How does a double check valve work?

Any time the pressure on the property side exceeds the pressure on the city side, the two redundant check valves close preventing the reverse water flow. When a flow stop happens, the valve shuts; it is then that the relief valve releases and dumps the water in between the pipes.

Is a backflow preventer the same as a double check valve?

A dual check valve is similar to a double check valve in that it is a mechanical backflow preventer consisting of two independently acting, spring-loaded check valves. However, it usually does not include shutoff valves, may or may not be equipped with test cocks or ports, and is generally less reliable than a DC.

What is a double check valve assembly?

The Double Check Valve Assembly (DCVA) is essentially two single check valves assembled within one body and furnished with four test cocks and two shut-off valves. Double check valve assemblies are commonly used to protect against medium hazard installations such as lawn sprinkler systems.

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Double Check/DC Detector Performance Test - Dsps Wi

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Industry Services Division P.O. Box 7302 Madison, WI 53707-7302 Fax: (608) 267-9723 TTY: (608) 264-8777 http://www.dsps.wi.gov/SB/ Double Check/DC Detector Performance Test Personal information you.

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