Reduced pressure pneumatic valve selection considerations

（ ） Steam pressure of the pneumatic valve pneumatic valve with pneumatic valve before the ratio of the absolute pressure should not be more than ~, when more than two series installation.
( ） When the pneumatic valve before and after the pneumatic valve differential pressure for ~ kg/cm, two by the pneumatic valve can be installed in tandem with the reduced pressure.
( ） Reduced pressure pneumatic valve product samples listed in the pneumatic valve hole area f value, generally refers to the largest cross-sectional area, actual circulation area will be less than this value, because the computing ( Or look up table) Of the pneumatic valve hole area choosing reduced pressure pneumatic valve, should leave room appropriately.
( ） When samples gave no pneumatic valve pneumatic valve hole area parameters, can according to the design flow rate first select pneumatic valve before and after the decompression pipe diameter, before the pneumatic valve pipe diameter selection of the same nominal diameter reduced pressure pneumatic valve.
( ） Choose steam, compressed air pressure pneumatic valve, besides indicating its type, specification, should also indicate the reduced pressure pneumatic valve pressure difference before and after the value and safety of pneumatic valve opening pressure, so that reasonable factory equipped with spring.