A new type of stop valve

Abstract

The utility model relates to the technical field of stop valve, especially a new type of stop valve, including valve body, body cover bolt and valve cover, the valve cover swing joint is in the top of valve body, the body cover bolt is connected in the inside of valve body and valve cover with screw thread, the inboard rotation of valve body is connected with valve rod, the top of valve rod installs the nut with screw thread, the inboard screw of nut installs hand wheel. The new type of stop valve, when the valve is closed, because still have medium by the two small holes drain hole on the valve rod flow, the closing force of valve is not required very big, after the valve is closed, the small hole of bottom is just gradually closed by pilot valve, just because of this, the closing force of valve is much smaller than traditional stop valve, so the service life of new type of stop valve is long.

Description

Technical Field

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

[0002] In industrial applications, various valves are typically used to control pipelines. Among them, the gate valve is a type of valve used to quickly control the flow and interruption of liquids. The gate valve achieves the effect of stopping the flow of liquids by setting a cut-off structure between the inlet and outlet.

[0003] For example, the authorization announcement number "CN114811078B" describes a type of gate valve. Through a transmission connection structure that can surround the valve stem of the gate plug, the valve stem is prevented from being corroded by being placed in the gate function cavity for a long time. In existing traditional gate valves, when the medium pressure is high, if the valve disc is to be closed tightly, the force transmitted to the valve disc by rotating the handwheel to resist the force transmitted to the valve disc by the medium will be very large. This will not only cause slight deformation of the valve seat and valve disc, but also damage the valve stem thread, thus causing the valve to fail to seal. Utility Model Content

[0004] The purpose of this invention is to solve the problem that the force transmitted from the handwheel to the valve disc in existing gate valves is too large, which not only causes slight deformation of the valve seat and valve disc, but also damages the valve stem thread, thus causing valve sealing failure. Therefore, a new type of gate valve is proposed.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A novel gate valve is designed, comprising a valve body, a body cover bolt, and a valve cover. The valve cover is movably connected to the top of the valve body, and the body cover bolt is threadedly connected to the inside of the valve body and the valve cover. A valve stem is rotatably connected to the inside of the valve body, and a nut is threadedly installed at the top of the valve stem. A handwheel is threadedly installed on the inside of the nut. A valve seat is fixedly installed at the top of the inside of the valve body, and the top of the valve seat abuts against the lower end of the valve disc.

[0006] Preferably, a valve disc is fixedly installed at the bottom end of the valve stem, and a pilot valve disc is inserted into the bottom end of the valve disc.

[0007] Preferably, a drain hole is fixedly provided on the lower end outer wall of the valve stem.

[0008] Preferably, a packing gland is fixedly sleeved on the upper part of the valve cover, and the inner side of the packing gland is filled with packing.

[0009] Preferably, the inner side of the packing is rotatably connected to the top of the outer wall of the valve stem.

[0010] Preferably, the bottom end of the valve disc is pressed against the interior of the valve body.

[0011] The novel gate valve proposed in this utility model has the following advantages: when the valve disc is closed, because the medium still flows through the two small drainage holes on the valve stem, the closing force of the valve disc does not need to be large. After the valve disc is closed, the small hole at the bottom is gradually closed by the pilot valve disc. Because of this, the closing force of the valve is much smaller than that of the traditional gate valve, so the service life of the novel gate valve is longer. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 for Figure 1 A frontal sectional view; Figure 3 for Figure 2 Enlarged diagram of part A in the middle; Figure 4 for Figure 2 Enlarged diagram of part B in the middle.

[0013] In the diagram: 1. Valve body, 2. Body cover bolt, 3. Valve cover, 4. Packing, 5. Nut, 6. Handwheel, 7. Packing gland, 8. Valve stem, 9. Drain hole, 10. Valve disc, 11. Valve seat, 12. Pilot valve disc. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings: Example

[0015] Please see Figure 1-4 In this embodiment, a novel shut-off valve includes a valve body 1, a body cover bolt 2, and a valve cover 3. The valve cover 3 is movably connected to the top of the valve body 1. The body cover bolt 2 is threadedly connected to the inside of the valve body 1 and the valve cover 3. A valve stem 8 is rotatably connected to the inside of the valve body 1. A nut 5 is threadedly installed at the top of the valve stem 8. A handwheel 6 is threadedly installed on the inside of the nut 5. A valve disc 10 is fixedly installed at the bottom of the valve stem 8. A pilot valve disc 12 is inserted into the bottom of the valve disc 10. A drain hole 9 is fixedly opened on the outer wall of the lower end of the valve stem 8. A valve seat 11 is fixedly installed at the top of the inside of the valve body 1. The top of the valve seat 11 abuts against the lower end of the valve disc 10.

[0016] A packing gland 7 is fixedly fitted on the top of the valve cover 3. The inner side of the packing gland 7 is filled with packing 4. The packing gland 7 presses the packing 4 into the inside of the valve cover 3. The packing 4 is used to prevent the medium below from leaking upward along the valve stem 8. The inner side of the packing 4 is rotatably connected to the top of the outer wall of the valve stem 8. The bottom end of the valve disc 10 is pressed against the inside of the valve body 1.

[0017] The valve body 1 and the valve cover 3 are connected by body cover bolts 2. The valve disc 10 is located between the valve body 1 and the valve cover 3. The valve stem 8 is located in the upper part of the valve body 1. The pilot valve disc 12 is inserted into the center of the bottom plate of the valve disc 10. The handwheel 6 is fixed to the upper end of the valve stem 8 by the nut 5. Working principle: The purpose of the new type of shut-off valve is to replace the traditional shut-off valve in the ship's water vapor pipeline.

[0018] The connection structure of the new gate valve is as follows: the valve body 1 and the valve cover 3 are connected by the body cover bolt 2, the valve disc 10 is in the middle between the valve body 1 and the valve cover 3, the valve stem 8 is in the upper part of the valve body 1, the pilot valve disc 12 is inserted into the center of the bottom plate of the valve disc 10, and the handwheel 6 is fixed to the upper end of the valve stem 8 by the nut 5. According to the instruction manual Figure 2 As shown, the new type of gate valve is in the closed state. To open the valve, turn the handwheel 6 counterclockwise. As the handwheel 6 turns, the pilot valve disc 12 disengages from the valve disc 10, and the small valve port drain hole 9 also opens. The medium immediately flows in through the drain hole 9 at the bottom of the valve stem 8 and flows out through the drain hole 9 at the top of the valve stem 8. Because the medium flows into the valve body 1, when the valve disc 10 opens, there will be no water hammer impact of the medium. The packing gland 7 presses the packing 4 inside the valve cover 3. The packing 4 is used to prevent the medium below from leaking upwards along the valve stem 8. When valve disc 10 is closed, because there is still medium flowing through the two small drain holes 9 on valve stem 8, the closing force of valve disc 10 does not need to be large. After valve disc 10 is closed, the small hole at the bottom is gradually closed by pilot valve disc 12. Because of this, the closing force of the valve is much smaller than that of the traditional gate valve, so the service life of the new gate valve is longer.

[0019] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A novel shut-off valve, comprising a valve body (1), a body cover bolt (2), and a valve cover (3), wherein the valve cover (3) is movably connected to the top of the valve body (1), and the body cover bolt (2) is threadedly connected to the interior of the valve body (1) and the valve cover (3), characterized in that: A valve stem (8) is rotatably connected to the inner side of the valve body (1). A nut (5) is threaded onto the top of the valve stem (8). A handwheel (6) is threaded onto the inner side of the nut (5). A valve seat (11) is fixedly installed at the top of the inner side of the valve body (1). The top of the valve seat (11) abuts against the lower end of the valve disc (10).

2. The novel shut-off valve according to claim 1, characterized in that: A valve disc (10) is fixedly installed at the bottom end of the valve stem (8), and a pilot valve disc (12) is inserted into the bottom end of the valve disc (10).

3. The novel shut-off valve according to claim 1, characterized in that: A drain hole (9) is fixedly opened on the lower outer wall of the valve stem (8).

4. The novel shut-off valve according to claim 1, characterized in that: A packing gland (7) is fixedly sleeved on the top of the valve cover (3), and the inner side of the packing gland (7) is filled with packing (4).

5. The novel shut-off valve according to claim 4, characterized in that: The inner side of the packing (4) is rotatably connected to the top of the outer wall of the valve stem (8).

6. The novel shut-off valve according to claim 2, characterized in that: The bottom end of the valve disc (10) is pressed against the inside of the valve body (1).

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