CN204610891U - A kind of butterfly valve seal structure - Google Patents

Abstract

The utility model discloses a sealing structure of a butterfly valve, which belongs to the technical field of valves. In order to solve the problems of frictional resistance and wear of valve opening and closing, the utility model comprises a butterfly valve and an actuator arranged above the butterfly valve. The valve seat in the chamber and the valve plate that rotates with the rotating shaft at 0 to 90°, the valve plate is connected with the actuator through the rotating shaft, the valve seat is an elastic valve seat, and is firmly connected to the seat fixing base set in the valve chamber. On the seat, an airtight cavity is formed between the valve seat fixing base and the valve seat, and a connection hole communicating with the airtight cavity is provided on the valve chamber, and the connection hole is controlled by the pipeline and the external fluid pressure. The equipment is connected, and the elastic valve seat is in close contact with or separated from the edge of the valve plate. The utility model adopts an expansion valve seat, the contact area between the valve seat and the valve plate is increased after expansion, the sealing effect is better, and the starting torque of the valve plate is small, the action is sensitive, and there is almost no wear between the valve plate and the valve seat. long life.

Description

A butterfly valve sealing structure

technical field

The utility model relates to a gate valve sealing device in the gate valve field, in particular to a butterfly valve sealing structure.

Background technique

The butterfly valve is installed in a cylindrical valve chamber with a disc-shaped butterfly valve plate, which rotates from 0 to 90° around the axis. When the butterfly plate is at 0°, the valve is completely closed; when it is rotated to 90°, Then the valve is fully opened. Due to the advantages of simple structure, small size, light weight, flexible operation, convenient installation, and large flow capacity, butterfly valves are increasingly used in pipeline installations. However, the traditional butterfly valve (as shown in Figure 1) is directly sealed by the tight connection between the valve plate 4 and the valve seat 5, resulting in strong friction between the valve plate 4 and the valve seat 5 arranged on the inner wall of the valve chamber 3 when opening and closing, reducing the valve service life, and the torque is larger when starting and closing, requiring the actuator to provide greater power.

Utility model content

Aiming at the defects existing in the traditional butterfly valve sealing device, the utility model provides a butterfly valve sealing structure.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a butterfly valve sealing structure, including a butterfly valve and an actuator arranged above the butterfly valve, the butterfly valve includes a valve chamber, a valve seat arranged in the valve chamber and a rotating shaft 0～90°rotating valve plate, the valve plate is connected with the actuator through the rotating shaft, the valve seat is an elastic valve seat, and is firmly connected to the valve seat fixing base set in the valve chamber, the valve seat fixing base An airtight cavity is formed between the seat and the valve seat, and a connection hole communicating with the airtight cavity is located on the valve chamber, and the connection hole is connected with the external fluid pressure control equipment through a pipeline, and the elastic valve seat and the valve plate The edges are in close contact or separated.

The utility model further provides a sealing structure for a butterfly valve, the two sides of the seat fixing base are provided with slots for connecting and fixing the valve seat, the cavity wall of the airtight cavity is composed of the surface wall of the valve seat and the The surface wall of the fixed base is composed of the valve seat forming the cavity wall of the airtight cavity, and the surface wall of the fixed base is a concave ring surface.

The utility model further provides a butterfly valve sealing structure, the elastic valve seat is made of nitrile rubber, polyurethane or fluorine rubber.

The beneficial effect of the utility model: adopting the expansion valve seat, the contact area between the valve seat and the valve plate is increased after expansion, the sealing effect is better, and the starting torque of the valve plate is small, the action is sensitive, and the gap between the valve plate and the valve seat is almost No wear and tear, long service life.

Description of drawings

Figure 1. Schematic diagram of the sealing device of a traditional butterfly valve;

Fig. 2, the overall structure schematic diagram of the utility model;

Fig. 3, the structure schematic diagram when the utility model valve is closed;

Fig. 4 is a structural schematic diagram of the utility model when the valve is opened.

Detailed ways

In order to improve the defects of low service life and high torque of the traditional butterfly valve, a butterfly valve sealing structure (as shown in Figure 2 to Figure 4) is designed, including butterfly valve 1 and actuator 2 arranged above butterfly valve 1, butterfly valve 1 includes valve chamber body 3 , The valve seat 5 arranged in the valve chamber body 3 and the valve plate 4 rotating with the rotating shaft 0-90°, the valve plate 4 is connected with the actuator 2 through the rotating shaft, the valve seat 5 is an elastic valve seat, and fastened Connected to the valve seat fixing base provided in the valve chamber body 3, an airtight cavity is formed between the valve seat fixing base and the valve seat 5, and a valve located on the valve chamber body 3 communicates with the airtight cavity The connecting hole 6 is connected to the external fluid pressure control equipment through a pipeline, and the elastic valve seat is in close contact with or separated from the edge of the valve plate 4 .

Both sides of the valve seat fixing base are provided with draw-in grooves for connecting and fixing the valve seat 5, and the cavity wall of the airtight cavity is composed of the surface wall of the valve seat 5 and the surface wall of the valve seat fixing base. The surface wall of the valve seat fixing base of the cavity wall of the airtight cavity is a concave ring surface.

The elastic valve seat is made of nitrile rubber, polyurethane or fluorine rubber.

The external fluid pressure control equipment includes a power source, a modular process control valve, and an air-controlled two-position five-way solenoid valve, wherein the modular process control valve consists of a flow regulating valve, a pressure regulating valve, a pressure gauge, and a one-way quick Exhaust valve composition.

The working principle of the utility model: under the control of the two-position five-way solenoid valve, the pneumatic actuator 2 pushes the rotation of the valve plate 4 to realize the opening and closing of the valve. When the butterfly valve 1 moves to the closed position, the valve plate 4 only touches the valve seat 5 momentarily, which can reduce friction, wear and torque; after the valve is closed, under the control and action of the air-controlled two-position five-way solenoid valve, The valve seat 5 expands toward the valve plate 4, thereby providing a larger sealing surface, having a better sealing effect, and providing uniform pressure on the valve plate 4; before opening the valve, the air-controlled two-position five-way solenoid valve controls the valve seat 5 And the pneumatic actuator 2, so that the valve seat 5 is first tightened, and then the valve plate 4 is free to rotate to the open position.

The beneficial effect of the utility model: adopting the expansion valve seat, the contact area between the valve seat and the valve plate is increased after expansion, the sealing effect is better, and the starting torque of the valve plate is small, the action is sensitive, and the gap between the valve plate and the valve seat is almost No wear and tear, long service life.

Simple replacement and replacement by those skilled in the art are all within the protection scope of this patent.

Claims (3)

1. A sealing structure for a butterfly valve, comprising a butterfly valve (1) and an actuator (2) arranged above the butterfly valve (1), the butterfly valve (1) including a valve chamber (3), a valve chamber (3) The valve seat (5) and the valve plate (4) that rotates with the rotating shaft 0-90°, the valve plate (4) is connected with the actuator (2) through the rotating shaft, it is characterized in that the valve seat (5) is an elastic valve seat, and fastened to the valve seat fixing base provided in the valve chamber body (3), a closed cavity is formed between the valve seat fixing base and the valve seat (5), and is located in the valve chamber body (3 ) is provided with a connection hole (6) communicating with the airtight cavity, the connection hole (6) is connected to the external fluid pressure control equipment through a pipeline, and the elastic valve seat is in close contact with or separated from the edge of the valve plate (4) . 2. The sealing structure of a butterfly valve according to claim 1, characterized in that, the two sides of the seat fixing base are provided with draw-in grooves for connecting and fixing the valve seat (5), and the cavity wall of the airtight cavity It is composed of the surface wall of the valve seat (5) and the surface wall of the valve seat fixing base, and the surface wall of the valve seat fixing base forming the cavity wall of the closed cavity is a concave ring surface. 3. A butterfly valve sealing structure according to claim 1 or 2, characterized in that the elastic valve seat is made of nitrile rubber, polyurethane or fluororubber.