Two minutes to let you know the cast steel by the pneumatic valve

as pneumatic valve, pneumatic valve is also called door belongs to compulsory sealed pneumatic valve, in pneumatic valve is closed, so must to pressure pneumatic disc, to force a sealing surface does not leak. When medium by pneumatic disc below into the pneumatic valve, operating force required to overcome resistance, pneumatic stem and packing of the friction force is produced by medium pressure and thrust, close the pneumatic valve force than the pneumatic valves open force is big, so the larger the diameter of the pneumatic valve stem, or pneumatic stem top bending failure happens. According to the connection mode is divided into three types: flange connection, threaded connection, welding connection. From the seal of the pneumatic valve, the flow direction of medium by the pneumatic valve is replaced by air above the disc into the pneumatic valve cavity, in medium pressure at this moment, close the pneumatic valve is small, the force and the great strength of pneumatic valve, pneumatic valve stem diameter can be reduced accordingly. At the same time, in the role of media, this kind of pneumatic valve is tight. Pneumatic valve in China 'three for' regulation, by the flow of the pneumatic valve shall be applied. As the pneumatic valve opens, pneumatic valve opening, % ~ % for nominal diameter. Traffic has reached maximum, said pneumatic valve has reached its full open position. So by the pneumatic valve fully open position, should be determined by pneumatic disc trip.