Summary
There are three places that connection port, and the three-way solenoid valve has a valve seat in the valve in two places. Always one of the valve seat portion is open, the other valve seat is closed now.
Three-way solenoid valve, which is used to control the air for the opening and closing operation of the machine, such as single-acting cylinder or diaphragm normal operation, you can also be used to direct control of the liquid.