BACKFLOW PREVENTER AND RELIEF VALVE ASSEMBLY

摘要

BACKFLOW PREVENTER AND RELIEF VALVE ASSEMBLYAbstract of the DisclosureA backflow prevention assembly designed for connection betweena main supply line and a service pipe in water supply service, comprisingtwo check valves in series and a relief valve For draining the chamberbetween the two check valves under certain operating conditions.