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Double check valve. A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. [ 1] It is different from the two-way check valves (sometimes erroneously referred to as double check valves) used in air brake systems on heavy trucks which select from the highest ...
A reduced pressure zone device ( RPZD, RPZ, or RPZ valve) is a type of backflow prevention device used to protect water supplies from contamination. RPZDs may also be known as reduced pressure principle (RP), reduced pressure principle backflow prevention devices, [ 1][ 2] reduced pressure zone assemblies (RPZA), [ 3] or reduced pressure ...
A backflow prevention device is used to protect potable water supplies from contamination or pollution due to backflow . In water distribution systems, water is normally maintained at a significant pressure to enable water to flow from the tap, shower, or other fixture. Water pressure may fail or be reduced when a water main bursts, pipes ...
Should the supply pressure drop, the disc springs back opening the vent holes (which let in outside air) and preventing backflow of water. A more complex valve that accomplishes much the same purpose is the backflow preventer. Vacuum relief valves are sometimes known as vacuum breakers.
An Atmospheric Vacuum Breaker ( AVB) is a backflow prevention device used in plumbing to prevent backflow of non-potable liquids into the drinking water system. Diagram of Atmospheric Vacuum Breaker in both working states. It is usually constructed of brass and resembles a 90-degree elbow with a hood on its top to allow air to enter the water ...
An air gap, as related to the plumbing trade, is the unobstructed vertical space between the water outlet and the flood level of a fixture. [ 1] Air gaps of appropriate design are legally required by water health and safety regulations in many countries. An air gap is the simplest form of a backflow prevention device .
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