CPC E03B 7/077 (2013.01) [E03C 1/106 (2013.01)] | 16 Claims |
1. A backflow preventer for preventing a reverse flow of water in a plumbing system, comprising:
a body having an inlet for connection to an upstream portion of the plumbing system and an outlet for connection to a downstream portion of the plumbing system;
a first check valve and a second check valve located in the body for preventing the reverse flow of water between the outlet and the inlet;
an inlet pressure zone positioned in the body between the inlet and the first check valve;
an outlet pressure zone positioned in the body between the outlet and the second check valve;
an intermediate pressure zone positioned in the body between the first and the second check valves;
an intermediate pressure sensor located in the intermediate pressure zone;
a controller in communication with the intermediate pressure sensor,
wherein the controller is configured to generate a leak error signal if pressure in the intermediate pressure zone changes while both check valves are in a closed position.
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