The selection of solenoid valve is based on the detailed explanation. The selection of
solenoid valve should first follow the four principles of safety, reliability, applicability, and economy in order, and then according to the six aspects of on-site working conditions (ie pipeline parameters, fluid parameters, pressure Parameters, electrical parameters, action modes, special requirements for selection).
Selection basis:
1. Solenoid valve selection according to fluid parameters: temperature group, material
1, fluid state: as large as gas, liquid or mixed state, especially if the diameter is larger than DN25, it must be distinguished when ordering.
2. Fluid viscosity: usually below 50cSt, it can be arbitrarily selected. If it exceeds this value, a high-viscosity solenoid valve should be used.
3. 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.
4. High-temperature fluid: Choose solenoid valves made of high-temperature resistant electrical materials and sealing materials, and choose a piston type structure.
2. Select the solenoid valve according to the pipeline parameters: diameter specification (namely DN), interface method
1, interface method, generally> DN50 to choose flange interface, ≤ DN50 can be freely selected according to user needs.
2. Determine the diameter (DN) size according to the pipe inner diameter size or flow requirements on site.
3. Electrical selection: It is more convenient to choose AC220V and DC24 for voltage specifications as much as possible.
Fourth, select solenoid valve according to pressure parameters: principle and structure variety
1. Working pressure: If the working pressure is low, you must choose the direct-acting or step-by-step direct-acting principle; when the minimum working pressure difference is above 0.04Mpa, the direct-acting, sub-type Both direct-acting and pilot-acting types can be selected.
2. Nominal pressure: This parameter has the same meaning as other general valves, and it is determined according to the nominal pressure of the pipeline.
5. Select auxiliary functions according to environmental requirements: explosion-proof, non-return, manual, waterproof, mist, water shower, diving
1. Explosive environment: solenoid valves with corresponding explosion-proof grades must be selected (our company’s existing: d II BT4, d II CT5, Ex m I/II T4).
2. When the fluid in the pipe has backflow phenomenon, you can choose our company’s OK71-N, OK72-N series solenoid valves with check function.
3. When the solenoid valve needs to be operated manually on site, you can choose our company’s OK71-S, OK72-S series solenoid valves with manual functions.
4. Waterproof and dustproof varieties should be selected for outdoor installation or dusty occasions (protection level above IP54).
5. Submersible solenoid valves must be used for fountains (protection level above IP68).
6. Choose according to the length of continuous working time: normally open, normally closed, or continuously energized
1. However, for some working conditions used for safety protection, such as furnace and kiln flame monitoring, normally open cannot be selected, but long-term Power-on type.
2. If the opening time is short or the opening and closing time is not long, choose the normally closed type.