Solenoid valve selection should first follow the four original principles of safety, reliability, applicability and economy in turn, followed by the selection of six field conditions (namely pipeline parameters, fluid parameters, pressure parameters, electrical parameters, action mode and special requirements).
Selection basis:
1, according to the pipeline parameters, select the solenoid valve: diameter specification (namely DN), interface mode
1) Determine the diameter (DN) size according to the internal diameter size or flow requirements of the field pipeline;
2) Interface mode, generally >DN50 to choose flange interface, ≤DN50 can be free to choose according to user needs.
2, according to the fluid parameters to select the solenoid valve: material, temperature group
1) Corrosive fluids: corrosion-resistant solenoid valves and stainless steel should be selected; Food ultra-clean fluid: 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 manufactured solenoid valve, but also to choose the type of piston structure;
3) Fluid state: large to gaseous, liquid or mixed state, especially when the caliber is greater than DN25 must be distinguished;
4) Fluid viscosity: usually below 50cSt can be arbitrarily selected, if more than this value, to choose high viscosity solenoid valve.
3, according to the pressure parameters to select the solenoid valve: principle and structural varieties
1) Nominal pressure: This parameter has the same meaning as other general valves, which is determined according to the nominal pressure of the pipeline;
2) Working pressure: if the working pressure is low, direct action or step by step principle must be selected; When the minimum working pressure difference is above 0.04Mpa, direct acting type, step by step direct acting type, pilot type can be selected.
4. Electrical selection: AC220V and DC24 should be preferred as far as possible for voltage specifications.
5, according to the length of continuous working time to choose: normally closed, normally open, or sustainable power
1) When the solenoid valve needs to be opened for a long time, and the duration of time is more than the closing time should be selected with normally open type;
2) If the opening time is short or the opening and closing time is not much, then choose normally closed type;
3) But some working conditions for safety protection, such as furnace and kiln flame monitoring, can not be selected normally open, should be selected for a long time power type.
6, according to the environmental requirements to choose auxiliary functions: explosion-proof, check, manual, waterproof fog, water shower, diving.
