What does a reduced pressure zone (RPZ) backflow preventer help to prevent?

A reduced pressure zone (RPZ) backflow preventer is specifically designed to prevent cross-connections between potable (drinking) water systems and non-potable (potentially contaminated) systems. This is crucial in protecting the public water supply from contamination, which can occur when pressure changes in the system allow potentially unsafe water to flow back into the clean water supply.

The RPZ backflow preventer operates by maintaining a pressure difference between the potable water supply and the system it is protecting. It features two water pressure sensing mechanisms, which open to let the water flow out, and close when back pressure is detected, thus stopping any reverse flow that could cause contamination. This capability is essential in various applications, especially in commercial settings where chemicals or pollutants might be present.

Understanding the function of an RPZ backflow preventer is vital for ensuring safe drinking water standards are upheld, making it a critical component in residential and commercial plumbing systems to maintain public health safety.