Method for controlling a butterfly valve

Details Method for controlling a butterfly valve Method for controlling a butterfly valve

2005-03-01

2005-03-01

Bastianelli, John (Department: 3754)

Valves and valve actuation

Electrically actuated valve

Remote or follow-up control system for electrical actuator

Reexamination Certificate

active

06860465

ABSTRACT:
A method of operating a butterfly valve that includes defining the stem stroke of the butterfly valve into a first, a second and a third operation regions, wherein the first operation region corresponds to a lower stem stroke, and the third operation region corresponds to a higher stem stroke of the butterfly valve, providing a first set of PID parameters for the first operation region such that the butterfly valve functions as an on/off control valve in the first operation region, providing a second set of PID parameters for the second operation region such that the butterfly valve functions as a percentage control valve in the second operation region, and providing a third set of PID parameters for the third operation region such that the butterfly valve functions as an on/off control valve in the third operation region, wherein the first and third sets of PID parameters produce a greater output level than the second set of PID parameters.

REFERENCES:
patent: 3888459 (1975-06-01), Bubniak
patent: 4697734 (1987-10-01), Ueda
patent: 4747942 (1988-05-01), Strauss
patent: 6178928 (2001-01-01), Corriveau
patent: 6202628 (2001-03-01), Iwano et al.
patent: 6223700 (2001-05-01), Sano et al.
patent: 6305351 (2001-10-01), Neumann et al.
patent: 6340005 (2002-01-01), Keast et al.
patent: 6568416 (2003-05-01), Tucker et al.
patent: 3630233 (1992-10-01), None
patent: WO 9960255 (1999-11-01), None

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