What is a 9D plumbing?
Series 9D Dual Check Valves with Intermediate Atmospheric Vent prevent the reverse flow of hot or cold polluted water from entering into the potable water supply. They have a brass body with stainless steel internal parts, integral strainer, and two durable, tight-sealing, rubber check valves.
Can a Watts 9D be installed vertically?
May be installed horizontally or vertically. Quick closing valves, water hammer or supply pressure fluctuations can cause intermittent discharge. The installation of a Water Hammer Arrestors (Watts Series 05) or Water Pressure Regulator (Watts Series 1156 or 25AUB) may be required to correct the problem.
Do water meters have backflow preventers?
Water meters that are 20 mm and 25 mm have an integral dual check valve (low hazard rating). Water supplies on all construction sites must have a backflow prevention device and a water meter.
What is an atmospheric vent backflow preventer?
These valves provide safe means of protecting the incoming water supply from contamination caused by backflow/back pressure. Atmospheric vent allows to dispose of purged water into an existing drain.
What is a reduced pressure zone backflow preventer?
A Reduced Pressure Zone (RPZ) lets you know that the valve is working properly. RPZ backflow preventers consist of two independent check valves. Backflow preventers work by letting water flow through them in one direction, but prevent water from flowing back through them in a reverse direction.
Where is the backflow preventer located?
Where is the Backflow Preventer Located? You should have your backflow prevention assembly installed inside an above-ground enclosure. It’s the safest and most cost-effective place to put it.
How do I know if I have a backflow preventer?
You can check to see if you have a backflow prevention assembly by looking at where water enters your property (usually in a basement by the water heater, a crawl space, or in a mechanical room).
What is an RP backflow preventer?
The RP-500 Backflow Preventer is designed to supply maximum protection against back flow caused by negative pressure or backpressure. Backflow may cause infiltration of chemicals, fertilizers and/or other pollutants into potable water systems.
