The solenoid valve is a protection device for electrically shutdown. When the solenoid valve is energized, the security high pressure oil circuit is cut off by the throttle, so that the main steam valve, regulating steam valve, extraction check valve are quickly closed. Solenoid valve accepts the following signal and acts:
1. Manually operated:  Manually press “Stop ” button at the dial panel of the control room to make the solenoid valve be energized and act.
2. The lubricating oil pressure is lower: when the lubrication oil pressure decreases to 0.02MPa, the electro connecting pressure gauge is energized to make the solenoid valve act.
3. The vacuum is low: When the vacuum decreases to -0.08MPa, alarm is given; when the vacuum decreases to -0.06MPa, the solenoid valve is energized and stops.
4. The vibration is bigger: When the bearing vibrates to 0.1mm, alarm is given; when the bearing vibrates to 0.14mm, the solenoid valve is energized and acts