Solenoid Valve Selection and Precautions
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 field working conditions (ie pipeline parameters, fluid parameters, pressure parameters, electrical parameters, action methods, Special requirements for selection).
The main advantages of solenoid valves are small size, reliable action, convenient maintenance and low price. When choosing, you need to pay attention to choosing the normally open or normally closed type according to the process requirements.
Selection basis:
- Choose 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.
- Choose the solenoid valve according to the fluid parameters: material and temperature
1). Corrosive fluid: Corrosion-resistant solenoid valve and all stainless steel should be used; Super-clean edible fluid: Food-grade stainless steel solenoid valve 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 gas, liquid or mixed state, especially if the diameter is larger than DN25, it must be distinguished when ordering.
4). Fluid viscosity: usually below 50cSt, it can be arbitrarily selected. If it exceeds this value, a high-viscosity solenoid valve should be used.
- Choose solenoid valve according to pressure parameters: principle and structure
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.
- Electrical selection: It is more convenient to choose AC220V and DC24 for voltage specifications.
- 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 lasting time exceeds 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 power-on type should be selected.
- 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 levels must be selected.
2). When the fluid in the pipe has backflow phenomenon, OK71-N, OK72-N series solenoid valves with check function can be selected.
3). When the solenoid valve needs to be operated manually on site, the OK71-S and OK72-S series solenoid valves with manual functions can be selected.
4). For fountains, submersible solenoid valves must be used (protection level above IP68).
5). Waterproof and dustproof varieties should be selected for outdoor installation or dusty occasions (protection level above IP54).
Precautions for solenoid valve selection
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 field working conditions (ie pipeline parameters, fluid parameters, pressure parameters, electrical parameters, action methods, Special requirements for selection).
Select the solenoid valve according to the pipeline parameters: diameter specification (namely DN), interface mode;
Select the solenoid valve according to the fluid parameters: material, temperature group
Choose solenoid valve according to pressure parameters: principle and structure variety
Electrical selection: AC220V and DC24 should be preferred for voltage specifications as much as possible.
Choose according to the length of continuous working time: normally closed, normally open, or continuously energized
Select auxiliary functions according to environmental requirements: explosion-proof, non-return, manual, waterproof mist, water shower, diving
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