Principle and structure varieties
1) Nominal pressure: this parameter is the same as the meaning of other general-purpose valves, is based on the nominal pressure of the pipeline to determine.
2) working pressure: if the working pressure is low, you must choose direct-acting or step-by-step direct-acting principle; low differential pressure in the 0.04Mpa or more when the direct-acting, step-by-step direct-acting, pilot-operated can be selected.
4, electrical selection: voltage specifications should try to prioritize the selection of AC220V, DC24 is more convenient.
5, according to the duration of the work time to choose: normally closed, normally open, or can be continuously energized
1) when the solenoid valve needs to be open for a long time, and lasts longer than the time of closure should be selected normally open type;
2) If the opening time is short or the opening and closing time is not much, then select the normally closed type; 3) However, some solenoid valves are used for safety purposes.
3) But some of the conditions used for safety protection, such as furnace, kiln flame monitoring, can not be selected normally open, should be selected for long-term energized type.