Designed for use in non-health hazard cross-connections and continuous pressure applications subject to backpressure or backsiphonage incidents, such as lawn sprinklers, fire sprinkler lines, commercial pools, tanks and vats, and food cookers. Have a question or two? Visit our Customer Support page to find the answers you're looking for.

Series 757 Double Check Valve Assembly Backflow Preventers are designed to prevent the reverse flow of liquids in a plumbing system due to backpressure or backsiphonage where there is a non-health hazard. Compact design and lightweight stainless steel construction (70% lighter than traditional designs) makes installation easier and faster.

Double Check Valve Assembly Backflow Preventers with Freeze Sensor. Series 007 double check valve assembly backflow preventers include a freeze sensor for use with SentryPlus Alert® technology to signal facility personnel when temperature nears and reaches the freezing point.

This article discusses underground and above-ground installations of a double-check valve assembly. Before installation, run the main irrigation supply line from the isolation valve to the vicinity of the DCVA valve box. Temporarily seal the end of the pipe to keep out soil and debris.

This double check valve assembly is designed to prevent the backflow of polluted water from entering into the potable water supply due to back siphon-age and or backpressure. It's compact modular design means easy maintenance with a single access cover for in-line repairs.

These Wilkins 350 Series double check valve assemblies, manufactured by Zurn, are designed for installation on water lines to protect against both back-siphonage and back-pressure of polluted water into the water supply.

Shop Watts 007 check valve assemblies, available in a variety of connection types. Order Watts 007 double check valves online today with fast shipping and easy returns.

Series LF709 Lead Free* double check valve assembly backflow preventers help stop the reverse flow of polluted water from entering into the potable water supply. This series has a modular …

A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. [1] . It is different from the two-way check valves (sometimes erroneously referred to as double check valves) used in air brake systems on heavy trucks which select from the highest pressure source.

The DCVA is effective against backflow caused by backpressure and backsiphonage and is used to protect the water system from pollutants that would not constitute an actual health hazard, but that might be objectionable to the water supply system. The DCVA is used to isolate non-health hazards (see Figure 2-15).