Backflow is the unintended flow of water from any domestic, industrial or institutional piping system into a drinking water supply system.  It can be caused by a loss of pressure in the drinking water supply main or by the flow from a pressurised system through an unprotected cross connection.

The Pressure Relief Valve was designed to counter the effects of hydrostatic pressure in larger ponds with a minimum depth of 1.5m. The Pressure Relief Valve is a spring-loaded device (rated at 90 PSI) that opens when enough hydrostatic pressure is present, allowing the ground water to enter the system. Once the pressure is released, the valve will close on its own and the spring gasket will re-seal the system. A 2″ bulkhead fitting is required to thread the valve into.

To speak with your local Backflow Prevention specialist about your backflow prevention requirements, find and contact them here.

Your requirements are based on the level of risk for your property. See below a general backflow requirements guide of risk level.