Selection basis of explosion proof solenoid valve
1. Selecting 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 is determined according to the nominal pressure of the pipeline.
2) Work pressure: If the work pressure is low, the direct or step-by-step principle must be chosen; when the minimum working pressure difference is above 0.04 Mpa, the direct, step-by-step and pilot type can be used.
2, electrical selection: voltage specifications should try to give priority to the selection of AC220V and DC24, which is more convenient.
3, according to the length of working hours to choose: normally closed, often open, or sustainable power.
1) When the solenoid valve needs to be opened for a long time and lasts longer than the closing time, the normal open type should be chosen.
2) if the opening time is short or the time of opening and closing is not enough, then the normally closed type is chosen.
3) However, some working conditions used for safety protection, such as furnace and kiln flame monitoring, can not be open regularly, so long-term power-on type should be selected.
4, select auxiliary functions according to environmental requirements: explosion protection, check, manual, waterproof fog, water spray, diving. Selection of solenoid valve according to pipe parameters: diameter specification (DN) and interface mode
1) determine the diameter (DN) size according to the pipe diameter or flow requirement.
2) interface mode. In general, >DN50 has to choose interfaces, or DN50 can be freely selected according to users' needs.
5. Selecting solenoid valves according to fluid parameters: material and temperature groups.
1) Corrosive fluids: corrosion-resistant solenoid valves and stainless steel should be selected; food-grade stainless steel solenoid valves should be selected for super-clean fluids;
2) High temperature fluids: electromagnetic valves made of high temperature resistant electrical materials and sealing materials should be selected, and piston type structure should be chosen.
3) Fluid state: as large as gaseous, liquid or mixed state, especially when the diameter is larger than DN25, it must be distinguished.
4) Fluid Viscosity: Usually under 50cSt can be chosen arbitrarily, if more than this value, choose high viscosity solenoid valve.
