selection on the basis of: a, according to the fluid parameter selection of the electromagnetic valve: group 1 material, temperature, corrosive fluid, appropriate chooses corrosion-resistant solenoid valve and all stainless steel; Super clean fluid: appropriate chooses food grade stainless steel solenoid Industrial Valves. 2, high temperature fluid: should choose to use high temperature resistant of electrical solenoid valve materials and seal materials, and to choose the piston structure type. 3, fluid state: to have a gaseous, liquid or mixed state, especially the diameter greater than DN25 must distinguish when you order it. 4, fluid viscosity, usually under 50 CST can be arbitrary choice, if more than this value, should choose high viscosity solenoid valve. Second, according to the selection of pipe parameters of electromagnetic valve: size specifications ( The DN) , 1 interface mode, in accordance with the piping or flow required to determine the size (diameter DN) Size. 2, the interface way, general > (choose the flange interface, & le; (can according to user needs freedom of choice. Three, electrical options: voltage specifications should be preferred as far as possible choose AC220V, DC24 is more convenient. Four, according to the parameter selection pressure solenoid valve: principle and structure of the varieties, nominal pressure 1: the meaning of this parameter with other general Industrial Valves is the same, is set according to the pipe nominal pressure. 2, working pressure: if low working pressure must choose or step by step of moving straight acting principle; The minimum working pressure difference at 0. More than 4 mpa straight acting, step by step straight acting, guiding type all can choose. Five, according to the environmental requirements to choose auxiliary function: explosion-proof, check, manual, waterproof, water spray, fog diving 1, explosive environment, must choose corresponding explosion-proof grade of solenoid valve ( My company's existing: d II BT4, d CT5 II, Ex m I/II T4) 。 2, when tube fluid backflow phenomenon, can choose OK71 - my company N、OK72- N series electromagnetic valve with the function of the check. 3, when you need to conduct site manual operation of solenoid valve, can choose OK71 - my company S、OK72- S series solenoid valve with manual function. 4, open-air installation or dust should choose more occasions waterproof, dust-proof varieties ( Degree of protection IP54 or more) 。 5, must be used for fountain diving type solenoid valve ( In IP68 protection grade or above) 。 Six, according to the length of continuous working time to choose: normally closed, normally open, sustainable electricity or 1, if you open the short time or a little while, and off time is normally closed type chosen. 2, but some conditions for security protection, such as a furnace, furnace flame monitoring, cannot choose normally open, choose the long-term operation. (

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