The selection of pneumatic valves - — The selection of pneumatic valve automatically

choose pneumatic valves must first know the performance of the medium, flow characteristic, and properties, such as temperature, pressure, flow velocity, flow rate, and then, combined with the technology, operation and safety factors, the corresponding type, structure, model specifications of the pneumatic valve. Automatic pneumatic automatic selection of pneumatic valve and valve selection of general pneumatic valve, besides should consider economic rationality, durable, also requires automatic pneumatic valve performance, reliable and accurate adjustment. Check the selection of pneumatic valve check pneumatic valve's role is only allowed to medium flows in one direction, the direction and stop the flow. The commonly used check pneumatic valve lift and swing two ( See figure - ~ figure - 。 In high pressure and small equipment or piping, usually choose aerodynamic lift check valve. For smaller pressure drop, unfavorable choose aerodynamic lift check valve, with their large flow resistance, and should choose butterfly check pneumatic valve and swing check valve. In a line pressure fluctuations and have special requirements, in order to prevent damage to the, pneumatic disc from water hammer should choose a buffer device swing check pneumatic valve. When large caliber, choose more disc swing check pneumatic valve. In the boiler feed water pump outlet, should choose a dedicated empty row check pneumatic valve, in order to prevent the backflow medium, improve the efficiency of the pump. Used to valve pump suction pipe bottom spirit. Common swing check pneumatic valve and lift check valve should try to avoid diameter is too large. In order to make check with minimum flow pneumatic valve fully open or drive to the right position, used in some cases, the installation check the calibre of the pneumatic valve must be smaller than the corresponding pipe diameter. In order to meet the needs of a variety of purposes, check the pneumatic valve is varied, such as: ball check pneumatic valve, screw lift stop check pneumatic valve, no impact on the work of swing check pneumatic valve, pneumatic valve, Angle valve check cone type check pneumatic diaphragm valve, etc. According to different medium, the pneumatic valve disc can be made of metal and can also be embedded in the metal, leather, rubber, or synthetic coverage, thermal spraying other alloy materials.