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The main advantages of the pneumatic butterfly valve, simple structure, small weight and light, low cost, the characteristics of the pneumatic butterfly valve is particularly significant, installed in the high altitude underpass, after two five-way solenoid valve control operation is convenient, but also adjustable flow medium.Fluid resistance is small, large diameter pneumatic butterfly valve fully open and effective circulation area is larger, easy opening and closing fast, disc pull rotation Angle of 90 to complete opening and closing, due to the rotation axis disc hand medium force nearly equal, and the torque in the opposite direction, thus opening and closing torque is small, low pressure can achieve good sealing, butterfly valve sealing material is nitrile butadiene rubber, fluorine rubber, rubber, four fluorine lining so sealed performance is good, which is suitable for soft hard cascading metal hard seal butterfly valves with metal sealing and elastic sealing heavy advantage, no matter under the condition of low temperature all have good sealing performance.

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