Selection Basis Of Solenoid Valve
1. Select the solenoid valve according to the pipeline parameters: diameter specification (namely DN), interface mode
1) Determine the diameter (DN) size according to the pipe inner diameter size or flow requirements on site;
2) Interface mode, generally >DN50 should choose flange interface, ≤DN50 can be freely selected according to user needs.
2. Choose the solenoid valve according to the fluid parameters: material, temperature group
1) Corrosive fluids: Corrosion-resistant solenoid valves and all stainless steel should be used; edible ultra-clean fluids: Food-grade stainless steel solenoid valves should be used;
2) High temperature fluid: choose solenoid valves made of high temperature resistant electrical materials and sealing materials, and choose a piston type structure;
3) Fluid state: large to gaseous, liquid or mixed state, especially when the diameter is larger than DN25, it must be distinguished;
4) Fluid viscosity: usually below 50cSt, it can be arbitrarily selected. If it exceeds this value, a high-viscosity solenoid valve should be used.
3. Choose solenoid valve according to pressure parameters: principle and structure variety
1) Nominal pressure: This parameter has the same meaning as other general valves, and it is determined according to the nominal pressure of the pipeline;
2) Working pressure: If the working pressure is low, the principle of direct action or stepwise direct action must be used; when the minimum working pressure difference is above 0.04Mpa, direct action, stepwise direct action, and pilot type can be selected.
4. Electrical selection: It is more convenient to choose AC220V and DC24 for voltage specifications as much as possible.
5. Choose according to the length of continuous working time: normally closed, normally open, or continuously energized
1) When the solenoid valve needs to be opened for a long time, and the duration is longer than the closing time, the normally open type should be selected;
2) If the opening time is short or the opening and closing time is not long, choose the normally closed type;
3) However, for some working conditions used for safety protection, such as furnace and kiln flame monitoring, the normally open type cannot be selected, and the type that can be energized for a long time should be selected.
6. Select auxiliary functions according to environmental requirements: explosion-proof, non-return, manual, waterproof, mist, water shower, and diving.
