The following is a brief description of the solenoid valve position and pass each refers to what:
Solenoid valve position is the position of the valve core, such as 2 is 2 positions, 3 words is more than a middle position; Solenoid valve is the air passage, in most cases is the air vent;
So the so-called 2 position 3, is 2 position of the valve spool and 3 ventilation port of the solenoid valve, in addition to note that three four-way four-way sometimes may be 5 mouth, 5 air vent is not the other one combined.
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