The main advantages of the butterfly valve are simple structure, small size and light weight, and low cost. The pneumatic butterfly valve is particularly prominent. It is installed in the high air tunnel, and is easy to operate through the control of the two position five way solenoid valve, and can also adjust the flow medium. The fluid resistance is small, the effective flow area is large when the pneumatic butterfly valve with medium and large diameters is fully opened, and the opening and closing is fast and labor-saving. The disc wrench can complete the opening and closing by rotating 90 degrees. Since the force of the disc wrench medium 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 achieved under low pressure. The sealing materials of the butterfly valve include nitrile rubber and fluororubber, The edible rubber is lined with tetrafluoroethylene, so the sealing performance is good. The hard sealing butterfly valve is a soft and hard laminated metal plate, which has the heavy advantages of hard metal sealing and elastic sealing. It has excellent sealing performance no matter at low temperature?

The valve is the control part in the pipeline fluid transmission system, which is used to change the channel section and the medium flow direction, and has the functions of diversion, cut-off, adjustment, throttling, check, diversion or overflow pressure relief. The valves used for fluid control range from the simple shut-off valve of Zui to various valves used in extremely complex automatic control systems, with a wide range of varieties and specifications. The nominal diameter of the valves ranges from very small instrument valves to industrial pipeline valves with a diameter of 10m. The valve can be used to control the flow of water, steam, oil, gas, mud, various corrosive media, liquid metal, radioactive fluid and other types of fluids. The working pressure of the valve can be from 0.0013MPa to 1000MPa with ultra-high pressure, and the working temperature can be from - 269 ℃ to 1430 ℃ with ultra-low temperature. The valve can be controlled by various transmission modes, such as manual, pneumatic, hydraulic, pneumatic, worm gear, electromagnetic, electro-hydraulic, electro-hydraulic, pneumatic, spur gear, bevel gear, etc; Under the action of pressure, temperature or other forms of sensing signals, the valve can act according to the predetermined requirements, or simply open or close without relying on the sensing signals. The valve relies on the drive or automatic mechanism to make the opening and closing parts move up and down, slip, swing or rotate, thus changing the size of its flow channel area to achieve its control function.