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Stainless steel check pneumatic valve selection of common sense
by：AIRWOLF
2020-10-15
Check according to the structure, pneumatic valve can be divided into pneumatic valve lift check, brigade and type check pneumatic valve, check valve.
Aerodynamic lift check valve can be divided into vertical and horizontal two kinds.
Swing check pneumatic valve is divided into single type, more than double disc type and disc type 3 kinds.
Check the pneumatic valve as straight through.
We usually choose again what to notice?
selection criteria:
1, in order to prevent medium counter-current, on the equipment, equipment and piping shall be installed stainless steel check pneumatic valve;
2, stainless steel check pneumatic valve is suitable for the cleaning medium commonly, should not be used in medium containing solid particles and viscosity is bigger;
3, usually on the level of nominal menstruation 50 mm pipe should be choose vertical lift check pneumatic valve;
4, cut-through lift check pneumatic valve can be installed in horizontal and vertical pipe.
5, 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;
6, 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;
7, 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;
8, swing check made small pneumatic valve, pneumatic valve should not be used as the high working pressure, PN can be up to 42 mpa, and DN also can do a lot, the maximum can reach more than 2000 mm. 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 196 - - Between 800 ℃;
9, suitable occasion is low pressure, large diameter, limits and installations;
10, type 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;
11, diaphragm type check pneumatic valve is suitable for easy 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 - 12 - - Between 120 ℃, pressure & lt; 1. 6 mpa, but type check pneumatic diaphragm valve can achieve large caliber, DN biggest can reach more than 2000 mm;
12, the form of a check in the pneumatic valve is suitable for the low pressure pipe, can be made into large diameter;
13, check the pneumatic valve shell material can be made of stainless steel, the seals of the hollow body can wrap teflon engineering plastic, so in general the pipeline corrosion medium can also be applied, in - operating temperature 101 - - Between 150 ℃, its nominal pressure of 4 or less. 0 mpa, nominal drift diameter range in 200 - 1200;
14, 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;
15, 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;
16, check the 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;
17, for high pressure under DN50mm check pneumatic valve, appropriate chooses vertical lift check pneumatic valve and straight-through lift check pneumatic valve;
18, for low pressure under DN50mm check pneumatic valve, appropriate chooses type check pneumatic valve, vertical lift check valves and diaphragm type check pneumatic valve;
19, for the DN is greater than 50 mm, less than 600 mm high pressure check pneumatic valve, appropriate chooses swing check pneumatic valve;
20, for DN is greater than 200 mm, less than 1200 mm in the low pressure check pneumatic valve, appropriate chooses no wear form check pneumatic valve;
21, for DN is greater than 50 mm, less than 2000 mm of low pressure pneumatic valve, check the chosen type check pneumatic valve and diaphragm type check pneumatic valve;
22, for closing water hammer impact is small or no water hammer pipe, appropriate chooses slow closed swing check the pneumatic valve gently closed form of a check pneumatic valve.
selection criteria:
1, in order to prevent medium counter-current, on the equipment, equipment and piping shall be installed stainless steel check pneumatic valve;
2, stainless steel check pneumatic valve is suitable for the cleaning medium commonly, should not be used in medium containing solid particles and viscosity is bigger;
3, usually on the level of nominal menstruation 50 mm pipe should be choose vertical lift check pneumatic valve;
4, cut-through lift check pneumatic valve can be installed in horizontal and vertical pipe.
5, 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;
6, 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;
7, 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;
8, swing check made small pneumatic valve, pneumatic valve should not be used as the high working pressure, PN can be up to 42 mpa, and DN also can do a lot, the maximum can reach more than 2000 mm. 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 196 - - Between 800 ℃;
9, suitable occasion is low pressure, large diameter, limits and installations;
10, type 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;
11, diaphragm type check pneumatic valve is suitable for easy 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 - 12 - - Between 120 ℃, pressure & lt; 1. 6 mpa, but type check pneumatic diaphragm valve can achieve large caliber, DN biggest can reach more than 2000 mm;
12, the form of a check in the pneumatic valve is suitable for the low pressure pipe, can be made into large diameter;
13, check the pneumatic valve shell material can be made of stainless steel, the seals of the hollow body can wrap teflon engineering plastic, so in general the pipeline corrosion medium can also be applied, in - operating temperature 101 - - Between 150 ℃, its nominal pressure of 4 or less. 0 mpa, nominal drift diameter range in 200 - 1200;
14, 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;
15, 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;
16, check the 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;
17, for high pressure under DN50mm check pneumatic valve, appropriate chooses vertical lift check pneumatic valve and straight-through lift check pneumatic valve;
18, for low pressure under DN50mm check pneumatic valve, appropriate chooses type check pneumatic valve, vertical lift check valves and diaphragm type check pneumatic valve;
19, for the DN is greater than 50 mm, less than 600 mm high pressure check pneumatic valve, appropriate chooses swing check pneumatic valve;
20, for DN is greater than 200 mm, less than 1200 mm in the low pressure check pneumatic valve, appropriate chooses no wear form check pneumatic valve;
21, for DN is greater than 50 mm, less than 2000 mm of low pressure pneumatic valve, check the chosen type check pneumatic valve and diaphragm type check pneumatic valve;
22, for closing water hammer impact is small or no water hammer pipe, appropriate chooses slow closed swing check the pneumatic valve gently closed form of a check pneumatic valve.
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