Solenoid valve selection should first turn to follow the security, reliability, applicability, and economy of the four original solenoid valve 
 , Followed by the six aspects of site conditions (ie, the pipeline parameters, fluid parameters, pressure parameters, electrical parameters, action, special requirements to choose). Selection basis: one based on pipeline parameters to select electromagnetic valve: Path specification (DN) of the interface mode, according to the field pipe diameter size or flow requirements to determine the size of the diameter (DN). 2, interface mode, general> of DN50 To select the flange interface, ≤ of DN50 can be free to choose according to user needs. Second, selected based on the fluid parameters to select electromagnetic valve: material, temperature, group 1, corrosive fluids: should be corrosion-resistant solenoid valves and stainless steel; eating superclean Fluid: should use food grade stainless steel solenoid valve. 2, high-temperature fluids: To select a high-temperature electrical materials and sealing materials, electromagnetic valve, but also to select the piston structure type. Solenoid valve 
 3, fluid status: gaseous, liquid or mixed state, in particular, is a diameter greater than DN25 order must separate. 4, the fluid viscosity: usually 50cSt the following arbitrary choice than this value will have to use the solenoid valve of the high viscosity. The pressure parameter selection solenoid valve: principles and structure of species 1, the nominal pressure: the meaning of this parameter with other Universal Valve, pipe nominal pressure. Working pressure: if the low pressure must be selected direct action or step-by-step principle of direct action; minimum working pressure is acting the 0.04Mpa more than straight, step-by-step direct-acting, the pilot can be selected. Electrical options: voltage specification should be preferred AC220V, DC24 is more convenient. To select, according to the length of continuous working time: normally closed, normally open, or power a sustainable, take a long time to open when the solenoid valve, and the duration of the excess off time to be elected to the solenoid valve 
 Normally open type. 2, I opened a short time or on and off time is running out, then select normally closed type. 3, but some conditions for security protection, such as furnaces, kilns, flame monitoring, you can not select normally open, to be elected to the long-term power type. 6, according to environmental requirements, the choice of auxiliary functions: explosion-proof, non-return, manual, water fog, water washout, diving 
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