The essentials of 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 (namely, pipeline parameters, fluid parameters, pressure parameters, electrical parameters, action methods, Special requirements for selection). Selection basis: 1. Solenoid valve selection based on pipeline parameters: diameter specification (namely DN) and connection method solenoid valve selection should first follow the four principles of safety, reliability, applicability, and economy in order, and secondly based on Six aspects of on-site working conditions (namely, pipeline parameters, fluid parameters, pressure parameters, electrical parameters, action modes, special requirements for selection). Selection basis: 1. Select the solenoid valve according to the pipeline parameters: diameter specification (namely DN), interface method 1. Determine the diameter (DN) size according to the on-site pipeline inner diameter or flow requirements. 2. Interface mode, generally >DN50 should choose flange interface, ≤DN50 can be freely selected according to user needs. 2. Select the solenoid valve according to the fluid parameters: material and 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 solenoid valves made of high temperature resistant electrical materials and sealing materials, and choose a piston type structure. 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. 3. Select the solenoid valve according to the pressure parameter: principle and structure variety 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. 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 continuous time is excessive, 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. 6. 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 (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).