Butterfly valve knowledge: working principle of pneumatic butterfly valve

Pneumatic butterfly valve is a valve composed of a pneumatic actuator and a butterfly valve. Pneumatic butterfly valve is equipped with pneumatic actuator, solenoid valve coil, air filter pressure reducing valve, and signal feedback device on the butterfly valve, which enables it to adapt to some high-risk working environments and reduce the danger that may be caused by manual operation. Especially in low-pressure large and medium diameter pipelines, the use of pneumatic butterfly valve is increasing. In addition, large-diameter pneumatic butterfly valve is more economical compared to other pneumatic valves (pneumatic ball valve, pneumatic cut-off valve, pneumatic gate valve, pneumatic globe valve).

Soft sealed pneumatic butterfly valve - Shanghai Yonglong

Pneumatic butterfly valves have a wide range of applications due to their simple structure, easier maintenance and repair, and quick opening and closing. This not only greatly improves work efficiency, but also reduces maintenance and repair time, and lowers labor costs. In addition, pneumatic butterfly valves can be equipped with sealing rings and components made of different materials according to customer requirements to adapt to different media and working environments, thereby enabling the pneumatic butterfly valve to achieve its intended use. The actuator of pneumatic butterfly valve can be divided into single acting (normally closed) and double acting (normally open) forms. The single acting actuator has the function of spring reset, which can automatically close or open when the air source is lost, with a higher safety factor! And for double acting pneumatic actuators, when the gas source is lost, the pneumatic actuator loses power and the valve position will remain at the position it was in when the gas was lost.

Working principle of pneumatic butterfly valve:

Pneumatic butterfly valves are equipped with pneumatic actuators to replace manual operation. Its working principle is to use compressed air as a power source to drive the valve stem to rotate, which in turn drives the disc-shaped butterfly plate to rotate. The initial position of the butterfly plate is determined according to actual needs. When the butterfly plate rotates to 90 ° with the valve body, the pneumatic butterfly valve is in a fully open state. When the butterfly valve rotates to 0 ° or 180 ° with the valve body, the pneumatic butterfly valve is in a closed state.

Clamp type pneumatic butterfly valve - Yonglong valve

The pneumatic actuator of the pneumatic butterfly valve runs relatively fast and is rarely damaged due to jamming during the action execution process. Pneumatic butterfly valves can be used as pneumatic cut-off valves or equipped with valve positioners to achieve regulation and control of the medium in pipelines. Widely used in industries such as chemical, papermaking, coal mining, petroleum, medical, and water conservancy.