Electromagnetic valve wiring diagram

The solenoid valve power cord is generally connected to two lines. Many users have bought three wiring above, so how is the solenoid wiring mode? Explanation: The red and black of the tabs are the power cord, and the other is a grounding wire, which is connected to the solenoid valve housing, prevents the solenoid valve leakage, and the safety protection effect; the plug-in junction box has three terminals, and the terminal is power supply Wiring, no positive and negative, a stand-alone terminal is a ground line. The solenoid valve wiring is as follows: