Adjustable pressure pneumatic valve selection standards

, within a given level of spring pressure, the outlet pressure between the maximum and the minimum pressure pneumatic valve can adjust continuously, can not have jam and abnormal vibration;
, for soft seal vacuum pneumatic valve, within the prescribed period of time can not have leakage. For decompression of the metal sealing pneumatic valve, the leakage should be no greater than the maximum flow. %;
and outlet flow change, direct acting type of outlet pressure deviation is not more than %, guiding type is no more than %;
and inlet pressure change, direct acting type of outlet pressure deviation is no more than %, the forerunner of no more than %;
, usually adjustable pressure pneumatic valve pneumatic valve after pressure pneumatic valve should be less than before. Times;
and pressure pneumatic valve application range is very wide, in the industrial steam, compressed air, gas, water, oil, and many other liquid medium is applicable to equipment and piping, the medium flows through the amount of reduced pressure pneumatic valve outlet, usually expressed in mass flow rate or volumetric flow;
, corrugated pipe, direct acting pressure pneumatic valve is suitable for low voltage, small and medium caliber steam medium;
, film acting directly reduced pressure in the pneumatic valve is suitable for low pressure, medium and small size of air and water;
and pilot operated relief pneumatic valve is suitable for all kinds of pressure, all kinds of caliber, all kinds of medium temperature of steam, air and water, if use stainless acid-resistant steel manufacturing, can be applied to all kinds of corrosive medium.
, the forerunner of corrugated tube decompression pneumatic valve, suitable for low voltage, small and medium caliber media such as steam, air,
, the forerunner diaphragm pressure pneumatic valve, suitable for low pressure, medium pressure, small and medium caliber media such as steam or water;
and pressure pneumatic valve inlet pressure fluctuations should be controlled in inlet pressure given value % ~ %, such as more than the scope, the relief of performance will be affected;
and often reduced pressure of the pneumatic valve pneumatic valve after pressure pneumatic valve should be less than before. Times;
pneumatic valve, decompression of each leg spring applies only within a certain range of outlet pressure, beyond the scope of spring should be changed;
and work in the medium temperature is higher, generally choose the guide piston vacuum pneumatic valve or pilot bellows type vacuum pneumatic valve;
, medium for air or water, Liquid, general appropriate chooses direct acting diaphragm pressure pneumatic valve or pilot diaphragm pressure pneumatic valves;
, medium for steam, appropriate chooses the guide piston or pilot bellows type pressure pneumatic valves;
, convenient for operation, adjustment and maintenance, reduced pressure pneumatic valve should be installed in horizontal pipe runs.