Fluid handling – With indicator – register – recorder – alarm or inspection means – Position or extent of motion indicator
Patent
1992-10-07
1993-07-13
Chambers, A. Michael
Fluid handling
With indicator, register, recorder, alarm or inspection means
Position or extent of motion indicator
137557, 116 70, 340611, F16K 3700
Patent
active
052264475
ABSTRACT:
A detection system is provided for sensing a malfunction of a valve having an outlet connected to an end of a first pipe through which pressurized fluid may be flowed in a downstream direction away from the valve. The system includes a bypass pipe connected at its opposite ends to the first pipe and operative to bypass a portion of the fluid flow therethrough around a predetermined section thereof. A housing is interiorly divided by a flexible diaphragm into first and second opposite chambers which are respectively communicated with the first pipe section and the bypass pipe, the diaphragm being spring-biased toward the second chamber. The diaphragm housing cooperates with check valves and orifices connected in the two pipes to create and maintain a negative pressure in the first pipe section in response to closure of the valve during pressurized flow through the first pipe. A pressure switch senses the negative pressure and transmits a signal indicative thereof to a computer. Upon cessation of the signal while the valve is still closed, the computer responsively generates a signal indicating that the valve, or another portion of the detection system, is leaking.
REFERENCES:
patent: 3517692 (1970-06-01), Elrod
patent: 3901178 (1975-08-01), Bermel
patent: 3963043 (1976-06-01), Cota et al.
patent: 4043355 (1977-08-01), Cerruti et al.
patent: 4161962 (1979-07-01), Maringer et al.
patent: 4825802 (1989-05-01), Le Bec
patent: 5057822 (1991-10-01), Hoffman
Broad, Jr. Robert L.
Chambers A. Michael
Manning John R.
Miller Guy M.
The United States of America as represented by the Administratio
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