Working principle of pneumatic butterfly valve

The pneumatic butterfly valve uses the circular butterfly plate rotating with the valve as the opening and closing property, so as to realize the opening action of the pneumatic valve, which is mainly used as the block valve, and can also be designed to have the function of regulation or section valve and regulation At present, the butterfly valve is used more and more in the low-pressure large and medium caliber pipeline The main advantages of the butterfly valve are simple structure, small volume and light weight, low cost, especially the pneumatic butterfly valve, which is installed in the high-altitude tunnel, easy to operate through two position five-way solenoid valve control, and also can adjust the flow medium The fluid resistance is small, the effective flow area is large when the pneumatic disc valve with medium and large caliber is fully open, the opening and closing are quick and labor-saving, and the opening and closing can be completed when the disc wrench rotates 90 degrees Because the force of the disc wrench on both sides of the rotating shaft is nearly equal, the torque direction generated is opposite, so the opening and closing torque is small, and good sealing can be realized under low pressure The sealing materials of the disc valve are NBR and Viton, Edible rubber is lined with PTFE, so the sealing performance is good The hard sealing disc valve is soft and hard laminated metal plate, which has the important advantages of hard metal sealing and elastic sealing, and has excellent sealing performance no matter in low temperature The structure and working principle of butterfly valve are suitable for environment analysis The butterfly plate of butterfly valve is installed in the diameter direction of pipeline In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, with the rotation angle between 0 ° and 90 ° When it rotates to 90 °, the valve will be fully open Butterfly valve is simple in structure, small in volume and light in weight, and only consists of a few parts Moreover, the valve can be opened and closed quickly with only 90 ° rotation, and the operation is simple At the same time, the electric valve has good fluid control characteristics When the butterfly valve is in the fully open position, the butterfly plate thickness is the resistance of the medium flowing through the valve body, so the pressure drop generated by the valve is very small, so it has better flow control characteristics Butterfly valve has two types of seal: elastic seal and metal seal Elastic sealing valve, sealing ring can be inlaid on the valve body or attached to the periphery of butterfly plate The service life of the valve with metal seal is generally longer than that of the valve with elastic seal, but it is difficult to achieve complete seal The metal seal can adapt to the higher working temperature, while the elastic seal has the limitation of temperature If butterfly valve is required to be used as flow control, the main thing is to correctly select the size and type of valve The structure and principle of butterfly valve is especially suitable for making large-diameter valve Butterfly valve is not only widely used in petroleum, gas, chemical industry, water treatment and other general industries, but also in the cooling water system of thermal power station Butterfly valve - hard seal butterfly valve - wafer hard seal butterfly valve - flange hard seal butterfly valve - soft hard seal butterfly valve - manual butterfly valve - pneumatic butterfly valve - electric butterfly valve - ventilation butterfly valve - signal butterfly valve - Japanese standard butterfly valve - American standard butterfly valve - gate valve - stop valve - check valve