Solenoid valve selection basis
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 mode, special requirements to choose).
Selection basis:
1. Select the solenoid valve according to the pipeline parameters: diameter specification (i.e. DN), interface mode
1) Determine the diameter (DN) according to the on-site pipeline inner diameter size or flow requirements Size;
2) Interface method, generally >DN50 requires flange interface, and ≤DN50 can be freely selected according to user needs.
2. Select the solenoid valve according to the fluid parameters: material, temperature group
1) Corrosive fluid: corrosion-resistant solenoid valve and all stainless steel should be selected;edible ultra-clean fluid: food-grade stainless steel solenoid valve should be selected;
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, they must be distinguished;
4) Fluid viscosity: usually below 50cSt, it can be selected arbitrarily. If it exceeds this value, a high-viscosity solenoid valve must be selected.
3. Selection of solenoid valves based on pressure parameters: principles and structural varieties
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 energized
1) When the solenoid valve needs to be open for a long time, and the duration is longer than the closed 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, in some working conditions for safety protection, such as furnace and kiln flame monitoring, it cannot be If you choose a normally open type, you should choose a type that can be powered on for a long time.
6. Select auxiliary functions according to environmental requirements: explosion-proof, non-return, manual, waterproof fog, water spray, and diving.
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