High Hazard: Any condition, device or practice that, in connection with the water supply system, has the potential to cause death.

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603.3.2 Atmospheric Vacuum Breaker (AVB). An atmospheric vacuum breaker consists of a body, a checking member, and an atmospheric port.

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Low Hazard: Any condition, device or practice that, in connection with the water supply systems, constitutes a nuisance but does not endanger health or cause injury.

By code, water pressure inside your house should be between 40-80 pounds per square inch (psi). If the water pressure delivered by your water supplier is higher ...

Tempering valves are safety devices designed to limit the temperature of the hot water coming out of your tap. It mixes the extremely hot water that comes ...

Contaminants used in some applications can pose a serious risk to the safety of the fresh water supply in your area. This can potentially allow contaminated water containing such as hazardous chemicals, bacteria and debris to flow back up into the water service.

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Backflow testing ensures the device is working to protect the drinking water in your area. During a backflow test, your plumber will turn off the downstream shut-off valve, wait a few minutes and test the pressure in the system using a special backflow testing kit. The test is carried out to ensure the pressure is as it should be and the device is functioning.

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Atmospheric Vacuum BreakerBackflow preventer

A licenced and accredited backflow prevention plumber is required to test, inspect and commission the backflow devices. Your backflow plumber will submit the completed test report to Sydney Water (or relevant water authority or council) on your behalf.

Medium Hazard: Any condition, device or practice that, in connection with the water supply system, has the potential to endanger health.

Properties with a high or medium hazard rating must have a backflow device test carried out after the device installation and then once a year after that.

Examples of properties or situations where a backflow prevention device is required include - construction sites, emergency sprinkler or fire service systems, swimming pools, manufacturing facilities, and restaurants with grease traps.

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The purpose of a vacuum breaker is to stop backsiphonage. The atmospheric vacuum breaker (AVB) consists of a valve that allows air into the piping system for the purpose of stopping a downstream siphon (see Figure 603.3.2a). At the same time, a check valve is closed to the supply piping. A common design element is that the airinlet valve and check valve are nearly always the same mechanical component. A float rises with water pressure to seal the system for water to flow and drops with a lack of water pressure opening to the atmosphere.

201181 — This standard applies to two types of backflow prevention assemblies, identified as ... (a) Reduced Pressure Principle Backflow Preventers (RP); ...

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General Backflow Prevention Requirements Guide. Abbreviations. RPZD, Reduced Pressure Zone Device. DCV, Double Check Valve. DDCV, Double Detector Check Valve.

A backflow device is fitted to the fresh water pipe on your property to stop the flow of water moving back into the mains water system which can occur if there is a difference or drop in water pressure.

Low hazard properties are usually fitted with a non-testable backflow device. Many smaller Sydney Water meters (20 or 25 mm) are fitted with a backflow prevention device which is suitable for low-risk use.