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909 (2.5

909 (2.5"-10") / LF909 (2.5"-10")

Watts 909 Backflow Preventer is a reduced pressure backflow assembly (Watts RPZ 909). Production of the Watts 909 backflow preventer began in 1979. The Watts 909 3/4"-3" size body is constructed of bronze. The Watts 909 2 1/2"-10" size check body is cast iron with a fused epoxy coating. The Watts 909 2 1/2" and 3" are available in bronze and cast iron. Watts 909 also has a hot water option available in the 3/4"-2" which is good up to 210° F. The model Watts 909M1 was introduced in 1989 in the 3/4"-2" and 4"-10" sizes. The 3/4"-2" size was changed by having the nipple between the body and the shutoff cast into the body instead of being a separate nipple. The Watts 909 design had a bronze relief valve body. In the Watts 909M1 modification the relief body was changed to fused epoxy coated cast iron. The relief valve spring assembly was also changed. In the 8"-10" 909M1 sizes there was a change in the relief valve body. The relief valve utilizes the internal parts of the 4"-6" 909 unit. In the Watts 909M1 series the relief valve rubber repair parts will be the same in 4"-10". The check seats are replaceable and springs are contained when the covers are removed. The 2 1/2"-10" has an external relief valve sensing line and the relief valve body can be detached from the check body on these sizes.

 

909 (2.5"-10") / LF909 (2.5"-10")

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