Retrofit commercial accounts will require the installation of either a Reduced Pressure Zone Assembly (RPZ) or Double Check Valve (DCV), determined by SCWA cross Connection Control Dept. based upon degree of hazard under NYS Department of Health guidelines. 5.

All double check valve (DCV) and reduced pressure zone (RPZ) backflow prevention assemblies are designed for in-line service and must be installed to prevent freezing, flooding and mechanical damage with adequate space to facilitate maintenance and testing.

RPZ/DCV devices while very effective in protecting the water supply from backflows can cause reductions in pressure and fire-flow capacity. Fire-flow capacity is regulated by fire departments, fire marshals, fire underwriting agencies and other regulating agencies.

In this course, we will define backflow, codes requirements for backflow prevention, different backflow devices, effect of backflow on system demand, flow characteristics, friction loss, and finally testing requirements. Let’s start by answering what is backflow?

Reduced pressure zone device connected to a fire hydrant. A reduced pressure zone device (RPZD, RPZ, or RPZ valve) is a type of backflow prevention device used to protect water supplies from contamination.

meter. The RPZ (REDUCED PRESSURE ZONE) device must be installed to Forsyth Co. Water and Sewer specifications see backflow preventer’s specifications. The final determination will be at commercial plan review by the Cross Connection Control Specialist. We reserve the right to re-inspect and determine if the hazard has changed and may require

Mar 7, 2023 · Reduced pressure zone (RPZ) valves are essential pieces of the sprinkler system compliance puzzle. These valves provide a high level of protection for any water supply by …

Nov 1, 2022 · This municipality requires a reduced pressure (RPZ) backflow preventer on all fire sprinklers systems located in their jurisdiction. Because the existing single check valve had such a small take out, finding a standard RPZ to replace it with was not possible.

Jun 6, 2018 · An RPZ provides the best level of protection because it has a built-in relief valve, which will open up and actually dump the backflowing water out of the valve, in order to prevent any chance of contaminated water re-entering the water supply.

Nov 29, 2016 · Even if your public water supplier doesn't require an RPZ valve on your high pressure sprinkler system, should you install one anyway? This articles details the many benefits of doing specifically that.