A device containing a float-check, a check seat and an air inlet port. For both low and high hazard applications, AVBs are intended for use in a non- continuous pressure application (no more than 12 hours of pressure per 24 hour period), in a back- siphonage condition only.
PVB assemblies are intended for use in both continuous and non-continuous pressure applications, in a back-siphonage condition only. A PVB is intended to provide protection in low hazard and high hazard situations.
This assembly is intended for use in both continuous and non-continuous pressure applications., in both back-siphonage and backpressure conditions. A DC is intended to provide protection in low hazard situations.
DCDAs are for use in both continuous and non- continuous pressure applications, in back-siphonage and backpressure conditions. The DCDA is intended to provide protection in low hazard situations only.
Dual Checks are designed for use in low hazard applications where a fully approved, testable backflow preventer is not required. Check with the local authority having jurisdiction for acceptance.
RPs are used for continuous and non-continuous pressure applications, in back-siphonage and backpressure conditions. The RP is intended to provide protection in low and high hazard situations.
RPDAs are intended for use in continuous and non- continuous pressure installations, in back-siphonage and backpressure conditions. The RPDA is intended to provide protection in low and high hazard situations.
Typically built 35+ feet high, barometric loops protect against back-siphonage, based upon the principle that a water column, at sea level pressure, will not rise above 33.9 feet.
Air gaps are primarily used at end of the line service where reservoirs or storage tanks are desired.
