Boots – shoes – and leggings
Patent
1987-04-13
1989-03-28
Ruggiero, Joseph
Boots, shoes, and leggings
1374875, 25112901, 36416701, 364510, G05B 1302, F16K 3102
Patent
active
048169870
ABSTRACT:
A microprocessor-based valve motor control system which provides control, predictive control and diagnostic functions for a motor operated valve. A microprocessor periodically tests the status of the motor operated valve, and turns off the valve's motor if certain predefined criteria for the valve stem position and the valve stem load are satisfied. The periodic testing by the microprocessor includes the testing of a position criterion (comparing both the current valve stem position signal and a predicted stem position with a preselected target position); and a stem load criterion (comparing both the current valve stem load and a predicted stem load with a preselected maximum desirable stem load).
When the control system is being used with a gate valve for fully opening and fully closing a valve, the control logic can use either a predicted position criterion or a predicted stem load criterion to determine when to turn off the valve motor. When the control system is being used with a flow control valve, the use of a predicted position criterion minimizes overshoot problems which cause the motor to be reversed one or more times while moving to a target position.
Motor overload protection is provided by periodically measuring the actual load on the motor and turning off the motor if the measured motor load exceeds any one of a plurality of preselected maximum motor load values for a corresponding period of time.
REFERENCES:
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patent: 4406122 (1983-09-01), McDuffie
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patent: 4487333 (1984-12-01), Pounder et al.
patent: 4523286 (1985-06-01), Koga et al.
patent: 4562531 (1985-12-01), Enterline et al.
patent: 4587967 (1986-05-01), Chu et al.
patent: 4694390 (1987-09-01), Lee
Brooks Boyd P.
Lee Robert A. S.
Electric Power Research Institute Inc.
Ruggiero Joseph
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