Water Check Valve Backflow Preventer

This double check valve assembly is designed to this double check valve assembly is designed to prevent the backflow of polluted water from entering into the potable water supply due to back siphon age and or backpressure.

Water check valve backflow preventer. Back siphonage occurs when higher pressure fluids gases or suspended solids move to an area of lower pressure fluids. A backflow preventer is a check valve installed on potable water supply piping to prevent possible contamination of the water supply system by backflowing but contaminated water from the building into the outside public water supply mains. Check valves prevent backflow into sump disposal lines wastewater lines sewage lift stations and ejector systems. Backwater valves protect against weather conditions that cause sewage overflow such as heavy rain.

Backflow preventers prevent contamination of potable water by keeping water from flowing backwards into a water supply line. If either check valve should leak the relief valve is designed to open and discharge water to the outside ensuring that backflow never occurs. During normal operation of an rpz backflow preventer the pressure between the two check valves referred to as the zone of reduced pressure is maintained at a lower pressure than the supply pressure. Backflow preventers prevent contamination of potable water by keeping water from flowing backwards into a water supply line.