A pressure-balanced shut-off valve

Abstract

This utility model discloses a pressure-balanced gate valve belonging to the field of gate valve technology. It includes a valve body with a lower medium channel and an upper medium channel at its internal ends. A valve disc is provided at the connection between the lower and upper medium channels. The top of the valve disc is fixedly connected to a threaded sleeve via a valve seat. An inclined support plate is fixedly installed on the bottom of the valve disc near the inner end of the lower medium channel. When the valve disc is closed, the inclined support plate contacts the inner bottom surface of the lower medium channel. By providing an inclined support plate at the bottom of the valve disc, the pressure exerted by the medium in the lower medium channel on the inclined support plate cancels out the pressure exerted by the medium on the valve disc, thereby reducing the pressure difference on the valve disc. This ensures the stability of the valve disc and prevents excessive pressure difference between the upper and lower parts of the valve disc, which could affect valve closure and sealing.

Description

Technical Field

[0001] This utility model belongs to the field of gate valve technology, specifically relating to a pressure-balanced gate valve. Background Technology

[0002] Gate valves are widely used in industries such as power, water, chemical, oil refining, and metallurgy. Existing gate valves mainly consist of a valve body, valve seat, valve disc, valve stem, and threaded sleeve. A medium passage is provided in the valve body. The valve seat is threaded into the middle of the medium passage in the valve body. The valve disc rests on the valve seat and is connected to the lower end of the valve stem. A handwheel is mounted on the upper end of the valve stem. The inner and outer surfaces of the threaded sleeve are threaded to the valve stem and valve body, respectively. During operation, rotating the handwheel at the top of the valve stem rotates the valve stem. Through the threaded action between the valve stem and the threaded sleeve, the valve stem and its lower valve disc move up and down. The valve disc opens / closes the passage in the valve body, thus opening / closing the gate valve.

[0003] Currently, in existing pressure-balanced gate valves, the medium flows in from the lower end of the sealing surface when the valve is opened and flows out from the higher end after passing through the sealing surface. However, most gate valves have unbalanced gate channels, which results in a significant difference in medium pressure between the upper and lower ends when the valve disc is closed. The pressure in the lower medium channel is greater than the pressure in the upper medium channel, making it difficult for the valve disc to close. In severe cases, this may affect the sealing performance of the valve disc when the valve is closed. Therefore, we propose a pressure-balanced gate valve. Utility Model Content

[0004] The purpose of this invention is to provide a pressure-balanced shut-off valve to solve the existing problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pressure-balanced shut-off valve, comprising a valve body, a valve disc, and an inclined support plate. The valve body has a lower medium channel and an upper medium channel at its two internal ends, respectively. A valve disc is provided at the connection between the lower and upper medium channels. The top of the valve disc is fixedly connected to a threaded sleeve via a valve seat. The top of the threaded sleeve extends to the top of the valve body and is slidably and sealingly connected thereto. An inclined support plate is fixedly installed on the bottom of the valve disc near the inner end of the lower medium channel. When the valve disc is closed, the inclined support plate contacts the inner bottom surface of the lower medium channel.

[0006] Preferably, the top of the valve body is movably connected to a screw extending to the top of the valve body via a sealed bearing, the top of the threaded sleeve is provided with a threaded groove, and the bottom end of the screw extends into the interior of the threaded groove and is slidably connected to its inner wall.

[0007] Preferably, a first sealing ring is fitted around the outer periphery of the valve disc, and the inner ring of the first sealing ring is embedded inside the outer periphery of the valve disc and fixedly connected thereto.

[0008] Preferably, the outer periphery of the threaded sleeve is provided with multiple layers of second sealing rings, and the inner ring of the second sealing ring is embedded in the inner periphery of the threaded sleeve and fixedly connected thereto.

[0009] Preferably, the top of the valve body has a cavity, and the cavity has limit grooves on both sides. The top of the threaded sleeve has limit blocks that are integral with the threaded sleeve, and the limit blocks extend into the limit grooves and are slidably connected to their inner walls.

[0010] Preferably, a handwheel is provided at the top of the screw, and the bottom center of the handwheel is fixedly connected to the top of the screw by welding.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. By setting an inclined support plate at the bottom of the valve disc, the pressure exerted by the medium in the lower medium channel on the inclined support plate is offset by the pressure exerted by the medium in the lower medium channel on the valve disc, thereby reducing the pressure difference on the valve disc. This ensures the stability of the valve disc and prevents the pressure difference between the upper and lower parts of the valve disc from being too large, which could affect the valve disc's closing and sealing performance.

[0013] 2. By opening limiting grooves on the inner walls of both sides of the cavity, and cooperating with the limiting blocks on both sides of the top of the threaded sleeve, the threaded sleeve is limited, thus preventing the threaded sleeve from rotating with the screw and causing the threaded sleeve to be unable to push the valve disc to move. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the cross-sectional structure of the valve body of this utility model;

[0016] Figure 3 This is a schematic diagram of the inclined load-bearing plate structure of this utility model.

[0017] In the diagram: 1. Valve body; 2. Lower medium passage; 3. Upper medium passage; 4. Valve disc; 5. First sealing ring; 6. Inclined bearing plate; 7. Valve seat; 8. Threaded sleeve; 9. Second sealing ring; 10. Threaded groove; 11. Screw; 12. Handwheel; 13. Cavity; 14. Limiting groove; 15. Limiting block. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-3 This utility model provides a pressure-balanced shut-off valve technical solution: it includes a valve body 1, a valve disc 4, and an inclined support plate 6. The valve body 1 has a lower medium channel 2 and an upper medium channel 3 respectively located at its two internal ends. The valve disc 4 is located at the connection between the lower and upper medium channels 2 and 3. The top of the valve disc 4 is fixedly connected to a threaded sleeve 8 via a valve seat 7. The top of the threaded sleeve 8 extends to the top of the valve body 1 and slides and seals with it. An inclined support plate 6 is fixedly installed on the bottom of the valve disc 4 near the inner end of the lower medium channel 2. When the valve disc 4 is closed, the inclined support plate 6 contacts the inner bottom surface of the lower medium channel 2. By setting an inclined support plate 6 at the bottom of the valve disc 4, the inclined support plate 6 contacts the medium in the lower medium channel 2. At the same time, the medium in the lower medium channel 2 applies pressure to the valve disc 4 and also applies pressure to the surface of the inclined support plate 6. This causes the inclined support plate 6 to provide a downward pulling force on the valve disc 4. Combined with the force applied in the upper medium channel 3 and the pressure applied to the valve seat 7 and valve disc 4 by the threaded sleeve 8, the valve disc 4 can be in a relatively balanced pressure state. This avoids the situation where the pressure difference between the lower medium channel 2 and the upper medium channel 3 is too large, which would make it difficult for the valve disc 4 to close or affect its sealing effect.

[0020] Specifically, the top of the valve body 1 is movably connected to a screw 11 extending to the top of the inside of the valve body 1 via a sealed bearing. The top of the threaded sleeve 8 is provided with a threaded groove 10, and the bottom end of the screw 11 extends into the inside of the threaded groove 10 and is slidably connected to its inner wall.

[0021] Specifically, a first sealing ring 5 is sleeved on the outer periphery of the valve disc 4, and the inner ring of the first sealing ring 5 is embedded in the inner periphery of the valve disc 4 and fixedly connected thereto.

[0022] Specifically, the outer circumference of the threaded sleeve 8 is provided with multiple layers of second sealing rings 9, and the inner ring of the second sealing ring 9 is embedded in the inner circumference of the threaded sleeve 8 and fixedly connected thereto.

[0023] Specifically, a cavity 13 is provided inside the top of the valve body 1, and a limiting groove 14 is provided on both sides of the cavity 13. A limiting block 15, which is integral with the threaded sleeve 8, is fixedly provided on both sides of the top of the threaded sleeve 8. The limiting block 15 extends into the interior of the limiting groove 14 and is slidably connected to its inner wall.

[0024] Specifically, a handwheel 12 is provided on the top of the screw 11, and the bottom center of the handwheel 12 is fixedly connected to the top of the screw 11 by welding.

[0025] In this embodiment, during use, when valve disc 4 is closed, the inclined support plate 6 contacts the medium in the lower medium channel 2. This allows the medium in the lower medium channel 2 to exert pressure on valve disc 4, while simultaneously applying pressure to the surface of the inclined support plate 6. This results in the inclined support plate 6 providing a downward pulling force on valve disc 4. Combined with the force applied in the upper medium channel 3 and the pressure exerted on valve disc 4 by the threaded sleeve 8, valve disc 4 maintains a relatively balanced pressure. This prevents a large pressure difference between the lower and upper medium channels 2, which could hinder valve disc 4 from closing or affect its sealing effect. When valve disc 4 needs to be closed after opening, the bottom end of the inclined support plate 6 is located within the upper medium channel 3 or within the upper medium channel 4. When the medium flows from the lower medium channel 2 into the upper medium channel 3, the pressure generated by the medium in the lower medium channel 2 flowing into the upper medium channel 3 will act on the bottom of the inclined support plate 6. However, since the inclined support plate 6 is an inclined structure, the direction of the force changes, thereby reducing the pressure. This avoids the situation where the valve disc 4 is difficult to close due to excessive pressure. When the bottom end of the inclined support plate 6 is placed inside the lower medium channel 2, the pressure generated by the medium in the lower medium channel 2 gradually acts on the upper part of the inclined support plate 6, thereby gradually offsetting the pressure below, so as to facilitate the closure of the valve disc 4. Compared with the traditional valve disc 4 structure, this can greatly reduce the difficulty of closing the valve disc 4, and at the same time avoid the situation where the pressure difference is too large, which would affect the sealing performance of the valve disc 4.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure balanced globe valve comprising a valve body (1), a valve disc (4) and a beveled load plate (6), characterized in that: The inside of the valve body (1) is provided with a lower medium passage (2) and an upper medium passage (3) at both ends, respectively, and the communication part of the lower medium passage (2) and the upper medium passage (3) is provided with a valve clack (4), the top of the valve clack (4) is fixedly connected with a threaded sleeve (8) through a valve seat (7), the top end of the threaded sleeve (8) extends to the inside top end of the valve body (1) and is in sliding and sealing connection with it, and the bottom of the valve clack (4) is fixedly installed with an inclined bearing plate (6) on the side close to the inner end of the lower medium passage (2), and the inclined bearing plate (6) is in contact with the inside bottom surface of the lower medium passage (2) in the closed condition of the valve clack (4).

2. A pressure balanced globe valve according to claim 1, wherein: The top of the valve body (1) is movably connected with a screw rod (11) extending to the inside top end of the valve body (1) through a sealing bearing, the top of the threaded sleeve (8) is provided with a threaded groove (10), and the bottom end of the screw rod (11) extends to the inside of the threaded groove (10) and is in sliding connection with the inner wall thereof.

3. A pressure balanced globe valve according to claim 1, wherein: The outer periphery of the valve clack (4) is provided with a first sealing ring (5), and the inner ring of the first sealing ring (5) is embedded in the outer periphery inside of the valve clack (4) and is fixedly connected therewith.

4. A pressure balanced globe valve in accordance with claim 1 wherein: The outer periphery of the threaded sleeve (8) is provided with a plurality of second sealing rings (9), and the inner ring of the second sealing ring (9) is embedded in the outer periphery inside of the threaded sleeve (8) and is fixedly connected therewith.

5. A pressure balanced globe valve in accordance with claim 1 wherein: The inside top end of the valve body (1) is provided with a cavity (13), the inside of the cavity (13) is provided with a limiting groove (14) at both sides, the top end of the threaded sleeve (8) is fixedly provided with a limiting block (15) which is an integral part of the threaded sleeve (8), and the limiting block (15) extends to the inside of the limiting groove (14) and is in sliding connection with the inner wall thereof.

6. A pressure balanced globe valve in accordance with claim 2 wherein: The top of the screw rod (11) is provided with a hand wheel (12), and the bottom center position of the hand wheel (12) is fixedly connected with the top of the screw rod (11) by welding.

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