vacuum breaker


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vacuum breaker

[′vak·yəm ‚brāk·ər]
(engineering)
A device used to relieve a vacuum formed in a water supply line to prevent backflow. Also known as backflow preventer.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

vacuum breaker

vacuum breaker
A backflow preventer which prevents a vacuum in a water-supply system from causing backflow.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
2 Vacuum breaker or sequencing valve--at each receiver directs vacuum to that receiver.
Vacuum Breaker. 36% of units surveyed did not have all potable water hose temporary connections equipped with a vacuum breaker (back flow preventer NSN: 4820-00-164-3377).
Also check that the boiler is fitted with a vacuum breaker to prevent it falling below atmospheric pressure as it cools.
Kits vary slightly from brand to brand; choose one that includes a timer, a filter, a pressure regulator, and an antisiphon device (also called a backflow preventer or vacuum breaker), which keeps irrigation water from being drawn back into the public water system and is required by many localities.
Experienced builders will use a Hartford loop with a vacuum breaker on all vanishing-edge projects.
The blower's vacuum breaker valve balances conveying rates on the vacuum and pressure sides of the system.
A vacuum breaker keeps water from flowing back into the system.
The comprehensive water gauge control valve is attached to the hose bib downstream from any vacuum breaker, so once the line is pressurized, the condition of the vacuum breaker becomes apparent.
Check the seal on the dump can on the cyclone, the filter housing lid seal at the pump, the vacuum breaker valve, (verify it has air 85 to 100 psi), and all piping connections.
Most frost-proof faucets have a built-in vacuum breaker located on top of the faucet (Photo 4).
To prevent backflow, leave 2 inches between emitters and foliage or soil, or place an atmospheric vacuum breaker on the line 6 inches above the highest emitter.