Do you know the selection of solenoid valve

Do you know the selection of solenoid valve

The selection of solenoid valve should first follow the four principles of safety, reliability, applicability, and economy in order, based on the four principles, and secondly, according to the six aspects of field working conditions (i.e. pipeline parameters, fluid parameters, Select pressure parameters, electrical parameters, action modes, and special requirements) to make the next selection judgment. Here are six selection criteria.

　　 One. Choose solenoid valve according to 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

　　 1. Corrosive fluid: Corrosion-resistant solenoid valve and all stainless steel should be used; edible ultra-clean fluid: Food-grade stainless steel solenoid valve 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: large to gaseous, 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.

　　 Three, 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 z*low working pressure difference is above 0.04Mpa, direct action, stepwise direct action and pilot can be selected.

　　 4. Electrical selection: AC220V and DC24 should be preferred 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 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.

　　 Six. 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 grade must be selected.

　　2. When the fluid in the pipe has backflow phenomenon, you can choose OK71-N, OK72-N series solenoid valve with check function.

　　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. Submersible solenoid valves must be used for fountains (protection level above IP68).

　　 5. Waterproof and dustproof varieties should be selected for outdoor installation or dusty occasions (protection level above IP54).