Control device for a valve

Details Control device for a valve Control device for a valve

1991-10-11

1992-11-10

Cohan, Alan

Valves and valve actuation

Electrically actuated valve

Remote or follow-up control system for electrical actuator

137486, 1374875, G05D 706

Patent

active

051617773

ABSTRACT:
The safety of control may be secured by decreasing error in the valve position detection to increase the accuracy of flow control and stopping the control function when the valve is in an abnormal condition, so as to prevent any malfunction. The valve position is controlled so that the valve opening rate may correspond with the intended opening rate. When judgement is made to determine that said valve opening rate corresponds with the full-closed position, an output signal produced by the means for detecting the valve displacement when the valve is in the full-closed position is updated and stored as a new signal showing the valve full-closed position, and the intended opening rate of the valve is corrected with reference to the stored value. If the discrepancy between said newly updated and stored signal showing the full-closed position and signal showing the initial valve full-closed position is found to be larger than a predetermined set value, the valve is judged to be in an abnormal state, and then the valve control function is stopped accordingly.

REFERENCES:
patent: 4796651 (1989-01-01), Ginn
patent: 4855659 (1989-08-01), Riensch
patent: 4926903 (1990-05-01), Kawai

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