# US 5,771,920 A · Domestic water valve assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,771,920 A - Document ID: US5771920A - Status: Granted - Kind: A - Application number: 08/905,587 - Filed: 1997-08-04 - Granted: 1998-06-30 - Earliest claimed: 1997-08-04 - Assignees: FloLogic, Inc. - Inventors: Warren R. Jewett; Perry A. Genova - Web page: https://patentgrep.com/patent/US5771920A ## CPC - E03B 7/071: {Arrangement of safety devices in domestic pipe systems, e.g. devices for automatic shut-off} - G01M 3/2807: {for pipes (G01M3/2892, G01M3/30 take precedence)} - Y02A 20/15: Leakage reduction or detection in water storage or distribution - Y10T 137/7723: Safety cut-off requiring reset - Y10T 137/7727: Excessive flow cut-off - Y10T 137/7761: Electrically actuated valve - E03B: INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER (drilling wells, obtaining fluids in general from wells E21B; pipe-line systems in general F17D) - G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR - Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A domestic water valve assembly protects against water leaks by closing a valve if a leak is detected. A leak is detected when a water flow rate falls below a predetermined low flow rate for a length of time longer than a predetermined time-out period or when the water flow rate exceeds a predetermined high flow rate. The predetermined high flow rate, low flow rate, and time-out period may be changed by an operator. When a leak is detected, a control system activates an electric motor to close a valve, the valve remaining closed until reset by the operator. ## Claims ### Claim 1 A domestic water valve assembly, comprising: a housing, said housing having a water inlet in fluid communication with a water outlet; a means for determining a flow rate of a flow of water from said water inlet through said housing and out said water outlet; a means for storing a predetermined high flow rate, a predetermined low flow rate and a predetermined time-out period; a means for comparing said flow rate of water with said predetermined high flow rate and said predetermined low flow rate; and a means for controlling said flow of water; wherein said controlling means stops said flow of water when said flow rate of water exceeds said predetermined high flow rate; and wherein said controlling means stops said flow of water when said flow of water is detected by said determining means and said flow rate of water falls below said predetermined low flow rate for a length of time exceeding said predetermined time-out period. ### Claim 2 (depends on 1) The domestic water valve assembly according to claim 1, wherein said determining means includes a vane disposed within a cavity of said housing, said flow of water flowing through said cavity, said vane being disposed obliquely to said flow of water and being pivotable about an axis, said flow of water causing said vane to rotate about said axis in proportion to said flow rate of water. ### Claim 3 (depends on 2) The domestic water valve assembly according to claim 2, wherein said determining means further comprises a sensor for measuring said rotation of said vane. ### Claim 4 (depends on 3) The domestic water valve assembly according to claim 3, wherein said sensor is a variable resistor. ### Claim 5 (depends on 1) The domestic water valve assembly according to claim 1, wherein said controlling means includes a valve. ### Claim 6 (depends on 5) The domestic water valve assembly according to claim 5, wherein said valve is a ball valve. ### Claim 7 (depends on 5) The domestic water valve assembly according to claim 5, wherein said controlling means further comprises an electro-mechanical means for opening and closing said valve. ### Claim 8 (depends on 7) The domestic water valve assembly according to claim 7, wherein said electro-mechanical means comprises an electric motor. ### Claim 9 (depends on 1) The domestic water valve assembly according to claim 1, wherein said controlling means includes a means for setting said predetermined high flow rate. ### Claim 10 (depends on 1) The domestic water valve assembly according to claim 1, wherein said controlling means includes a means for setting said predetermined low flow rate and said predetermined time-out period. ### Claim 11 (depends on 1) The domestic water valve assembly according to claim 1, wherein said controlling means includes a means for resetting said valve to an open condition. ### Claim 12 (depends on 1) The domestic water valve assembly according to claim 1, wherein said controlling means includes a means for closing said valve in response to an operation by an operator. ### Claim 13 (depends on 1) The domestic water valve assembly according to claim 1, wherein said controlling means includes a means for displaying a condition of said domestic water valve assembly. ### Claim 14 (depends on 1) The domestic water valve assembly according to claim 1, wherein said controlling means includes a battery for supplying power to said controlling means.