CN221897152U - A hard-sealed high-pressure gate valve - Google Patents

Abstract

The utility model discloses a hard-sealed high-pressure gate valve, which belongs to the field of gate valve technology, and solves the problem that when the pressure difference on both sides is relatively large, the gap there will become the most leaky part of the entire gate valve, and the side with high air pressure will push the gate valve open so that the air pressure on both sides can be consistent. It includes a valve body, a valve cover that closes the upper end of the valve body, a valve stem that penetrates the valve cover to the valve body, and a valve plate that is fixedly connected to the lower end of the valve stem and vertically displaced in the valve cover and the valve body. An upper airway is opened in the valve stem along its length direction, and a lower airway that is connected to the upper airway and penetrates its bottom surface is opened in the valve plate. The air pressure in the upper airway and the lower airway can be adjusted. The utility model uses an air pump to suck the internal air, significantly reduce the air pressure, fix the position of the valve plate, and the cylinder further compresses the space to discharge the gas, close the solenoid valve and the air pump, maintain a very small air pressure state, and stably install the valve plate. Even if the air pressure difference on both sides is large, it is not easy to push the valve plate open.

Description

A hard-sealed high-pressure gate valve

Technical Field

The utility model relates to the technical field of gate valves, in particular to a hard-sealed high-pressure gate valve.

Background Art

A gate valve is a valve commonly used in pipeline systems, usually used to open or close the fluid in the pipeline. The gate valve is characterized by a small flow resistance, relatively fast opening and closing, and good sealing performance. The gate valve has a simple structure and is mainly composed of a valve body, a valve cover, a valve stem, a gate plate and other components. The gate plate is a key component of the gate valve, and the fluid is blocked by lifting or lowering the gate plate. The gate valve is suitable for occasions with large fluid flow requirements, small resistance, and frequent switching, such as industrial pipelines, water supply and drainage systems, etc. Since the opening and closing operations of the gate valve require a large force, it is usually used in fully open or fully closed occasions and is not suitable for regulating flow. Gate valves are widely used in the industrial field, and gate valves of different materials and structures are available to meet various fluid control needs.

The gate valve in the prior art mainly uses the valve plate to complete the isolation of the channels on both sides in a hard sealing manner. However, for hard sealing, even if the two planes are tightly fitted together, there will be a certain gap. When the pressure difference on both sides is large, the gap at this location will become the most leak-prone part of the entire gate valve. The side with high air pressure will push the gate valve open so that the air pressure on both sides can be consistent. Therefore, this location also needs to be processed in a certain way to enhance the sealing performance at this location.

Therefore, a hard-sealed high-pressure gate valve is proposed to solve or alleviate the above problems.

Utility Model Content

The utility model aims to solve the shortcomings in the prior art and proposes a hard-sealed high-pressure gate valve.

In order to achieve the above purpose, the utility model adopts the following technical solutions:

A hard-sealed high-pressure gate valve comprises a valve body, a valve cover closing the upper end of the valve body, a valve stem penetrating the valve cover into the valve body, and a valve plate fixedly connected to the lower end of the valve stem and vertically displaced within the valve cover and the valve body, wherein an upper air passage is provided in the valve stem along its length, and a lower air passage is provided in the valve plate which is connected to the upper air passage and penetrating its bottom surface, and the air pressure in the upper air passage and the lower air passage is adjustable.

Preferably, an inlet communicating with the upper airway is provided on the outer peripheral wall of the upper end of the valve stem, and an air pipe communicating with the inlet is fixedly connected to the valve stem, and the air pipe is used to connect to an air pump.

Preferably, the upper end of the valve stem is fixedly connected to a cylinder, and the piston in the cylinder is fixedly connected to an air compression component that penetrates into the upper airway.

Preferably, the air compressor includes a connecting arc tube portion fixedly connected to the piston, and a connecting tube portion fixedly connected to the lower end of the connecting arc tube portion, the cross-section of the connecting tube portion is annular, the cross-section of the connecting arc tube portion is arc-shaped, and the two ends of the notch of the connecting arc tube portion are located on both sides of the inlet.

Preferably, the air pipe is connected to a solenoid valve.

Preferably, a V-shaped connecting slope is provided on the bottom surface of the valve plate, and the inner bottom surface of the valve body is arranged to fit the connecting slope.

The utility model has the following beneficial effects:

When the valve plate needs to be isolated on both sides of the channel in the valve body and the air pressure difference on both sides is large, the utility model realizes the isolation function by driving the cylinder and the valve plate to move through the valve stem. After the isolation is completed, the air pump starts to work to reduce the air pressure and stabilize the position of the valve plate. The cylinder further compresses the upper and lower airway spaces to expel part of the gas. After closing the solenoid valve and the air pump, an extremely low air pressure state is maintained to ensure that the valve plate is firmly installed to avoid being pushed open.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of the structure of the utility model;

Fig. 2 is a cross-sectional view of the utility model;

FIG3 is an enlarged view of point A in FIG2 ;

FIG. 4 is an enlarged view of point B in FIG. 2 .

1. Valve body; 2. Valve cover; 3. Valve stem; 4. Valve plate; 5. Air pipe; 6. Cylinder; 7. Upper airway; 8. Lower airway; 9. Connecting slope; 10. Connecting pipe part; 11. Connecting arc pipe part; 12. Inlet.

DETAILED DESCRIPTION

The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

A hard-sealed high-pressure gate valve, as shown in FIGS. 1 and 2 , comprises a valve body 1, a valve cover 2 closing the upper end of the valve body 1, a valve stem 3 penetrating the valve cover 2 into the valve body 1, and a valve plate 4 fixedly connected to the lower end of the valve stem 3 and vertically displaced within the valve cover 2 and the valve body 1. As shown in FIG. 4 , a V-shaped connecting slope 9 is provided on the bottom surface of the valve plate 4, and the inner bottom surface of the valve body 1 is arranged to fit the connecting slope 9.

As shown in Figures 2 and 3, an upper air duct 7 is opened in the valve stem 3 along its length direction, a lower air duct 8 is opened in the valve plate 4 and is connected with the upper air duct 7 and runs through the bottom surface thereof, the air pressure in the upper air duct 7 and the lower air duct 8 is adjustable, an inlet 12 connected with the upper air duct 7 is opened on the outer peripheral wall of the upper end of the valve stem 3, an air pipe 5 connected with the inlet 12 is fixedly connected to the valve stem 3, the air pipe 5 is connected to a solenoid valve, the air pipe 5 is used to connect an air pump, the upper end of the valve stem 3 is fixedly connected to a cylinder 6, and a piston in the cylinder 6 is fixedly connected to an air compression component that runs through the upper air duct 7.

As shown in Figure 3, the air compression component includes a connecting arc tube portion 11 fixedly connected to the piston, and a connecting tube portion 10 fixedly connected to the lower end of the connecting arc tube portion 11. The cross-section of the connecting tube portion 10 is annular, and the cross-section of the connecting arc tube portion 11 is arc-shaped. The two ends of the notch of the connecting arc tube portion 11 are located on both sides of the inlet 12.

When the utility model needs to cut off the two sides of the passage in the valve body 1 with the valve plate 4 and there is a large difference in the air pressure on both sides, it is only necessary for the valve stem 3 to drive the cylinder 6 and the valve plate 4 to move together, so that the valve plate 4 can cut off the passage in the valve body 1, and because there is a connecting inclined surface 9 between the bottom surface of the valve plate 4 and the inner bottom surface of the valve body 1, the contact area when the two are fitted is also larger than that of a conventional gate valve. In addition, when the valve plate 4 moves downward, the V-shaped connecting inclined surface 9 can be used to cut the fluid, so that the valve plate 4 can cut off the fluid more easily and smoothly. After the cut-off, the air pump works to suck the internal air into the air pipe 5, and the air leaves the valve stem 3 and the valve plate 4 in the order of the air pipe 5, the inlet 12, the upper airway 7 and the lower airway 8. Under the guidance of the air pump, the air pump 12 is pressed against the upper airway 7 and the lower airway 8. The air pressure therein also begins to decrease significantly, and the external atmospheric pressure can press the valve plate 4 firmly in the valve body 1 and prevent it from moving. After a certain period of suction, the cylinder 6 starts to work, which drives the connecting arc tube part 11 and the connecting tube part 10 to move downward, so that the space in the upper airway 7 and the lower airway 8 is further compressed, and a part of the air that the air pump cannot extract is further squeezed to leave through the inlet 12 and the air pipe 5. After closing the solenoid valve, the air pipe 5 is blocked, and the air pump is turned off at the same time, so that the upper airway 7 and the lower airway 8 can maintain a very small air pressure state, so that the external air pressure can firmly press them in the valve body 1. Even if there is a strong air pressure difference on both sides of the valve plate 4, the valve plate 4 can be stably installed in the valve body 1 without being pushed open.

The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims (6)

1. A hard-sealed high-pressure gate valve, characterized in that it comprises a valve body (1), a valve cover (2) closing the upper end of the valve body (1), a valve stem (3) penetrating the valve cover (2) into the valve body (1), and a valve plate (4) fixedly connected to the lower end of the valve stem (3) and vertically displaced in the valve cover (2) and the valve body (1), wherein an upper air duct (7) is provided in the valve stem (3) along its length direction, and a lower air duct (8) is provided in the valve plate (4) and is connected to the upper air duct (7) and penetrating its bottom surface, and the air pressure in the upper air duct (7) and the lower air duct (8) is adjustable. 2. A hard-sealed high-pressure gate valve according to claim 1, characterized in that an inlet (12) connected to the upper airway (7) is opened on the outer peripheral wall of the upper end of the valve stem (3), and an air pipe (5) connected to the inlet (12) is fixedly connected to the valve stem (3), and the air pipe (5) is used to connect to an air pump. 3. A hard-sealed high-pressure gate valve according to claim 1, characterized in that the upper end of the valve stem (3) is fixedly connected to a cylinder (6), and the piston in the cylinder (6) is fixedly connected to an air compression component that penetrates into an upper air duct (7). 4. A hard-sealed high-pressure gate valve according to claim 3, characterized in that the air compression component includes a connecting arc tube portion (11) fixedly connected to the piston, and a connecting pipe portion (10) fixedly connected to the lower end of the connecting arc tube portion (11), the cross-section of the connecting pipe portion (10) is annular, the cross-section of the connecting arc tube portion (11) is arc-shaped, and the two ends of the notch of the connecting arc tube portion (11) are located on both sides of the inlet (12). 5. A hard-sealed high-pressure gate valve according to claim 2, characterized in that the air pipe (5) is connected to a solenoid valve. 6. A hard-sealed high-pressure gate valve according to claim 1, characterized in that a V-shaped connecting slope (9) is provided on the bottom surface of the valve plate (4), and the inner bottom surface of the valve body (1) is arranged to fit the connecting slope (9).