the moving block is larger than that of the moving sleeve, a compression spring is arranged in the mounting groove, and a reverse transmission mechanism is arranged between the moving block and the moving sleeve. When the valve plate is completely closed, the sealing rubber sleeve is pushed out to the outside by the fluid pressure of the water inlet side, when the contact surfaces of the two ends of the valve plate shell have gaps or looseness, the sealing rubber sleeve is extruded to the outside by the fluid pressure and adheres to the inner wall of the connection between the valve plate shell and the gate valve water inlet pipeline, and the secondary sealing effect is realized by the fluid pressure, so that the sealing capacity is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline valves, in particular to a multiple sealing valve plate structure and a soft sealing gate valve. BACKGROUND

[0002] In industrial valves, the soft sealing gate valve is a commonly used gate-off valve, the movement direction of the gate plate is perpendicular to the fluid direction, and the soft sealing gate valve is usually used for cutting off and flowing through the main pipeline, and basically does not control the flow. With the development of technology, there are various types of soft sealing gate valves.

[0003] The soft sealing gate valve relies on the valve plate to cut off the inlet and outlet, such as the gate valve disclosed in patent No. CN114542741A, which comprises a valve body, a valve rod and a gate plate connected to one end of the valve rod and used for blocking or opening the fluid passage in the valve body. The valve rod passes through the bracket and the cylinder connected with the valve body in turn, and the valve rod is connected with a transposition piece. A limiting portion is arranged in the bracket, and the limiting portion and the top of the inner cavity of the bracket form a transposition gap. When the gate valve is opened, the transposition piece can only move in the vertical direction along the limiting portion to limit the movement of the valve rod in the vertical direction. When the gate plate rises into the cylinder and the transposition piece rises into the transposition gap, the valve rod can rotate 180° under the action of external force, and then when the gate plate descends to the position of blocking the fluid passage, the inlet sealing surface and the outlet sealing surface are exchanged. Prevent the fluid pressure difference on both sides of the gate plate from only wearing out one side of the sealing surface, and prevent the gate valve from leaking.

[0004] The sealing of the gate valve needs to ensure the sealing between the gate plate and the valve body. The above device and the existing gate valve generally set the contact surface between the valve body and the gate plate as a wedge shape, and sealing can be achieved by pressure. However, when the gate plate and the valve body are loose, leakage is easy to occur, and the sealing effect is poor. SUMMARY

[0005] The purpose of the present application is to provide a multiple sealing valve plate structure and a soft sealing gate valve to solve the problems raised in the background art.

[0006] To achieve the above purpose, the present application provides the following technical scheme: a multiple sealing valve plate structure, comprising a valve plate shell, the valve plate shell is wedge-shaped, one end of the valve plate shell is provided with a mounting groove, the mounting groove is towards the water inlet side of the gate valve, a moving sleeve is slidably arranged in the mounting groove, the moving sleeve is connected with a sealing rubber sleeve on the side towards the opening of the mounting groove, and the outer diameter of the sealing rubber sleeve is smaller than the inner diameter of the mounting groove, a moving block is slidably arranged in the moving sleeve, the cross-sectional area of the side surface of the moving block is larger than that of the moving sleeve, a compression spring is arranged in the mounting groove, and the two ends of the compression spring are respectively abutted with the moving block and the groove bottom of the mounting groove, a reverse transmission mechanism is arranged between the moving block and the moving sleeve for moving them in opposite directions.

[0007] Preferably, the reverse transmission mechanism comprises a transmission gear rotatingly arranged inside the mounting groove, the moving block is fixed with a first rack, and the first rack is engaged with the transmission gear, the moving sleeve is fixed with an extension rod, and the extension rod is fixed with a second rack, and the second rack is engaged with the transmission gear, and the first rack and the second rack are distributed in parallel.

[0008] Preferably, the valve plate shell is provided with a mounting opening communicated with the mounting groove on the side away from the mounting groove, the outer side of the mounting opening is provided with a cover plate, the inner side of the cover plate is fixed with a connecting seat penetrating through the mounting opening, the transmission gear is rotatingly arranged on the connecting seat, the outer side of the valve plate shell is provided with two symmetrical and obliquely distributed clamping plates, the cover plate is clamped into the two clamping plates from the side, the outer side of the mounting opening is provided with a sealing embedding groove, and a sealing rubber ring is embedded in the sealing embedding groove, and the outer side of the sealing rubber ring abuts against the cover plate.

[0009] Preferably, the side of the connecting seat is fixed with a fixed shaft, the fixed shaft is provided with a rotating groove, the transmission gear is sleeved on the fixed shaft, the side of the transmission gear is fixed with two symmetrical and inwardly extending limiting blocks, the inner side of the limiting blocks is located in the rotating groove, and the side of the rotating groove is provided with two notched grooves matched with the limiting blocks.

[0010] Preferably, the outer side of the moving sleeve is provided with an outer embedding groove, and an outer sealing ring is arranged in the outer embedding groove, the outer side of the outer sealing ring abuts against the inner side of the mounting groove, the inner side of the moving sleeve is provided with an inner embedding groove, and an inner sealing ring is arranged in the inner embedding groove, and the inner side of the inner sealing ring abuts against the outer wall of the moving block.

[0011] A soft sealing gate valve comprises a water inlet pipe, a water outlet pipe and a bottom shell connecting the water inlet pipe and the water outlet pipe, the upper end of the bottom shell is fixed with an upper shell, a sleeve pipe is rotatingly arranged in the middle of the upper shell, a rotating handle is fixed to the upper end of the sleeve pipe, a threaded rod is threadedly connected to the lower end of the sleeve pipe, a multiple sealing valve plate structure is fixed to the lower end of the threaded rod, and a mounting groove faces the water inlet pipe and has the same inner diameter as the water inlet pipe.

[0012] Preferably, the inner side of the upper end of the upper shell is provided with a widening groove, the outer side of the sleeve pipe is provided with a stop ring, the stop ring is located inside the widening groove, a thrust bearing is arranged above the stop ring, the lower end of the stop ring is sleeved with a fixed plate, a plurality of first mounting holes are arranged on the upper shell in a circumferential distribution, a plurality of second mounting holes are arranged on the fixed plate in a circumferential distribution, and the fixed plate is fixed to the inner wall of the upper shell by bolts.

[0013] Preferably, the two sides of the valve plate shell are provided with guide grooves, and guide ribs are fixed to the inner wall of the bottom shell, and the guide grooves are sleeved outside the corresponding guide ribs.

[0014] Preferably, the lower end of the upper shell is provided with a first connecting flange, the upper end of the bottom shell is provided with a second connecting flange, the first connecting flange and the second connecting flange are fixed by bolts, the outer side of the threaded rod is sleeved with an elastic sealing cover, the outer edge of the elastic sealing cover is fixed between the first connecting flange and the second connecting flange, the bottom of the threaded rod is threadedly connected with a compression ring, and the lower end of the compression ring is clamped with the upper surface of the valve plate shell on both sides of the inner edge of the elastic sealing cover.

[0015] Compared with the prior art, the beneficial effects of the present application are:

[0016] When the valve plate is completely closed, the fluid pressure on the water inlet side surges and is accompanied by water hammer phenomenon, the compression spring is compressed, at this time the moving block moves to the inside of the mounting groove, the moving sleeve moves to the outside of the mounting groove, and the sealing rubber sleeve is pushed outwards, when the gap or looseness occurs on the contact surface of the two ends of the valve plate shell, the sealing rubber sleeve is extruded outward by the fluid pressure and adheres to the contact surface of the valve plate shell and the internal structure of the gate valve, thereby realizing the secondary sealing effect and improving the sealing capacity.

[0017] Meanwhile, during installation, the transmission gear can be moved to the side to prevent it from interfering with the first rack and the second rack, after the first rack and the second rack are installed in place, the cover plate is slid to the side and fixed, at this time the transmission gear can be moved to the side between the first rack and the second rack and engaged with them, so that installation is convenient, and similarly, during disassembly, the transmission gear is first moved to the side, so that the first rack and the second rack can be removed, and the disassembly operation is simple.

[0018] In addition, the elastic sealing cover can prevent fluid from flowing out of the gap between the threaded rod and the sleeve, and during installation of the elastic sealing cover, the outer edge of the elastic sealing cover is fixed by the first connecting flange and the second connecting flange, and the inner edge of the elastic sealing cover is fixed by the compression ring and the valve plate shell, so that the fixing method is simple and the installation is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall shaft side structure of the soft sealing gate valve in the present application;

[0020] Figure 2 It is a schematic diagram of the internal structure of the soft sealing gate valve in the present application;

[0021] Figure 3 It is a schematic diagram of the cross-sectional structure of the valve plate in the present application;

[0022] Figure 4 It is a schematic diagram of the structure of the cover plate in the present application;

[0023] Figure 5 It is a schematic diagram of the disassembled structure of the transmission gear in the present application;

[0024] Figure 6 It is a split structure schematic diagram of the mobile sleeve and the mobile block in the application;

[0025] Figure 7 It is a split structure schematic diagram of the upper shell in the application;

[0026] Figure 8 It is a split structure schematic diagram of the bottom shell in the application.

[0027] In the figure: 1, water inlet pipe; 2, water outlet pipe; 3, bottom shell; 4, upper shell; 5, sleeve; 6, rotating handle; 7, threaded rod; 8, valve plate shell; 9, installation groove; 10, mobile sleeve; 11, sealing rubber sleeve; 12, mobile block; 13, compression spring; 14, transmission gear; 15, first rack; 16, extension rod; 17, second rack; 18, installation port; 19, cover plate; 20, connecting seat; 21, clamping plate; 22, sealing embedded groove; 23, sealing rubber ring; 24, fixed shaft; 25, rotating groove; 26, notch groove; 27, limiting block; 28, outer sealing ring; 29, inner sealing ring; 30, widening groove; 31, blocking ring; 32, thrust bearing; 33, fixed plate; 34, first installation hole; 35, second installation hole; 36, guide rib; 37, guide groove; 38, first connecting flange; 39, second connecting flange; 40, elastic sealing cover; 41, compression ring. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the application will be apparently and completely described below with the accompanying drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0029] As Figures 3-6 shown, the application provides a technical solution: a multiple closed valve plate structure, comprising a valve plate shell 8, the valve plate shell 8 is wedge-shaped, one end of the valve plate shell 8 is provided with an installation groove 9, the installation groove 9 is towards the water inlet side of the gate valve, a mobile sleeve 10 is slidably arranged in the installation groove 9, a sealing rubber sleeve 11 is connected to one side of the mobile sleeve 10, the outer diameter of the sealing rubber sleeve 11 is smaller than the inner diameter of the installation groove 9, a mobile block 12 is slidably arranged in the mobile sleeve 10, the cross-sectional area of the side surface of the mobile block 12 is larger than the cross-sectional area of the side surface of the mobile sleeve 10, a compression spring 13 is arranged in the installation groove 9, and the two ends of the compression spring 13 are respectively abutted with the mobile block 12 and the groove bottom of the installation groove 9, a reverse transmission mechanism is arranged between the mobile block 12 and the mobile sleeve 10, for moving them in opposite directions.

[0030] It should be noted that when the fluid enters the gate valve on the water inlet side, the fluid will impact the moving sleeve 10 and the moving block 12 inside the installation groove 9 during the closing process. Under the action of the compression spring 13, it is difficult for the impact force of the fluid to move the moving block 12. Under the action of the transmission mechanism, the moving sleeve 10 will remain transversely stationary in the case that the moving block 12 does not move. When the valve plate is completely closed, the fluid pressure on the water inlet side increases rapidly and is accompanied by water hammer phenomenon. At this time, the pressure is greater than the pressure of the compression spring 13. Because the side cross-sectional area of the moving block 12 is greater than the side cross-sectional area of the moving sleeve 10, the compression spring 13 is compressed. At this time, the moving block 12 moves towards the inside of the installation groove 9, and the moving sleeve 10 moves towards the outside of the installation groove 9 (under the action of the reverse transmission mechanism). The sealing rubber sleeve 11 is pushed outwards. When the two end contact surfaces of the valve plate shell 8 can realize sealing in the valve, the pressure on both sides of the sealing rubber sleeve 11 is balanced. When the two end contact surfaces of the valve plate shell 8 have gaps or looseness, the fluid pressure will extrude the sealing rubber sleeve 11 outwards and adhere to the contact surface between the valve plate shell 8 and the internal structure of the gate valve. Relying on the fluid pressure to realize the secondary sealing effect, thereby improving the sealing capacity.

[0031] As shown in Figure 3 , the reverse transmission mechanism includes a transmission gear 14 rotatably arranged inside the installation groove 9. The moving block 12 is fixed with a first rack 15, and the first rack 15 is engaged with the transmission gear 14. The moving sleeve 10 is fixed with an extension rod 16, and the extension rod 16 is fixed with a second rack 17, and the second rack 17 is engaged with the transmission gear 14. The first rack 15 and the second rack 17 are distributed in parallel.

[0032] It should be noted that under the action of the fluid pressure, when the moving block 12 moves towards the inside of the installation groove 9, the first rack 15 will drive the transmission gear 14 to rotate. Through the transmission of the transmission gear 14, the second rack 17 will move towards the outside of the installation groove 9. Under the action of the extension rod 16, the moving sleeve 10 and the second rack 17 will move outwards synchronously, realizing the reverse transmission effect.

[0033] As shown in Figure 4 , the side of the valve plate shell 8 away from the installation groove 9 is provided with an installation opening 18 communicating with the installation groove 9. The outside of the installation opening 18 is provided with a cover plate 19. The inside of the cover plate 19 is fixed with a connecting seat 20 penetrating through the installation opening 18. The transmission gear 14 is rotatably arranged on the connecting seat 20. The outside of the valve plate shell 8 is provided with two symmetrical and inclined distribution clamping plates 21. The cover plate 19 is trapezoidal and clamped into the two clamping plates 21 from the side. The outside of the installation opening 18 is provided with a sealing embedding groove 22. A sealing rubber ring 23 is embedded in the sealing embedding groove 22, and the outside of the sealing rubber ring 23 abuts against the cover plate 19.

[0034] It should be noted that the sealing ring 23 can prevent the installation groove 9 from entering the fluid to erode the parts, and the cover plate 19 can be slid to the side and removed, and the transmission gear 14 can be moved to the side during installation to prevent it from interfering with the first rack 15 and the second rack 17. After the first rack 15 and the second rack 17 are installed in place, the cover plate 19 is slid to the side and fixed, and at this time the transmission gear 14 can be moved to the side between the first rack 15 and the second rack 17 and engaged with them. The installation is convenient, and similarly, during disassembly, the first rack 15 and the second rack 17 can be removed by first moving the transmission gear 14 to the side. The disassembly and assembly operation is simple.

[0035] As shown in Figure 5 , the side of the connecting seat 20 is fixed with a fixed shaft 24, the fixed shaft 24 is provided with a rotating groove 25, the transmission gear 14 is sleeved on the fixed shaft 24, and the side of the transmission gear 14 is fixed with two limit blocks 27 that are symmetrical to each other and extend inwardly. The inner side of the limit block 27 is located in the rotating groove 25, and the side of the rotating groove 25 is provided with two notched grooves 26 matched with the limit blocks 27.

[0036] It should be noted that when the transmission gear 14 is installed and disassembled, the limit blocks 27 are aligned with the notched grooves 26, so that the transmission gear 14 can be installed or disassembled. When the transmission gear 14 rotates, the limit blocks 27 will rotate along the rotating groove 25, and the rotation angle of the transmission gear 14 during normal operation does not exceed half a circle. After the transmission gear 14 is installed, the limit blocks 27 are separated from the notched grooves 26 by a certain angle to ensure the entire working process, and the limit blocks 27 and the notched grooves 26 will not overlap again. The installation is simple and stable.

[0037] As shown in Figure 2 , the outer side of the moving sleeve 10 is provided with an outer embedding groove, and the outer embedding groove is provided with an outer sealing ring 28. The outer side of the outer sealing ring 28 abuts against the inside of the installation groove 9. The inner side of the moving sleeve 10 is provided with an inner embedding groove, and the inner embedding groove is provided with an inner sealing ring 29. The inner side of the inner sealing ring 29 abuts against the outer wall of the moving block 12.

[0038] It should be noted that the outer sealing ring 28 and the inner sealing ring 29 improve the sealing performance of the inner and outer sides of the moving sleeve 10, prevent the fluid from entering the installation groove 9 to erode the parts, and prevent fluid leakage.

[0039] As shown in Figure 1 , Figure 2 , Figure 7 , and Figure 8As shown, the present application provides another technical solution: a soft sealing gate valve using the above multiple sealing valve plate structure, comprising a water inlet pipe 1, a water outlet pipe 2 and a bottom shell 3 connecting the water inlet pipe 1 and the water outlet pipe 2, the upper end of the bottom shell 3 is fixed with an upper shell 4, the middle of the upper shell 4 is rotatably provided with a sleeve 5, the upper end of the sleeve 5 is fixed with a rotating handle 6, the lower end of the sleeve 5 is threadedly connected with a threaded rod 7, the multiple sealing valve plate structure is fixed at the lower end of the threaded rod 7, and the installation groove 9 is towards the water inlet pipe 1, and the installation groove 9 is consistent with the inner diameter of the water inlet pipe 1.

[0040] It should be noted that rotating the rotating handle 6 can drive the sleeve 5 to rotate, and through the action of threaded connection, it can drive the threaded rod 7 to move up and down, when the two ends of the valve plate shell 8 respectively abut against the water inlet pipe 1 and the water outlet pipe 2, the valve closing effect can be realized, and when the valve is closed, the sealing rubber sleeve 11 will extend into the water inlet pipe 1 and remain at the connection position of the water inlet pipe 1 and the installation groove 9.

[0041] As shown in Figure 7 , the upper end of the upper shell 4 is provided with a widened groove 30 on the inner side, the outer side of the sleeve 5 is provided with a stop ring 31, the stop ring 31 is located inside the widened groove 30, a thrust bearing 32 is provided above the stop ring 31, the lower end of the stop ring 31 is sleeved with a fixed plate 33, a plurality of first installation holes 34 are arranged on the inner wall of the upper shell 4, a plurality of second installation holes 35 are arranged on the fixed plate 33, and the fixed plate 33 is fixed on the inner wall of the upper shell 4 by bolts.

[0042] It should be noted that when the gate is closed, the valve plate shell 8 will abut against the lower end of the bottom shell 3, and the bottom shell 3 will extrude the threaded rod 7 and the sleeve 5 upwards, at this time the stop ring 31 will abut against the thrust bearing 32, and under the condition of large pressure, the thrust bearing 32 can reduce the resistance when rotating the rotating handle 6.

[0043] As shown in Figure 8 and Figure 4 , the two sides of the valve plate shell 8 are provided with guide grooves 37, and the inner wall of the bottom shell 3 is fixed with guide ribs 36, and the guide grooves 37 are sleeved outside the corresponding guide ribs 36.

[0044] It should be noted that under the action of the guide ribs 36 and the guide grooves 37, the valve plate shell 8 is more stable during the rising and falling process, and will not rotate with the threaded rod 7, in addition, the guide ribs 36 can also improve the structural strength of the bottom shell 3.

[0045] As shown in Figure 2 , Figure 7 and Figure 8As shown, the lower end of the upper shell 4 is provided with a first connecting flange 38, the upper end of the bottom shell 3 is provided with a second connecting flange 39, and the first connecting flange 38 and the second connecting flange 39 are fixed by bolts, the outer side of the threaded rod 7 is sleeved with an elastic sealing cover 40, the outer edge of the elastic sealing cover 40 is fixed between the first connecting flange 38 and the second connecting flange 39, the bottom of the threaded rod 7 is threadedly connected with a compression ring 41, and the lower end of the compression ring 41 is clamped with the upper surface of the valve plate shell 8 on both sides of the inner edge of the elastic sealing cover 40.

[0046] It should be noted that during use of the gate valve, fluid enters the inside of the bottom shell 3, and the elastic sealing cover 40 can prevent the fluid from flowing out from the gap between the threaded rod 7 and the sleeve 5, and when the elastic sealing cover 40 is installed, the outer edge of the elastic sealing cover 40 is fixed by the first connecting flange 38 and the second connecting flange 39, and the inner edge of the elastic sealing cover 40 is fixed by the compression ring 41 and the valve plate shell 8, and the fixing method is simple and convenient to install.

[0047] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A multi-layer sealing valve plate structure, comprising a valve plate housing (8), characterized in that: The valve plate housing (8) is wedge-shaped. One end of the valve plate housing (8) is provided with an installation groove (9). The installation groove (9) faces the water inlet side of the gate valve. A movable sleeve (10) is slidably arranged inside the installation groove (9). A sealing sleeve (11) is connected to the side of the movable sleeve (10) facing the opening of the installation groove (9). The outer diameter of the sealing sleeve (11) is smaller than the inner diameter of the installation groove (9). A movable block (12) is slidably arranged inside the movable sleeve (10). The side cross-sectional area of ​​the movable block (12) is larger than the side cross-sectional area of ​​the movable sleeve (10). A compression spring (13) is provided inside the installation groove (9). The two ends of the compression spring (13) abut against the bottom of the groove of the movable block (12) and the installation groove (9) respectively. A reverse transmission mechanism is provided between the movable block (12) and the movable sleeve (10) to move the two in opposite directions.

2. The multi-sealed valve plate structure according to claim 1, characterized in that: The reverse transmission mechanism includes a transmission gear (14) rotatably disposed inside the mounting groove (9), a first rack (15) fixed on the moving block (12), and the first rack (15) meshing with the transmission gear (14), an extension rod (16) fixed on the moving sleeve (10), and a second rack (17) fixed on the extension rod (16), and the second rack (17) meshing with the transmission gear (14), with the first rack (15) and the second rack (17) distributed in parallel.

3. The multi-layer sealing valve plate structure according to claim 2, characterized in that: The valve plate housing (8) has an installation port (18) connected to the installation slot (9) on the side away from the installation slot (9). A cover plate (19) is provided on the outside of the installation port (18). A connecting seat (20) that passes through the installation port (18) is fixed on the inside of the cover plate (19). A transmission gear (14) is rotatably mounted on the connecting seat (20). Two symmetrical and inclined clamping plates (21) are provided on the outside of the valve plate housing (8). The cover plate (19) is trapezoidal and is inserted into the two clamping plates (21) from the side. A sealing embedding groove (22) is provided on the outside of the installation port (18). A sealing ring (23) is embedded in the sealing embedding groove (22), and the outside of the sealing ring (23) abuts against the cover plate (19).

4. The multi-layer sealing valve plate structure according to claim 3, characterized in that: The side of the connecting seat (20) is fixed with a fixed shaft (24), and a rotating groove (25) is provided on the fixed shaft (24). The transmission gear (14) is sleeved on the fixed shaft (24), and two mutually symmetrical and inwardly extending limiting blocks (27) are fixed on the side of the transmission gear (14). The inner side of the limiting block (27) is located in the rotating groove (25), and two notches (26) matching the limiting block (27) are provided on the side of the rotating groove (25).

5. The multi-sealed valve plate structure according to claim 1, characterized in that: The outer side of the movable sleeve (10) is provided with an outer embedding groove, and an outer sealing ring (28) is provided in the outer embedding groove. The outer side of the outer sealing ring (28) abuts against the inside of the mounting groove (9). The inner side of the movable sleeve (10) is provided with an inner embedding groove, and an inner sealing ring (29) is provided in the inner embedding groove. The inner side of the inner sealing ring (29) abuts against the outer wall of the movable block (12).

6. A soft-seal gate valve, using a multi-sealed valve plate structure as described in any one of claims 1-5, comprising an inlet pipe (1), an outlet pipe (2), and a bottom shell (3) connecting the inlet pipe (1) and the outlet pipe (2), characterized in that: The upper shell (4) is fixed to the upper end of the bottom shell (3). A sleeve (5) is rotatably installed in the middle of the upper shell (4). A rotating handle (6) is fixed to the upper end of the sleeve (5). A threaded rod (7) is threaded to the lower end of the sleeve (5). A multi-sealed valve plate structure is fixed to the lower end of the threaded rod (7). The mounting groove (9) faces the water inlet pipe (1), and the mounting groove (9) is consistent with the inner diameter of the water inlet pipe (1).

7. A soft-seal gate valve according to claim 6, characterized in that: The upper shell (4) has an expansion groove (30) on its inner side, and a retaining ring (31) is provided on the outer side of the sleeve (5). The retaining ring (31) is located inside the expansion groove (30), and a thrust bearing (32) is provided above the retaining ring (31). A fixing plate (33) is fitted on the lower end of the retaining ring (31). The upper shell (4) has several circumferentially distributed first mounting holes (34), and the fixing plate (33) has several circumferentially distributed second mounting holes (35). The fixing plate (33) is fixed to the inner wall of the upper shell (4) by bolts.

8. A soft-seal gate valve according to claim 6, characterized in that: The valve plate outer shell (8) has guide grooves (37) on both sides, and guide ribs (36) are fixed on the inner wall of the bottom shell (3), and the guide grooves (37) are sleeved on the outside of the guide ribs (36) at the corresponding positions.

9. A soft-seal gate valve according to claim 6, characterized in that: The lower end of the upper shell (4) is provided with a first connecting flange (38), and the upper end of the bottom shell (3) is provided with a second connecting flange (39). The first connecting flange (38) and the second connecting flange (39) are fixed together by bolts. An elastic sealing cover (40) is sleeved on the outside of the threaded rod (7). The outer edge of the elastic sealing cover (40) is fixed between the first connecting flange (38) and the second connecting flange (39). The bottom of the threaded rod (7) is threaded with a clamping ring (41), and the lower end of the clamping ring (41) is clamped to the upper surface of the valve plate shell (8) on both sides of the inner edge of the elastic sealing cover (40).

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