Valves and valve actuation – Electrically actuated valve – Remote or follow-up control system for electrical actuator
Patent
1995-10-03
1998-01-27
Rivell, John
Valves and valve actuation
Electrically actuated valve
Remote or follow-up control system for electrical actuator
25112912, 251331, F16K 3104
Patent
active
057115079
ABSTRACT:
An automatically-calibrating electrically-controlled diaphragm valve actuator has a stepper motor controlled by a controller mechanism for moving the actuator within a diaphragm valve. A reference position indicator is provided to signal the controller mechanism when the valve actuator is at a reference position within the actuator's linear stroke. A method for automatically calibrating an electrically controlled diaphragm valve actuator includes the following steps. The actuator is initially driven to a reference position. Second, the actuator is driven a first number of steps. Third, the actuator is returned to the reference position. Fourth, it is determined whether fall back has occurred. Fifth, a second number of steps is determined based upon whether fall back has occurred. Sixth, the actuator is driven the second number of steps in order to compensate for the fall back. Finally, the third through sixth steps are repeated until the number of motor steps denoting the full closed position of the actuator is known within a predetermined tolerance.
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Berget Mark D.
Manthei Dennis L.
Gas Research Institute
Rivell John
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