Check the pneumatic valve selection criteria

check pneumatic valve type selection standard content is as follows:
, in order to prevent medium counter-current, in equipment, devices, and check the pneumatic valve should be installed in the pipeline;
and check pneumatic valve is suitable for the cleaning medium commonly, should not be used in medium containing solid particles and viscosity is bigger;
, typically on the level of nominal menstruation mm pipe should choose vertical lift check pneumatic valve;
, cut-through lift check pneumatic valve can be installed in horizontal and vertical pipe.
, for import pipeline pumps, appropriate chooses hand valve, hand move valve installed in the pump only commonly imported vertical pipe runs, and the medium flows from bottom to top;
, elevating the swing sealing good, fluid resistance is big, horizontal should be installed in horizontal pipe runs with the vertical installed in vertical pipe runs;
and swing check pneumatic valve installation position is not restricted, and it can be installed in a horizontal, vertical or inclined line, such as in a vertical pipe runs, the medium flows from bottom up;
and swing check made small pneumatic valve, pneumatic valve should not be used as the high working pressure, the PN can achieve MPa, and DN also can do a lot, the biggest can achieve mm above. According to the shell and packing material can be applied to any working medium and any working temperature range. Medium for water, steam, gas, corrosive medium, oil, medicine, etc. Medium in - working temperature range - - Between ℃;
, suitable occasion is low pressure, large diameter, limits and installations;
, butterfly check pneumatic valve installation position is not restricted, and can be installed in a horizontal pipe road, also can be installed in vertical or inclined line;
check pneumatic valve, diaphragm type applies to easily produce water hammer on the pipeline, the diaphragm is a good way to eliminate water hammer produced by a dielectric upstream, it is generally used in low pressure pipe at room temperature, especially suitable for the water pipe, the working temperature in a normal medium - - - ℃, between work pressure & lt; 。 MPa, but diaphragm type check pneumatic valve can achieve large caliber, DN biggest can reach above mm;
in pneumatic valve, ball check is suitable for the low pressure pipe, can be made into large diameter;
pneumatic valve, ball check shell material can be made of stainless steel, the seals of the hollow spheres can package ptfe engineering plastics, so in general the pipeline corrosion medium can also be applied, in - operating temperature - - Between ℃, its nominal pressure or less. MPa, nominal drift diameter range in - Between;
, for non-compressible fluid with pneumatic valve when the choice must first check to evaluate need closing speed, the second step is to choose the closing speed could meet the need of the check of the pneumatic valve type;
, for compressible fluid with check pneumatic valve when the choice according to non-compressible fluid using similar methods to choose check pneumatic valve, if the medium flow field is very large, used for compressible fluid check pneumatic valve can use a speed reducer, if the medium flow continuous period of not to stop and start quickly, as the export of compressor, the use of aerodynamic lift check valve;
and check pneumatic valve shall determine the size of the response, pneumatic valve supplier must provide the size of the selected data, so you can find under a given flow pneumatic valve fully open the pneumatic valve size;
, for high pressure under DNmm check pneumatic valve, appropriate chooses vertical lift check pneumatic valve and straight-through lift check pneumatic valve;
, for low pressure under DNmm check pneumatic valve, pneumatic valve, appropriate chooses butterfly check vertical lift check pneumatic valve and diaphragm type check pneumatic valve;
, for DN mm, shorter than mm high pressure check pneumatic valve, appropriate chooses swing check pneumatic valve;
, for low pressure in the DN mm, shorter than mm check pneumatic valve, appropriate chooses no wear ball check pneumatic valve;
, for DN mm, shorter than mm low pressure check pneumatic valve, butterfly check pneumatic valve is used in the Iraq and diaphragm type check pneumatic valve;
, for closing water hammer impact is small or no water hammer pipe, appropriate chooses slow gentle closed closed swing check pneumatic valve butterfly check pneumatic valve.