Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1996-09-17
1997-09-23
Ferensic, Denise L.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
251282, 13711506, 13711512, G05D 1100
Patent
active
056694059
ABSTRACT:
An apparatus and method for automatic disablement of a pressure relief valve used in connection with a backflow preventer in a fire line. A normally open solenoid valve is included in a pressure sampling line, extending from an inlet, or upstream chamber to one side of the pressure relief valve. A water flow switch, interconnected to a power supply and the solenoid valve, is provided in the fire line. In response to water flowing through the fire line, the switch conducts, actuating the solenoid to a closed position. The solenoid thereby hydraulically isolates the inlet sensor line leading to the pressure relief valve. By maintaining high pressure in this portion of the sensor line, the pressure relief valve is effectively disabled. Thus, even if a check valve malfunction occurs, the pressure relief valve will not open and cannot cause a catastrophic loss of water pressure in the fire line.
REFERENCES:
patent: 2037575 (1936-04-01), Hamilton
patent: 2624980 (1953-01-01), Hughes
patent: 3448763 (1969-06-01), Curtiss
patent: 3467127 (1969-09-01), Schneider
patent: 3792713 (1974-02-01), Zadoo
patent: 4550747 (1985-11-01), Woodworth et al.
patent: 5046525 (1991-09-01), Powell
Installation Instructions (pp. 1-4) for "WFDT Vane-Type Waterflow Detector" published by System Sensor, St. Charles, Illinois; .COPYRGT.1991.
Installation And Maintenance Instructions (pp.194-197), Bulletins for Model 8210 and 8211 2-way Internal Pilot Operated Solenoid Valves, Normally Open, Diaphragm Type, published by Automatic Switch Co., Florham Park, New Jersey; .COPYRGT.1978.
Advertising Brochure for Model 5000ss Reduced Pressure Detector Assembly, published by Ames Company, Inc., Woodland, California; Rev. Feb. 1996.
Ames Company, Inc.
Farid Ramyar M.
Ferensic Denise L.
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