Leak-proof gate valve

Abstract

The utility model provides a kind of anti-leakage gate valve, belong to valve technical field.It solves the problem that the stem of traditional gate valve and valve body junction usually adopt single-stage packing seal structure, high-pressure medium is easy to penetrate along the outer wall of stem in long-term use process, exacerbate the risk of leakage problem.This anti-leakage gate valve, including valve body, valve seat and the water inlet, water outlet being arranged in the left and right ends of valve body, valve seat is installed in the top of valve body, the central position of valve seat top is provided with the through hole of the space inside valve body, valve stem is installed in through hole, the top of valve stem is installed with hand wheel for controlling valve stem, inner thread is provided on the inner wall of through hole, outer thread that cooperates with inner thread is provided on the outer wall of valve stem, sealing gasket for sealing is installed on the bottom of outer thread on valve stem.The utility model has the advantage of preventing valve body leakage.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and specifically relates to a leak-proof gate valve. Background Technology

[0002] A gate valve is a gate that opens and closes. The direction of the gate's movement is perpendicular to the direction of the fluid flow. Gate valves can only be fully open or fully closed, and cannot be used for regulation or throttling.

[0003] Traditional gate valves typically use a single-stage packing seal at the connection between the valve stem and the valve body. During long-term use, high-pressure media can easily seep along the outer wall of the valve stem, increasing the risk of leakage. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a leak-proof gate valve.

[0005] The purpose of this utility model can be achieved through the following technical solution: A leak-proof gate valve includes a valve body, a valve seat, and an inlet and an outlet located at the left and right ends of the valve body. The valve seat is installed on the top of the valve body, and a central hole communicating with the internal space of the valve body is opened at the center of the top of the valve seat. A valve stem is installed in the central hole, and a handwheel for controlling the valve stem is installed on the top of the valve stem. The valve stem is characterized in that an internal thread is provided on the inner wall of the central hole, and an external thread that mates with the internal thread is provided on the outer wall of the valve stem. A sealing gasket for sealing is installed on the valve stem at the bottom of the external thread, and the edge of the sealing gasket abuts against the inner wall of the valve body. The valve stem is provided with several layers of barbed snap rings, and a positioning ring with a groove is provided on the bottom of the snap rings. An annular groove for the snap rings to be inserted is opened on the side of the sealing gasket, and a positioning groove for the positioning rings to be inserted is opened on the inner wall of the sealing gasket.

[0006] In the aforementioned anti-leakage gate valve, a fixed seat with a water passage hole is provided in the valve body, and a valve disc for blocking the water passage hole of the fixed seat is connected to the bottom of the valve stem.

[0007] In the aforementioned anti-leakage gate valve, the valve seat is provided with an exhaust hole for venting, and the exhaust hole is connected to an internal thread.

[0008] In the aforementioned leak-proof gate valve, the sealing gasket is made of an elastic material.

[0009] In the aforementioned leak-proof gate valve, the sealing gasket is designed to be circular.

[0010] Compared with existing technologies, this anti-leakage gate valve adopts a combination design of "positioning ring + multi-layer barbed snap ring" to ensure the reliability and synchronization of power transmission between the valve stem and the elastic sealing gasket; the better the sealing effect, the more it eliminates the leakage path of the medium along the valve stem direction and reduces the leakage of the medium. Attached Figure Description

[0011] Figure 1 This is a 3D view of the anti-leakage gate valve.

[0012] Figure 2 This is a cross-sectional view of the anti-leakage gate valve.

[0013] Figure 3 This is a partial sectional view of the anti-leakage gate valve.

[0014] In the diagram, 1 is the valve body; 2 is the valve seat; 3 is the valve stem; 4 is the handwheel; 5 is the sealing gasket; 6 is the snap ring; 7 is the positioning ring; 8 is the annular groove; 9 is the positioning groove; 10 is the fixed seat; 11 is the valve disc; and 12 is the vent. Detailed Implementation

[0015] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0016] like Figure 1 , Figure 2 , Figure 3 As shown, this anti-leakage gate valve includes a valve body 1, a valve seat 2, and inlet and outlet ports located at the left and right ends of the valve body 1. The valve seat 2 is installed on the top of the valve body 1. A central hole communicating with the internal space of the valve body 1 is opened at the center of the top of the valve seat 2. A valve stem 3 is installed in the central hole, and a handwheel 4 for controlling the valve stem 3 is installed on the top of the valve stem 3. An internal thread is provided on the inner wall of the central hole, and an external thread that mates with the internal thread is provided on the outer wall of the valve stem 3. The mating of the internal and external threads allows for more stable longitudinal movement of the valve stem 3. A sealing gasket 5 is installed on the valve stem 3 at the bottom of the external thread, and the edge of the sealing gasket 5 abuts against... The sealing gasket 5, resting against the inner wall of the valve body 1, completely blocks the upper part of the valve body 1 to prevent water from flowing out from the gap in the valve stem 3 when water flows through. The valve stem 3 is provided with several layers of barbed snap rings 6. The valve stem 3 is provided with a grooved positioning ring 7 at the bottom of the snap rings 6. The side of the sealing gasket 5 is provided with an annular groove 8 for the snap rings 6 to be inserted. The barbed snap rings 6 are embedded layer by layer and firmly into the annular groove 8 on the side of the sealing gasket 5. The inner wall of the sealing gasket 5 is provided with a positioning groove 9 for the positioning ring 7 to be inserted. The positioning ring 7 is embedded in the positioning groove 9 on the inner wall of the sealing gasket 5, realizing the circumferential positioning and synchronous rotation of the two.

[0017] To elaborate further, the valve body 1 is provided with a fixed seat 10 with a water passage hole, and the bottom of the valve stem 3 is connected to a valve disc 11 for blocking the water passage hole of the fixed seat 10. When the valve body 1 is closed, the valve disc 11 blocks the water passage hole to prevent water from flowing through. When the valve stem 3 moves upward, the valve disc 11 moves upward to open the water passage hole and allow water to flow through.

[0018] To elaborate further, the valve seat 2 is provided with an exhaust port 12 for venting, and the exhaust port 12 is connected to the internal thread. The exhaust port 12 can ensure that the pressure in the threaded pair area is balanced with the atmospheric pressure, prevent the smoothness of operation from being affected by pressure accumulation or vacuum, and at the same time, it can also promptly discharge any trace amounts of leakage media that may pass through the thread gap, thus improving safety.

[0019] To elaborate further, the sealing gasket 5 is made of an elastic material.

[0020] To elaborate further, the sealing gasket 5 has a circular shape.

[0021] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0022] Although this document frequently uses terms such as valve body 1, valve seat 2, valve stem 3, handwheel 4, sealing gasket 5, snap ring 6, positioning ring 7, annular groove 8, positioning groove 9, fixing seat 10, valve disc 11, and vent hole 12, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A leak-proof gate valve, comprising a valve body (1), a valve seat (2), and an inlet and an outlet located at the left and right ends of the valve body (1), wherein the valve seat (2) is installed on the top of the valve body (1), and a central hole communicating with the internal space of the valve body (1) is provided at the center of the top of the valve seat (2), a valve stem (3) is installed in the central hole, and a handwheel (4) for controlling the valve stem (3) is installed on the top of the valve stem (3), characterized in that, The inner wall of the central hole is provided with an internal thread, and the outer wall of the valve stem (3) is provided with an external thread that mates with the internal thread. A sealing gasket (5) for sealing is installed on the valve stem (3) at the bottom of the external thread, and the edge of the sealing gasket (5) abuts against the inner wall of the valve body (1). Several layers of barbed snap rings (6) are provided on the valve stem (3). A positioning ring (7) with a groove is provided at the bottom of the snap ring (6) on the valve stem (3). An annular slot (8) for the snap ring (6) to be inserted is provided on the side of the sealing gasket (5). A positioning groove (9) for the positioning ring (7) to be inserted is provided on the inner wall of the sealing gasket (5).

2. The anti-leakage gate valve according to claim 1, characterized in that, The valve body (1) is provided with a fixed seat (10) with a water passage hole, and the bottom of the valve stem (3) is connected to a valve disc (11) for blocking the water passage hole of the fixed seat (10).

3. The anti-leakage gate valve according to claim 1, characterized in that, The valve seat (2) is provided with an exhaust hole (12) for venting, and the exhaust hole (12) is connected to an internal thread.

4. A leak-proof gate valve according to claim 1, characterized in that, The sealing gasket (5) is made of an elastic material.

5. A leak-proof gate valve according to claim 1, characterized in that, The sealing gasket (5) is designed in a circular shape.

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