Bidirectional sealing double-gate-plate gate valve

Abstract

The utility model discloses a two-way sealing double-disc gate valve which comprises a valve body and a valve rod located in the valve body, one end of the valve rod is connected with a valve rod head, one end of the valve rod head is connected with a wedge-shaped block, T-shaped grooves are formed in the two sides of the wedge-shaped block, the wedge-shaped block is connected with a sealing disc through the T-shaped grooves, and the sealing disc is connected with the valve rod head. A T-shaped head located in the T-shaped groove is fixedly connected to the side, facing the wedge-shaped block, of the sealing disc, a separation spring and a guide rod are arranged in the T-shaped head, the valve is opened in a two-section mode, the sealing face of the sealing disc of the valve and the sealing face of the valve seat are separated firstly and then opened, and a bottom cover is fixedly connected to the lower side of the wedge-shaped block. The valve has the advantages that a valve DBB structure is adopted, the sealing performance of a two-way inlet and the discharging function of a valve cavity are achieved, and a two-way pressure source can be cut off at the same time.

Description

Technical Field

[0001] This utility model relates to the field of gate valves, specifically a bidirectional sealing double-gate valve. Background Technology

[0002] Because of the excellent sealing performance of the parallel double-gate valve on both the inlet and outlet sides, the medium entering the valve cavity is sealed within it. Under the influence of external heat, the temperature of the medium inside the cavity rises, and the medium sealed within the cavity gradually changes from a cold state to a hot state, with liquids potentially vaporizing. The gas expands rapidly, but since the volume of the cavity cannot increase, the pressure inside the valve cavity rises sharply, causing the pressure to be several times higher than the nominal pressure. This can range from affecting the normal opening of the valve to, in severe cases, damaging the valve's pressure-bearing components, opening components, and actuators.

[0003] However, the current parallel double-gate valve structure has the following drawbacks:

[0004] 1. Structural composition: The internal components consist of five parts: two sealing discs, two expansion blocks, and a wedge block. The structure is loose.

[0005] 2. Applicable diameter range: When used in small-diameter valves, it is difficult to guarantee the machining accuracy of parts, resulting in unstable sealing performance;

[0006] 3. Function: The sealing disc does not retract when the valve is opened, which can easily damage the valve sealing surface and cause the valve seal to fail. Utility Model Content

[0007] The purpose of this utility model is to provide a bidirectional sealing double gate valve to solve the problems mentioned in the background art. It has the advantages of more efficient force transmission between components and better valve sealing effect.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a bidirectional sealing double gate valve, comprising a valve body, a drain hole at the bottom of the valve body, and a valve stem inside the valve body. One end of the valve stem is connected to a valve stem head, and one end of the valve stem head is connected to a wedge block. T-grooves are provided on both sides of the wedge block. A sealing disc is connected to the wedge block through the T-grooves. A T-shaped head is fixedly connected to the side of the sealing disc facing the wedge block, which is located in the T-groove. A bottom cover is fixedly connected to the lower side of the wedge block.

[0009] By adopting the above technical solution, when the valve is opened, the valve stem connected to the valve stem head drives the wedge block to move upward. Under the action of the T-groove and the inclined surface of the T-head, the sealing disc retracts towards the center of the valve, separating the sealing disc from the sealing surface of the valve body. When the bottom of the T-head contacts the bottom cover, the sealing disc retracts towards the center and opens with the upward movement of the wedge block until the valve is fully open. During the upward movement and opening process of the sealing disc, the sealing disc and the sealing surface of the valve body never come into contact, so there is no friction.

[0010] When the valve is closed: the valve stem moves the wedge block downwards, and the sealing disc moves vertically downwards under the compression force of the separation spring. After the vertical movement is in place, the wedge block continues to move downwards, and the sealing disc is pushed horizontally towards the valve passage by the T-groove and the inclined surface of the T-head until the sealing disc contacts the valve body sealing surface. The sealing disc and the valve body sealing surface are then engaged, and the valve is fully closed.

[0011] As a further embodiment of this utility model: a valve cover is provided on the upper side of the valve body, a bracket is also provided on the upper side of the valve cover, an electric actuator is provided on one side of the bracket, and a handwheel is provided on one side of the electric actuator.

[0012] By adopting the above technical solution, when the valve is opened: the electric actuator is started, or the handwheel is rotated counterclockwise to achieve the purpose of moving the valve stem upward;

[0013] When the valve is closed: start the electric actuator or rotate the handwheel clockwise to move the valve stem downward.

[0014] As a further embodiment of this utility model: a packing body is provided circumferentially on the valve stem, a packing gland is provided above the packing body, a compensating disc spring is provided on the upper side of the packing gland, and the compensating disc spring is located between the bracket and the packing gland.

[0015] By adopting the above technical solution, the packing gland prevents the valve stem from being affected by radial force, ensuring that the valve stem can overcome the displacement caused by the medium force during the gate closing process. Four compensating disc springs are set on the upper side of the packing gland to compensate for the pressure of the packing and ensure that the seal is maintained even after the packing wears.

[0016] Preferably, a pressure ring is provided on one side of each of the two sealing discs, and a sealing ring is provided on one side of each sealing disc.

[0017] As a further embodiment of this utility model: an mounting plate is installed on the upper side of the wedge block, and two guide rods are fixedly connected to the side of the mounting plate facing the wedge block, and two separation springs are sleeved on the two guide rods.

[0018] By adopting the above technical solution, when closing, the spring pushes the sealing disc downward. After it reaches the position, the wedge block continues to move downward, the spring is compressed, and the sealing disc moves horizontally until the valve is closed. When opening, the wedge block moves upward, the sealing disc moves horizontally and converges towards the center of the valve. When the bottom cover of the wedge block contacts the lower end of the gate plate, the gate plate moves upward with the wedge block to open the valve.

[0019] As a further improvement of this utility model, a guide sleeve is provided below the packing gland.

[0020] By adopting the above technical solution, the guide sleeve further ensures that the valve stem is no longer affected by radial force, guaranteeing that the valve stem can deflect under the action of medium force during the gate closing process.

[0021] As a further improvement of this utility model: a U-shaped groove is provided in the middle of the sealing surface of the sealing ring, and a crescent groove is provided on the back of the sealing ring.

[0022] By adopting the above technical solution, a liquid sealing band is added to the sealing surface after the medium enters the U-shaped groove, which further improves the sealing performance of the valve. A crescent groove is set on the back of the sealing ring to accommodate the deformation of the sealing ring when closed, thus extending the service life of the sealing ring. The sealing ring is made of PTFE material.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] 1. The components are an integral structure, which makes the force transmission between them more efficient and the valve sealing effect better;

[0025] 2. It has a bidirectional sealing function. Due to the excellent sealing performance of the DBB structure at both inlets, the pressure medium on both sides of the valve will not enter the valve cavity when the valve is closed. The cavity is equipped with a drain hole, so the cavity can be emptied when the valve is closed. The cavity does not retain medium and will not be affected by external heat to cause pressure buildup. It also has an emergency shut-off function.

[0026] 3. It fundamentally changes the structure of the previous parallel double gate valve. This valve is a two-stage opening and closing double gate valve. The valve opening and closing sealing surface has zero friction, which reduces the wear of the sealing surface, effectively improves the service life of the valve, reduces the valve opening and closing force, and reduces the configuration of the actuator.

[0027] 4. When the valve is opened, the valve stem drives the wedge block to move upward. Under the action of the inclined surfaces of the T-groove and T-head, the sealing disc retracts towards the center of the valve, separating the sealing disc from the sealing surface of the valve body. When the bottom of the T-head contacts the bottom cover, the sealing disc retracts towards the center and opens with the upward movement of the wedge block until the valve is fully open. During the upward movement and opening process of the sealing disc, the sealing disc and the sealing surface of the valve body never come into contact, so there is no friction.

[0028] 5. The T-shaped head is equipped with a separation spring and a guide rod, which enables the valve to open in two stages, allowing the valve sealing disc sealing surface to separate from the valve seat sealing surface before opening. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of an embodiment;

[0030] Figure 2 This is a cross-sectional view of an embodiment;

[0031] Figure 3This is an exploded view diagram of an embodiment;

[0032] Figure 4 for Figure 3 An exploded view of the middle section of the structure.

[0033] In the diagram: 1. Handwheel; 2. Electric actuator; 3. Bracket; 4. Valve stem; 5. Compensating disc spring; 6. Packing gland; 7. Guide sleeve; 8. Packing body; 9. Valve cover; 10. Valve stem head; 11. Guide rod; 12. Release spring; 13. Wedge block; 14. T-slot; 15. Drain hole; 16. Valve body; 17. Gasket; 18. Bottom cover; 19. T-head; 20. Connector; 21. Sealing disc; 22. Sealing ring; 23. Pressure ring. Detailed Implementation

[0034] The technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments 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 are within the protection scope of this utility model.

[0035] In this embodiment of the utility model,

[0036] A bidirectional sealing double-gate valve, such as Figures 1-4 As shown, the valve includes a valve body 16, a drain hole 15 at the bottom of the valve body 16, and a valve stem 4 inside the valve body 16. One end of the valve stem 4 is connected to a valve stem head 10, and the other end of the valve stem head is connected to a wedge block 13. T-grooves 14 are provided on both sides of the wedge block 13. A sealing disc 21 is connected to the wedge block 13 through the T-grooves 14. A T-shaped head 19 is fixedly connected to the side of the sealing disc 21 facing the wedge block 13, which is located in the T-grooves 14. A bottom cover 18 is fixedly connected to the lower side of the wedge block 13.

[0037] A latch 20 is provided on one side of the sealing disc 21, and the T-shaped head 19 is provided on the latch 20.

[0038] A valve cover 9 is installed on the top of the valve body 16, and a gasket 17 is provided between the valve cover 9 and the valve body 16.

[0039] A bracket 3 is also provided on the upper side of the valve body 16, an electric actuator 2 is provided on one side of the bracket 3, and a handwheel 1 is provided on one side of the electric actuator 2.

[0040] The valve stem 4 is provided with a packing body 8 around its circumference. A packing gland 6 is provided above the packing body 8. Four sets of compensating disc springs 5 ​​are provided on the upper side of the packing gland 6. The four sets of compensating disc springs 5 ​​are located between the bracket 3 and the packing gland 6.

[0041] Each of the two sealing discs 21 is provided with a pressure ring 23 on one side, and a sealing ring 22 is provided on one side of the sealing disc 21.

[0042] A valve stem head 10 is installed on the upper side of the wedge block 13. Two guide rods 11 are fixedly connected to the side of the valve stem head 10 facing the wedge block 13. Two release springs 12 are respectively sleeved on the two guide rods 11.

[0043] A guide sleeve 7 is provided below the packing gland 6.

[0044] The sealing surface of the sealing ring 22 has a U-shaped groove in the middle, and the back of the sealing ring 22 has a crescent groove.

[0045] Working principle:

[0046] When the valve is opened: start the electric actuator 2, or rotate the handwheel 1 counterclockwise. The valve stem 4 drives the wedge block 13 to move upward. Under the action of the inclined surfaces of the T-groove 14 and the T-head 19, the sealing disc 21 retracts towards the center of the valve, causing the sealing disc 21 and the sealing ring 22 to separate from the sealing surface of the valve body 16. When the bottom of the T-head 19 contacts the bottom cover 18, the sealing disc 21 retracts towards the center and opens with the upward movement of the wedge block 13 until the valve is fully open. During the upward movement of the sealing disc 21, the sealing disc 21 and the sealing ring 22 never come into contact with the sealing surface of the valve body 16, so there is no friction.

[0047] When the valve is closed: Start the electric actuator 2, or rotate the handwheel 1 clockwise. The valve stem 4 drives the wedge block 13 to move downward. Under the compression force of the separation spring 12, the sealing disc 21 moves vertically downward. After it moves vertically into place, the wedge block 13 continues to move downward. Under the action of the T-groove 14 and the inclined surface of the T-head 19, the sealing disc 21 and the sealing ring 22 are pushed horizontally towards the valve passage until the sealing disc 21 and the sealing ring 22 come into contact with the sealing surface of the valve body 16. The sealing disc 21 and the sealing ring 22 are engaged with the sealing surface of the valve body 16, and the valve is fully closed.

[0048] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A bidirectional sealing double-gate valve, comprising a valve body (16), a drain hole (15) disposed at the bottom of the valve body (16), and a valve stem (4) disposed within the valve body (16), characterized in that: One end of the valve stem (4) is connected to a valve stem head (10), and one end of the valve stem head is connected to a wedge block (13). T-grooves (14) are provided on both sides of the wedge block (13). A sealing disc (21) is connected to the wedge block (13) through the T-grooves (14). A T-head (19) is fixedly connected to the side of the sealing disc (21) facing the wedge block (13) and located in the T-grooves (14). A bottom cover (18) is fixedly connected to the lower side of the wedge block (13).

2. The bidirectional sealing double-gate valve according to claim 1, characterized in that: A valve cover (9) is provided on the upper side of the valve body (16), and a bracket (3) is also provided on the upper side of the valve cover (9). An electric actuator (2) is provided on one side of the bracket (3), and a handwheel (1) is provided on one side of the electric actuator (2).

3. The bidirectional sealing double-gate valve according to claim 1, characterized in that: The valve stem (4) is provided with a packing body (8) around its circumference. A packing gland (6) is provided above the packing body (8). Four sets of compensating disc springs (5) are provided on the upper side of the packing gland (6). The four sets of compensating disc springs (5) are located between the bracket (3) and the packing gland (6).

4. The bidirectional sealing double-gate valve according to claim 1, characterized in that: A pressure ring (23) is provided on one side of the sealing disc (21), and a sealing ring (22) is provided on one side of the sealing disc (21).

5. The bidirectional sealing double-gate valve according to claim 1, characterized in that: A valve stem head (10) is installed on the upper side of the wedge block (13). Two guide rods (11) are fixedly connected to the side of the valve stem head (10) facing the wedge block (13). Two separation springs (12) are sleeved on the two guide rods (11).

6. The bidirectional sealing double-gate valve according to claim 1, characterized in that: A guide sleeve (7) is provided below the packing gland (6).

7. The bidirectional sealing double-gate valve according to claim 4, characterized in that: The sealing surface of the sealing ring (22) is provided with a U-shaped groove in the middle, and the back of the sealing ring (22) is provided with a crescent groove.

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