Typical Applications

Valve Applications x = recommended

model # corrosive potable water waste water irrigation abrasive DCV-backflow preventer 0 x 0 x 0 PVB-baclflow preventer 0 x 0 x 0 RPZ-backflow preventer 0 x 0 x 0

Applications

type of device model back siphonage back pressure continuous pressure low hazard high hazard double check valve DCV x x x x 0 reduced pressure principle RPZ & RPZ II x x x x x pressure type vaccum breaker PVB x 0 x x x

Definition

Back Siphonage - A form of backflow due to a reduction in system pressure which caused a negative or sub-atmospheric pressure to exist at a site in the water system.

Back-Pressure - Any increase of pressure in the downstream piping system above the supply pressure at the point of consideration which would cause or tend to cause a reversal of the normal direction of flow through the assembly.

Continuous Pressure - Extended or prolonged pressure

Low Hazard - An actual or potential threat to the physical properties of the water system or the potability of consumer's water system, but which would not constitute a health or system hazard.

High Hazard - An actual or potential threat of contamination of a physical of toxic nature to the consumer's water system that would be a danger to health.