Wafer check valve pneumatic valve installation steps and the selection of the key

installation notice:
, installation position and height, import and export direction must comply with the design requirements, pay attention to the medium flow direction should be consistent with the pneumatic valve body the direction of the arrow, the connection should be firmly connected.
a visual inspection must be conducted before installation, pneumatic valve, pneumatic valve nameplate shall comply with the current national standard 'general pneumatic valve symbol' GB regulation. Pressure is greater than for the job. MPa and pneumatic valve with the function of cutting on ZhuGanGuan, strength and strict performance test should be done before the installation, qualified rear must use. Strength test, the test pressure for the nominal pressure. Times, duration of not less than min, pneumatic valve shell, packing should be no leakage as qualified. Leak test, the test pressure for the nominal pressure. Times; The duration of the test in line with the requirements of GB.
, do not make check pneumatic valve in the line to bear weight, large check pneumatic valve ( aetv一 Way valve: support should be independent, not affected by the pressure caused by the piping. Selection is the key to
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, generally recommend that users choose pneumatic valve, metal hard seal clamp check to ensure that the wafer check the service life of pneumatic valve has a higher and higher temperature, and also has good sealing performance;
and nominal size greater than or equal to the DN ( The NPS to choose H double disc swing check pneumatic valve as appropriate to the clamp, which can effectively reduce the loss of fluid resistance to check pneumatic valve, Nominal size less than or equal to the DN ( The NPS to choose H aerodynamic lift check valve as appropriate;
and nominal size less than or equal to the DN ( NPS H lift to clamp check pneumatic valve because of its compact structure, and considering the processing and manufacturing process, generally does not produce carbon steel check pneumatic valve, suggest the user to choose stainless steel lift check pneumatic valve to the clamp;
and lug wafer check valve pneumatic valve has the following several kinds of structure, if the user does not have special requirements, structure generally made by the company according to the
, partial double pneumatic valve swing check valve can use double flange structure design ( H;
and lugs on pneumatic valve, double valve swing check valve function positioning lugs flange only, lugs don't inherit the bolt force, so the lugs of the thickness of the flange is not in accordance with the standard flange thickness design, usually lugs flange thickness less than standard flange thickness. And the double flange connection double disc swing check pneumatic valve flange bolt under force, the flange thickness, according to the standard of the flange design;
, nominal pressure PN and PN and PN and PN lift check pneumatic valve has two kinds of structure to the clamp the length of the series. With short series check pneumatic valve price is low, but check the pneumatic valve and pipe flange connection may need to use non-standard gasket, if the long series pneumatic valves, check can make standard flange gasket