The non-return butterfly valve is an important fluid control equipment, which is widely used in various industrial, building and household systems to control the flow of fluid. The following will detail the structure, characteristics and working principle of the check butterfly valve.

1. structure

The check butterfly valve is mainly composed of valve body, valve disc (butterfly plate), valve stem and seal. Among them, the valve body is the shell of the valve, which plays a role in supporting and protecting the internal components; the valve disc is the core part of the valve, it is like a rotating disc (butterfly plate), which rotates within the valve body to achieve the purpose of switching; The valve stem is the part that connects the valve disc and the handle, and is responsible for transmitting torque; The seal ensures the sealing performance of the valve.

2. features

The characteristics of the check butterfly valve are mainly reflected in the following aspects:

1. Low fluid resistance: Due to the design of the butterfly plate, the resistance when the fluid passes through the valve is small, which can effectively reduce the pressure loss of the fluid system.

2. Good sealing performance: A special sealing structure is adopted to ensure that the valve has good sealing performance during the switching process.

3. Wide range of application: suitable for a variety of fluid media, including water, steam, oil, etc.

4. Long life: structural design and material selection are considered durability, making the service life of the valve longer.

3. working principle

The working principle of the non-return butterfly valve is based on the rotary motion of the butterfly plate. When the butterfly plate rotates to a position parallel to the valve seat, the fluid can pass smoothly; when the butterfly plate rotates to a position perpendicular to the valve seat, the fluid is blocked to realize the switch control of the fluid. In addition, the non-return butterfly valve also has a non-return function, that is, when the fluid flows from the high-pressure side to the low-pressure side, the valve can automatically open; when the fluid flows in the reverse direction, the valve will automatically close to prevent the fluid from flowing back.

4. Summary

The non-return butterfly valve is widely used in various fluid systems because of its simple structure, convenient operation, low fluid resistance and good sealing performance. Its working principle is based on the rotating motion of the butterfly plate, the switch control of the fluid is realized by rotating the butterfly plate, and it has the function of automatically preventing the fluid from flowing back. Understanding the structure, characteristics and working principle of the check butterfly valve will help to better apply and maintain this important fluid control equipment.