SAGA HIGH VACUUM PUMPair Ballast: Optional This is a vent pipe introducing air before actual compression which eliminates condensation of the sucked vapour, Their by avoiding contamination of oil.*Air admittanc valve: Optional It is electromagnetic solenoid type which admits air into the system as soon as the power supply fails. This prevents back-flow of oil to system. *Non-return valve:inbuilt It is rubber diapharm type, ... Continue