Fluid handling – Self-proportioning or correlating systems – Supply and exhaust type
Patent
1990-10-26
1992-03-10
Cohan, Alan
Fluid handling
Self-proportioning or correlating systems
Supply and exhaust type
1374875, 13759617, G05D 1620
Patent
active
050942603
ABSTRACT:
A pressure control system is disclosed for closely regulating the pressure level of a controlled volume. The system comprises first and second sources, a throttled valve for controlling the flow rate of the fluid between each of the first and second pressure sources and the controlled volume, and a feedback control. The throttled valve comprises a rotationally mounted cam, a housing for receiving the cam and including a chamber, a first port coupled to the first pressure source, a second port coupled to the controlled volume, and a third port coupled to the second pressure source. The cam has first and second cam surface portions for defining corresponding first and second transfer functions of fluid flow through the first and second ports, respectively. First and second metering needles are associated with the first and third ports respectively for throttling the fluid flows therethrough. The first and second metering needles are disposed to engage respectively the first and second cam surface portions. A transducer is associated with the controlled volume for providing an output signal indicative of the pressure level therein. A set point indicative of the desired pressure level within the controlled volume is entered into the feedback control, which compares the entered set point with the measured pressure level to determine that desired angular position of the cam with respect to the housing which will provide a corresponding desired rate of fluid flow through the first and second ports.
REFERENCES:
patent: 1641561 (1927-09-01), Whidden
patent: 1959811 (1934-05-01), Brady et al.
patent: 2342770 (1944-02-01), Temple
patent: 2504610 (1950-04-01), Wolf
patent: 2661925 (1953-12-01), Barkelew
patent: 2905462 (1959-09-01), Christenson
patent: 3165327 (1965-01-01), Cripe
patent: 3222996 (1965-12-01), Thieme
patent: 3403700 (1968-10-01), Meynell
patent: 4131130 (1978-12-01), Ruby
patent: 4253480 (1981-03-01), Kessel
patent: 4395258 (1983-07-01), Wang et al.
patent: 4462428 (1984-07-01), Guenther et al.
patent: 4706687 (1987-11-01), Rogers et al.
patent: 4715396 (1987-12-01), Fox
patent: 4747424 (1988-05-01), Chapman
patent: 4836234 (1989-06-01), Hicks
Peterson Michael H.
Stuart John M.
Alcon Surgical Inc.
Cohan Alan
Copeland Barry L.
Schira Jeffrey S.
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