Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1997-09-23
1999-09-14
Ferensic, Denise L.
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
137486, 25112904, F16K 3112, F16K 3102
Patent
active
059506687
ABSTRACT:
A control assembly includes a positioner/actuator and a control valve. The positioner/actuator includes a valve actuator and a positioner for controlling actuator position and speed in response to a control signal. The control valve has a characteristic flow rate as a function of time. The positioner may include an electronic control circuit for modifying the travel speed of the actuator to produce a desired flow rate as a function of time. The positioner may determine an error between a desired actuator position and an actual actuator position and apply a correction signal to reduce the error. The correction signal is asymmetric with respect to error polarity.
REFERENCES:
patent: 3906196 (1975-09-01), Spitz
patent: 4103695 (1978-08-01), Aono
patent: 4366743 (1983-01-01), Leszczewski
patent: 4386553 (1983-06-01), Thoman et al.
patent: 4417312 (1983-11-01), Cronin et al.
patent: 4481451 (1984-11-01), Kautz et al.
patent: 4506642 (1985-03-01), Pfalzhgraf et al.
patent: 4546426 (1985-10-01), Hafner et al.
patent: 4742465 (1988-05-01), Eastman
patent: 4842162 (1989-06-01), Merkel
patent: 4901625 (1990-02-01), Bussan et al.
patent: 4925156 (1990-05-01), Stoll et al.
patent: 4926903 (1990-05-01), Kawai
patent: 4961441 (1990-10-01), Salter
patent: 5054650 (1991-10-01), Price
patent: 5159949 (1992-11-01), Prescott et al.
patent: 5179330 (1993-01-01), Nikolaus
patent: 5285715 (1994-02-01), Elrod et al.
patent: 5304093 (1994-04-01), Sharp et al.
patent: 5431182 (1995-07-01), Brown
Baumann, Hans D., "Positioners set the Course for Modern Control Valve Designs", I&CS, May, 1997, pp. 41-45.
Ferensic Denise L.
Fisher Controls International Inc.
Kim Joanne Y.
LandOfFree
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