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CKD 3 Port Delay Solenoid Valve for Vacuum. Main application is to prevent oil rising during power faliture.
Normally after the machine has stopped, It is necessary to release the pipe to atmosphere after the vacuum valve has completely closed to prevent the oil rising and enter to the pipes. "HVL Off Delay Function Solenoid Valve" can help to break the vacuum between the vacuum chamber and pump and relaease to atmosphere to protect the vacuum chamber (maintain vacuum, prevent contamination)