Series140C SewageAir/VacuumValve Series401 HydraulicallyControlled Air/VacuumValve Series7000 AirVentValve Series50 AirReleaseValve Series55 Air/VacuumValvewith ThrottlingDevice Series140 SlowClosing CombinationAirValve Series1700 ©2011DeZURIK,Inc.2 TheoryandUseofAirValves Engineers:A rR as Va v sanA ...