Do you know the working principle and specific classification of pneumatic butterfly valves?

   The pneumatic butterfly valve is composed of a pneumatic actuator and a butterfly valve, which is a circular butterfly plate rotating with the valve stem, and has the opening and closing property to make the action effective, mainly used as a stop valve. In addition, it can also be designed to have both regulating or stage valves and regulating functions, and the use of butterfly valves in low pressure medium and large diameter piping is increasing. The main advantages of the pneumatic butterfly valve are simple structure, small size, light weight and low cost. Butterfly valve this feature is particularly obvious, installed in the overhead tunnel, through the two five-way solenoid valve control operation is convenient, adjust the flow medium.

Pneumatic butterfly valve

The classification of pneumatic butterfly valves mainly includes pneumatic clamping, pneumatic lining, pneumatic lining, pneumatic ventilation, pneumatic expansion and so on.

First, the working principle of pneumatic butterfly valve:

1, the butterfly valve is a circular butterfly plate rotating with the valve, with opening and closing, so that the effective action of the air valve is mainly used as a stop valve. In addition, it can also be designed to have the function of regulating or segmenting valves and regulation. The use of disc valves in low and medium diameter piping is increasing.

2. The butterfly valve is composed of simple structure, small size, light weight and small number of parts. In addition, only need to rotate 90, you can quickly open and close, simple operation, and the electric valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the single resistance of the medium flowing in the spool, and therefore the pressure drop generated through the valve

3, because small, so the flow control characteristics are good. There are two types of butterfly valve seal: bomb seal and metal seal. Elastomeric sealing valves, sealing rings can be embedded in the valve body, can also be installed around the butterfly plate.

If the butterfly valve is required to be used as a flow control, it is mainly necessary to correctly select the size and type of the valve. The structure principle of the pneumatic butterfly valve is especially suitable for the production of large diameter valves. Not only widely used in oil, natural gas, chemical, water treatment and other general industry, but also used in thermal power plant cooling water system.

Second, the specific classification of pneumatic butterfly valves:

1, pneumatic sandwich type

The structure is novel, the valve body structure meets the short distance chuck structure formed by the narrow space of the pipeline, the external leakage is zero, and the internal leakage meets the national standard.

2, pneumatic lining rubber

The connection methods are flanges, clamps, sealing lining butadiene rubber, ethylene propylene rubber, heat-resistant ethylene propylene rubber, natural rubber, chloroprene, fluorine rubber, polytetrafluoroethylene, according to chemical properties have a more reasonable choice.

3, pneumatic lining

The anti-corrosion fluorine lined butterfly valve adopts a body combination divided into two pieces, and the valve seat is integrated with the valve body lining. When the valve is working, only the fully formed seat and sleeve plate are in contact with the medium, and the product "removal of molten alkali metal and elemental fluorine" can withstand the corrosion of any medium.

4, pneumatic ventilation butterfly valve

There is a thin gap between the valve plate and the seat, suitable for environments with poor air circulation.