Water Check Valve Backflow Preventer

Backflow preventers prevent contamination of potable water by keeping water from flowing backwards into a water supply line.

Water check valve backflow preventer.

Back siphonage occurs when higher pressure fluids gases or suspended solids move to an area of lower pressure fluids. 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. 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.

Another common location for a backflow preventer is the connection of a fire sprinkler system to a water main to prevent pressurized water from flowing from the fire suppression system into the public water supply. 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. Check valves prevent backflow into sump disposal lines wastewater lines sewage lift stations and ejector systems.