Pilot-operated gate valve

Abstract

The utility model relates to the field of valves, and particularly discloses a pilot-operated gate valve which comprises a main valve, a valve rod is rotatably connected in the main valve, a valve plate is slidably connected in the main valve, and a pilot-operated valve is connected below the main valve. The pilot valve comprises a valve body, the upper end of the valve body is fixedly connected with connecting pipes, the connecting pipes are communicated with the interior of the main valve, and the connecting pipes are located on the two sides of the valve plate. By designing the pilot valve, fluid on one side of the valve body can be conveyed to the other side of the valve body when the internal pressure of the valve body reaches customization, the pressure difference of the two sides is reduced, the friction force generated when the valve plate ascends is reduced, and the valve plate can be conveniently opened. By designing the plate spring and the sealing blocks, when the spring needs to be detached and replaced, the valve plate continues to move downwards, so that the plate spring can be driven to deform to push the sealing blocks on the two sides to seal the connecting pipe, the valve body can be opened to replace the spring, and the service life of the pilot valve is prolonged.

Description

A pilot-operated gate valve Technical Field

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

[0002] A gate valve is a valve that opens by lifting a barrier outside the fluid path. Gate valves require very little space along the pipe axis and hardly restrict fluid flow when the gate is fully open, resulting in very low flow resistance. The gate face can be parallel, but the most common type is the wedge gate valve. Gate valves can only be fully open or fully closed and cannot be used for regulation or throttling.

[0003] In existing technology, the gate of a gate valve moves perpendicular to the fluid direction. Movement of the gate is primarily achieved by rotating a screw at the upper end of the valve. This screw, connected to a threaded hole, moves the gate up and down, opening and closing the valve. However, when the liquid pressure in the connected pipeline is high, the liquid exerts a significant force on the side of the gate, increasing friction and requiring a large force to open. Therefore, those skilled in the art have provided a pilot-operated gate valve to address the problems mentioned in the background. Summary of the Invention

[0004] To solve the above technical problems, this utility model provides a pilot-operated gate valve, including a main valve, a valve stem rotatably connected inside the main valve, a valve plate slidably connected inside the main valve, and a pilot valve connected below the main valve.

[0005] The pilot valve includes a valve body, with a connecting pipe fixedly connected to the upper end of the valve body. The connecting pipe communicates with the interior of the main valve and is located on both sides of the valve plate. A valve seat is fixedly connected to one end of the connecting pipe, and a valve core is provided at one end of the valve seat inside the connecting pipe. Sealing caps are threaded to both ends of the connecting pipe, and an adjusting screw is threaded to the interior of one end of the sealing cap. A spring is provided between one end of the adjusting screw and the valve core. A leaf spring is slidably connected to the interior of the main valve below the valve plate. Magnetic blocks are fixedly connected to both ends of the leaf spring. Sealing blocks are slidably connected to both sides of the lower end of the main valve. One end of the sealing block is inserted into the interior of the connecting pipe, and the other end of the sealing block is in contact with the magnetic block.

[0006] Preferably, the main valve has an inlet on one side and an outlet on the other side, with the outlet located at the end of the main valve near the adjusting screw.

[0007] Preferably, the valve seat has a through hole inside, one end of which is a conical surface, and one end of the valve core is inserted into the valve seat and the other end fits against the valve seat.

[0008] Preferably, the cross-sectional area of ​​the valve plate is larger than the area of ​​the internal through hole of the main valve.

[0009] Preferably, a movable block is fitted onto the valve stem, and the movable block is engaged with the upper end of the valve plate.

[0010] Preferably, a handwheel is fixedly connected to the upper end of the valve stem.

[0011] Preferably, a handwheel is fixedly connected to one end of the adjusting screw.

[0012] Preferably, the sealing block is fitted to the inner wall of the connecting pipe.

[0013] The technical effects and advantages of this utility model are as follows:

[0014] 1. This utility model is designed with a pilot valve that can transport fluid from one side of the valve body to the other side when the internal pressure of the valve body reaches a certain level, thereby reducing the pressure difference between the two sides, reducing the friction when the valve plate rises, and making it easier to open the valve plate.

[0015] 2. This utility model is designed with a leaf spring and sealing blocks. When it is necessary to disassemble and replace the spring, the valve plate continues to move down, thereby driving the leaf spring to deform and push the sealing blocks on both sides to close the connecting pipe. This allows the valve body to be opened to replace the spring, thus improving the service life of the pilot valve. Attached Figure Description

[0016] Figure 1 is a schematic diagram of the structure provided in this application;

[0017] Figure 2 is a schematic diagram of the internal structure of the valve body provided in this application;

[0018] Figure 3 is a schematic diagram of the structure of A in Figure 2 provided in this application;

[0019] In the picture:

[0020] 1. Main valve; 2. Valve stem; 21. Moving block; 3. Inlet; 4. Outlet;

[0021] 5. Pilot valve; 51. Valve body; 52. Connecting pipe; 53. Valve seat; 54. Valve core; 55. Adjusting screw; 56. Sealing cap; 57. Spring; 58. Sealing block; 59. Magnetic block; 510. Leaf spring;

[0022] 6. Valve plate. Detailed Implementation

[0023] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Please refer to Figures 1-3. In this embodiment, a pilot-operated gate valve is provided, including a main valve 1, a valve stem 2 rotatably connected inside the main valve 1, a valve plate 6 slidably connected inside the main valve 1, and a pilot valve 5 connected below the main valve 1.

[0027] The pilot valve 5 includes a valve body 51. A connecting pipe 52 is fixedly connected to the upper end of the valve body 51. The connecting pipe 52 communicates with the inside of the main valve 1. The connecting pipe 52 is located on both sides of the valve plate 6. A valve seat 53 is fixedly connected to one end of the connecting pipe 52. A valve core 54 is provided at one end of the valve seat 53 inside the connecting pipe 52. Sealing caps 56 are threaded to both ends of the connecting pipe 52. An adjusting screw 55 is threaded to the inside of one end of the sealing cap 56. A spring 57 is provided between one end of the adjusting screw 55 and the valve core 54. A leaf spring 510 is slidably connected to the inside of the main valve 1 below the valve plate 6. Magnetic blocks 59 are fixedly connected to both ends of the leaf spring 510. Sealing blocks 58 are slidably connected to both sides of the lower end of the main valve 1. One end of the sealing block 58 is inserted into the inside of the connecting pipe 52, and the other end of the sealing block 58 is in contact with the magnetic block 59.

[0028] When in use, the gate valve is connected to the pipeline. The valve plate 6 is moved up and down by rotating the valve stem 2. When the pressure in the pipeline reaches the predetermined pressure, the fluid enters one side of the valve seat 53 through the connecting pipe 52. The fluid passes through the valve seat 53 and pushes the valve core 54 to move. After the valve core 54 is pushed open, it flows into the other side of the valve plate 6 through another connecting pipe 52, thereby reducing the pressure difference on both sides of the valve plate 6, making the valve plate 6 easier to open and close.

[0029] When the spring 57 inside the connecting pipe 52 fails and needs replacement, the valve plate 6 continues to descend while the main valve 1 is closed, controlled by the valve stem 2. The descent of the valve plate 6 causes the leaf spring 510 to deform, which in turn pushes the magnetic blocks 59 on both sides to move to the sides. The magnetic blocks 59 then push the sealing block 58 to move, sealing the connecting pipe 52 and preventing fluid from the main valve 1 from flowing out of the connecting pipe 52 during replacement. The user then opens the sealing cap 56 and removes the spring 57 for replacement. The magnetic blocks 59 act as magnets, thus attracting the sealing block 58 to return to its original position when the leaf spring 510 resets.

[0030] In this embodiment, specifically, the main valve 1 has an inlet 3 on one side and an outlet 4 on the other side, with the outlet 4 located at the end of the main valve 1 near the adjusting screw 55. Fluid flows in through the inlet 3 and is discharged through the outlet 4.

[0031] In this embodiment, specifically, the valve seat 53 has a through hole inside, one end of which is a conical surface. One end of the valve core 54 is inserted into the valve seat 53 and the other end fits against the valve seat 53. By inserting one end of the valve core 54 into the valve seat 53, the valve seat 53 is blocked, so that fluid needs to be pushed to move the valve core 54 before it can pass through the valve seat 53.

[0032] In this embodiment, specifically, the cross-sectional area of ​​the valve plate 6 is larger than the area of ​​the internal through hole of the main valve 1. When sealing the interior of the main valve 1, the valve plate 6 can continue to descend a certain distance.

[0033] In this embodiment, specifically, a movable block 21 is sleeved on the valve stem 2, and the movable block 21 is engaged with the upper end of the valve plate 6. The valve stem 2 rotates to drive the movable block 21 to move up and down, which in turn drives the valve plate 6 to move up and down, thereby controlling the opening and closing of the main valve 1.

[0034] In this embodiment, a handwheel is fixedly connected to the upper end of the valve stem 2. The handwheel drives the valve stem 2 to rotate, which in turn drives the moving block 21 to move up and down.

[0035] In this embodiment, specifically, a handwheel is fixedly connected to one end of the adjusting screw 55. The preset pressure is adjusted by rotating the handwheel and adjusting the adjusting screw 55.

[0036] In this embodiment, specifically, the sealing block 58 is fitted against the inner wall of the connecting pipe 52. The connecting pipe 52 is sealed by the sealing block 58.

[0037] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A pilot-operated gate valve, comprising a main valve (1), characterized in that, The main valve (1) is rotatably connected to a valve stem (2), and a valve plate (6) is slidably connected inside the main valve (1). A pilot valve (5) is connected below the main valve (1). The pilot valve (5) includes a valve body (51), and a connecting pipe (52) is fixedly connected to the upper end of the valve body (51). The connecting pipe (52) communicates with the inside of the main valve (1). The connecting pipe (52) is located on both sides of the valve plate (6). A valve seat (53) is fixedly connected to one end of the connecting pipe (52). A valve core (54) is provided at one end of the connecting pipe (52) located at the valve seat (53). The two ends are threaded with sealing caps (56). One end of the sealing cap (56) is threaded with an adjusting screw (55). One end of the adjusting screw (55) is connected to the valve core (54) with a spring (57). The main valve (1) is slidably connected to a leaf spring (510) located below the valve plate (6). The two ends of the leaf spring (510) are fixedly connected with magnetic blocks (59). The two sides of the lower end of the main valve (1) are slidably connected with sealing blocks (58). One end of the sealing block (58) is inserted into the connecting pipe (52), and the other end of the sealing block (58) is in contact with the magnetic block (59).

2. The pilot-operated gate valve according to claim 1, characterized in that, The main valve (1) has an inlet (3) on one side and an outlet (4) on the other side. The outlet (4) is located at the end of the main valve (1) near the adjusting screw (55).

3. A pilot-operated gate valve according to claim 1, characterized in that, The valve seat (53) has a through hole inside, one end of which is a conical surface. One end of the valve core (54) is inserted into the valve seat (53), and the other end is in contact with the valve seat (53).

4. A pilot-operated gate valve according to claim 1, characterized in that, The cross-sectional area of ​​the valve plate (6) is greater than the area of ​​the internal through hole of the main valve (1).

5. A pilot-operated gate valve according to claim 1, characterized in that, A movable block (21) is fitted on the valve stem (2), and the movable block (21) is inserted into the upper end of the valve plate (6).

6. A pilot-operated gate valve according to claim 1, characterized in that, A handwheel is fixedly connected to the upper end of the valve stem (2).

7. A pilot-operated gate valve according to claim 1, characterized in that, A handwheel is fixedly connected to one end of the adjusting screw (55).

8. A pilot-operated gate valve according to claim 1, characterized in that, The sealing block (58) is attached to the inner wall of the connecting pipe (52).

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