FAQ

Types of Backflow Preventers

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Double Check Valve Assembly (DC)

An assembly containing two (2) independently acting approved check valves, four (4) resilient-seated test cocks, and two (2) resilient-seated isolation valves. This assembly is intended for use in both continuous and non-continuous pressure applications., in both back-siphonage and backpressure conditions. A Double Check Valve is intended to provide protection in low hazard situations.

Testing:
(1) The No. 1 check valve shall be tight against reverse flow under all pressure differentials.
(2) The No. 2 check valve shall be tight against reverse flow under all pressure differentials.


Double Check Detector Assembly (DCDA)

A specifically designed assembly composed of a line-sized approved double check valve assembly, with a specific bypass water meter, and a meter-sized approved double check valve assembly. This meter shall register accurately for all flows up to and including three (3) GPM. The meter shall show a registration of all flows above three (3) GPM. This assembly is intended for use in both continuous and non-continuous pressure applications, in back-siphonage and backpressure conditions. The Double Check Valve Assembly is intended to provide protection in low hazard situations only.

Testing:
1) The No. 1 check valve shall be tight against reverse flow under all pressure differentials.
2) The No. 2 check valve shall be tight against reverse flow under all pressure differentials.

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Text courtesy of Wilkins a Zurn company.