Water Check Valve Backflow Preventer

If either check valve should leak the relief valve is designed to open and discharge water to the outside ensuring that backflow never occurs.

Water check valve backflow preventer.

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. 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. Backwater valves protect against weather conditions that cause sewage overflow such as heavy rain.

It s compact modular design means easy maintenance with a single access cover for in line repairs. They are used in industrial settings where chemicals are connected to water lines and in municipal water systems to keep undesirable liquids and solids from contaminating plumbing. Back siphonage occurs when higher pressure fluids gases or suspended solids move to an area of lower pressure fluids. Check valves prevent backflow into sump disposal lines wastewater lines sewage lift stations and ejector systems.