Selection of solenoid valves

The selection of solenoid valves should first follow the four principles of safety, reliability, applicability, and economy, and secondly, based on six aspects of on-site working conditions (i.e., pipeline parameters, fluid parameters, pressure parameters, electrical parameters, action methods, Select according to special requirements).
Selection basis:
1. Select the solenoid valve according to the pipeline parameters: diameter specification (ie DN), interface mode
1) Determine the diameter (DN) size according to the on-site pipeline inner diameter size or flow requirements;
2) Interface mode, generally flange interface is selected for >DN50, and can be freely selected according to user needs for ≤DN50.
2. Select 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 a solenoid valve made of high-temperature resistant electrical materials and sealing materials, and choose a piston structure type;
3) Fluid state: ranging from gaseous, liquid or mixed state, especially when the diameter is larger than DN25, it must be distinguished;
4) Fluid viscosity: Usually it can be selected arbitrarily below 50cSt. If it exceeds this value, a high viscosity solenoid valve must be selected.
3. Select the solenoid valve according to the pressure parameters: principle and structural variety
1) Nominal pressure: This parameter has the same meaning as other general valves, and is determined based on the nominal pressure of the pipeline;
2) Working pressure: If the working pressure is low, the direct-acting or step-by-step direct-acting principle must be selected; when the minimum working pressure difference is above 0.04Mpa, direct-acting, step-by-step direct-acting, and pilot-operated types can be selected.
4. Electrical selection: It is more convenient to give priority to AC220V and DC24 for voltage specifications.
5. Choose according to the length of continuous working time: normally closed, normally open, or continuously powered on
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 long-term energized type should be selected.
6. Select auxiliary functions according to environmental requirements: explosion-proof, non-return, manual, waterproof fog, water spray, and diving.