an anti-siphon device that's required in most areas
an approved, testable assembly which uses valves, in different configurations, to prevent polluted or contaminated water from reversing direction and flowing backward
A specialized piping component that contains the functional equivalent of two check valves and a vent port. It prevents any fluid from a hydronic system from flowing backward and contaminating fresh water.
A device to prevent backflow, especially into a potable water supply. This is generally required for handheld showers, pullout faucet spouts, kitchen sprayers, etc.
A device or means to prevent backflow into the potable water supply.
A device used to prevent backflow. In some areas, plumbing codes require a backflow preventer.
Plumbing device which prevents the backflow of water (reversing its flow and returning to the supply system) by using a check valve, which permits flow in only one direction by using a hinged flapper or guided poppet that opens when the flow is going in one direction but will close if the direction reverses. An air gap, which is a vertical distance between the outlet of the supply and the overflow rim of the fixture into which the water flows. Water, under pressure, can pass over an air gap but cannot return to the supply. Plumbing codes usually require that backflow preventers are installed between the water main and the branch connections to individual service.
A device or means that prevents a reversal of water flow in drainage or supply pipes.
A device that prevents water from traveling from one system back into any part of the main distribution system. Usually required for handshowers, pullout faucet spouts, and kitchen sprayers.
Backcheck valve; a device which prevents sewage from flowing backward into a buildings plumbing system.
An absolutely critical piece of equipment which serves to prevent the flow of contaminated water from the lateral lines back into the public water supply. Backflow preventers include AVB (Atmospheric Vacuum Breaker), PVB (Pressure Vacuum Breaker), DCA (Double Check Assembly), and RPZ (Reduced Pressure Zone) devices. Back to glossary index.
Part of Pressure-Lite toilet flush control components, along with aspirator, pressure regulator, and outlet manifold. These components work with the incoming pressurized supply line water to provide a regulated pressure flush to the toilet bowl.
A device or system installed in a water line to stop backflow from a nonpotable source.
"Backflow preventer" means a device or means to prevent backflowinto the potable water system.
"Backflow preventer (reduced pressure zone type)" means an assembly of differential valves and check valves including an automatically opened spillage port to the atmosphere.
Automatic valve used in hose accessories to ensure water flows only in one direction. Used in permanent fire department connections (FDC) to sprinklers and dry standpipes, as well as portable devices used in firefighting.