Selection of gas solenoid gas valve selection should be based on site conditions: pipe parameters, fluid parameters, pressure parameters, electrical parameters, action modes, special requirements to choose.
First, according to the pipeline parameters to select the solenoid valve: Path size (ie, DN), interface mode
1. Determine the diameter (DN) size according to the pipe diameter or flow requirements.
2, interface, general> DN50 to choose the flange interface, ≤ DN50 can be free to choose according to user needs.
Second, according to the fluid parameters to select the solenoid valve: material, temperature group
1, corrosive fluids: should use corrosion-resistant solenoid valve and stainless steel; consumption of ultra-clean fluid: should use food grade stainless steel solenoid valve.
2, high-temperature fluid: to choose high-temperature electrical materials and sealing materials made of electromagnetic valve, but also to choose the type of piston structure.
3, the fluid state: large to have gaseous, liquid or mixed state, especially the diameter is greater than DN25.
4, fluid viscosity: usually below 50cSt can be arbitrarily selected, if more than this value, you have to use high-viscosity solenoid valve.
Third, according to the pressure parameter selection solenoid valve of the principle and structure of varieties
1, Nominal pressure: This parameter and the meaning of other common valve is the same, according to the pipeline to determine the nominal pressure.
2, the working pressure: If the working pressure is low, you must use direct-acting or step-by-step direct-acting principle; minimum operating pressure of 0.04Mpa above the direct-acting, step-by-step type, pilot-type can be used.
Fourth, the electrical selection: voltage specifications should be preferred AC220V, DC24 more convenient.
5, according to the duration of the duration of work to choose: normally closed, normally open, or sustainable power
1, when the solenoid valve needs a long time to open, and the duration of time should be used to close the open normally open type.
2, if the opening time is short or on and off time is not much time, the election normally closed type.
3, but some of the conditions for the safety protection, such as furnace, kiln flame monitoring, you can not choose normally open, should be elected long-term power-type.
6, according to environmental requirements to select auxiliary functions: explosion-proof, back only, manual, waterproof fog, water shower, diving
1, the explosive environment: the explosion must be selected the appropriate level of solenoid valve.
2, when the tube has the phenomenon of backflow of fluid, the valve can be selected with a non-return function.
3, when the need for on-site manual operation of the solenoid valve, the solenoid valve can be selected with manual function.
4, open-air installation or dusty occasions should be used waterproof, dust-proof varieties (protection class in IP54 or more).
5, the fountain must be used for submersible solenoid valve (protection class IP54 or more).