This category includes substances which can cause significant harm to health, including chemicals that are toxic, carcinogenic, or pesticides, and it is therefore vital that appropriate backflow protection is used when working with these types of water supplies.
The RPZ valve works by ensuring that the water entering the downstream system is at a lower pressure than the incoming supply, typically reducing it by 0. An RPZ valve can often be one of the safest backflow prevention devices available, providing the correct upkeep is undertaken. These valves need to be installed by competent and qualified plumbers, tested at least annually, and fully maintained to ensure that they perform correctly and continuously safeguard the water supply.
Incorrect installation or use can risk contamination and incur costs to put things right, and testing is vital to proper performance. However, these routine tests come at a cost, making the valves expensive to maintain when compared to alternatives such as air gap options. It is important that the installation is completed by a fully qualified contractor.
The valve also includes an integrated tundish with a built-in AA Air-gap, an essential component for the best performance. Home About us News. Reduced Pressure Zone RPZ Backflow Preventer - Commercial The Reliance commercial reduced pressure zone RPZ valve incorporates a double check valve and can provide protection against back pressure and back siphonage of up to fluid category 4.
Product Information. Backflow preventers are commonly installed in buildings where clean water cross-connects with any of the following installations:. Backflow prevention devices are most common in commercial settings, but some residences may also need one. One of the most common reasons for a residential backflow preventer installation is a home sprinkler system that cross-connects with the drinking water system. If something happens that causes a drop in pressure in the water mains, such as the use of a nearby fire hydrant or a burst pipe, contaminants can flow back through the sprinkler head because of the pressure difference.
This can introduce fertilizers and pesticides into potable water. The State of Illinois requires that every backflow device be inspected annually by a certified backflow tester, and every city that operates a public water system is responsible for making sure that this is done. Why is backflow testing required? The purpose of a backflow system is to protect the quality of drinking water.
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