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2. Double check valve - Wikipedia

   en.wikipedia.org/wiki/Double_check_valve

   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 ...

3. Reduced pressure zone device - Wikipedia

   en.wikipedia.org/wiki/Reduced_pressure_zone_device

   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 ...

4. Backflow prevention device - Wikipedia

   en.wikipedia.org/wiki/Backflow_prevention_device

   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 ...

5. Vacuum breaker - Wikipedia

   en.wikipedia.org/wiki/Vacuum_breaker

   Vacuum breaker. A vacuum breaker is a device that prevents water from being siphoned backward in a direction it is not desired to go. They are commonly placed on a bibcock valve or toilet or urinal flush valve, in which application they can prevent hose or drainage water from back-siphoning into the public drinking water system.

6. Atmospheric vacuum breaker - Wikipedia

   en.wikipedia.org/wiki/Atmospheric_vacuum_breaker

   Atmospheric vacuum breaker. 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 ...

7. Reps call on postmaster general to implement new heat rule ...

   www.aol.com/reps-call-postmaster-general...

   Texas Rep. Greg Casar (D) led more than 70 members of Congress in a joint letter to U.S. Postmaster General Louis DeJoy to demand protection for U.S. Postal Service workers amid a wave of extreme ...