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Attention point of type selection of solenoid valve

2018-07-31
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The type selection of the solenoid valve should first follow the four principles of safety, reliability, applicability and economy, followed by the selection of the six aspects of the field conditions (i.e., pipe parameters, fluid parameters, pressure parameters, electrical parameters, mode of action, special requirements).
 
Selection basis:
 
1. Selection of solenoid valve according to pipe parameters: diameter specification (DN) and interface mode.
 
1) determine the diameter (DN) size according to the pipe diameter or flow requirement.
 
2) interface mode, general >DN50 to choose flange interface, less than DN50 can be freely selected according to user needs.
 
2. Selecting solenoid valves according to fluid parameters: material and temperature groups.
 
1) Corrosive fluids: corrosion-resistant solenoid valve and stainless steel should be selected; edible super-clean fluids: food-grade stainless steel solenoid valve should be selected;
 
2) High-temperature fluid: to choose the use of high-temperature electrical materials and sealing materials made of solenoid valves, and to choose the type of piston structure;
 
3) fluid state: large to gaseous, liquid or mixed, especially when the aperture is greater than DN25.
 
4) fluid viscosity: usually below 50cSt, you can choose anything. If it exceeds this value, high viscosity solenoid valve should be selected.
 
3. Selecting the solenoid valve according to the pressure parameter: principle and structure variety.
 
1) nominal pressure: this parameter is the same as that of other general valves, according to the nominal pressure of pipeline.
 
2) work pressure: if the work pressure is low, the principle of direct motion or step direct movement must be selected; the minimum working pressure difference is directly operated, the step direct movement and the pilot can be selected when the pressure difference is above 0.04Mpa.
 
4, electrical selection: voltage specifications should try to give priority to the selection of AC220V and DC24, which is more convenient.
 
5, according to the length of working hours to choose: normally closed, often open, or sustainable power.
 
1) when the solenoid valve needs to open for a long time, and the continuous time is longer than the closing time, the normally open type should be used.
 
2) if the opening time is short or the time of opening and closing is not enough, then the normally closed type is chosen.
 
3) However, in some cases for safety protection, such as furnace and kiln flame monitoring, it is not possible to choose the normal operation, should choose a long-term electrified type.
 
6, select auxiliary functions according to environmental requirements: explosion protection, check, manual, waterproof fog, water spray, diving.
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