US 12,000,123 B2
System for monitoring backflow preventer condition
Joseph Michael Burke, Deerfield, NH (US); Kevin Simon, Somerville, MA (US); and Ian David Baynes, Merrimac, MA (US)
Assigned to Watts Regulator Co., North Andover, MA (US)
Filed by Watts Regulator Co., North Andover, MA (US)
Filed on Aug. 25, 2022, as Appl. No. 17/895,462.
Application 17/895,462 is a continuation of application No. 17/115,872, filed on Dec. 9, 2020, granted, now 11,427,992.
Claims priority of provisional application 62/946,130, filed on Dec. 10, 2019.
Prior Publication US 2022/0403632 A1, Dec. 22, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. E03B 7/07 (2006.01); E03C 1/10 (2006.01)
CPC E03B 7/077 (2013.01) [E03C 1/106 (2013.01)] 16 Claims
OG exemplary drawing
 
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.