Pneumatic butterfly valve What is a pneumatic butterfly valve?
Answer: Pneumatic butterfly valve Pneumatic butterfly valve is mainly used to suppress the shock and impact from the road surface when the ball valve rebounds after shock absorption. Although the shock absorption ball valve can filter the shock of the road surface when passing through the uneven road surface, the ball valve itself will have reciprocating motion, and the valve actuator is used to restrain the jump of the ball valve. If the pneumatic butterfly valve is too soft, the body will jump up and down. If the pneumatic butterfly valve is too hard, it will bring too much resistance, preventing the normal operation of the ball valve. During the modification of the suspension system, the hard pneumatic butterfly valve should be matched with the hard ball valve, and the hardness of the ball valve is closely related to the vehicle weight, so the heavier vehicles generally use the hard pneumatic butterfly valve. The device connected with the shock inducing crankshaft is used to counter the torsional shock of the crankshaft (that is, the crankshaft is twisted by the impact of cylinder ignition). Pneumatic butterfly valve is an inflatable ball valve that is filled with pressure air in a flexible closed container and uses the compressibility of air to achieve elastic effect, so it has high requirements for air tightness. Pneumatic butterfly valves are generally sealed by screw fastening and pressure self sealing. The former uses screws to fasten the metal retaining ring, capsule sealing part and upper cover plate together for sealing; The latter uses the air pressure inside the capsule to compress the sealing surface of the capsule and the cover plate to seal. Because the pressure self sealing structure has the advantages of small size, light weight, convenient installation, etc., the 25T passenger car bogie widely uses this sealed pneumatic butterfly valve. The pneumatic butterfly valve system of 25T passenger car bogie is mainly composed of pneumatic butterfly valve, height control valve, differential pressure valve and additional air chamber.
The height control valve is an important part of the pneumatic butterfly valve system. It is mainly used to automatically adjust the air pressure in the pneumatic butterfly valve to adapt to it when the vehicle load changes, so as to maintain the height of the vehicle body unchanged. The differential pressure valve is mainly used to ensure safety. When the pressure difference between the pneumatic butterfly valves on both sides of a bogie is large, or the ball valve on one side is broken, the differential pressure valve automatically communicates with the pneumatic butterfly valves on the left and right sides to avoid excessive inclination of the car body and derailment, so as to ensure stable and safe operation of the vehicle. Air leakage of pneumatic butterfly valve may occur during operation due to climate conditions, line conditions (especially small radius curve), components of pneumatic butterfly valve system, quality of pneumatic butterfly valve itself and other comprehensive factors.