Controller for controlling the operation of a motor operated val

Details Controller for controlling the operation of a motor operated val Controller for controlling the operation of a motor operated val

1990-01-22

1991-07-09

Rosenthal, Arnold

Fluid handling

Processes

25112904, 73168, F16K 3105, G05B 1302

Patent

active

050295977

ABSTRACT:
A controller for controlling the operation of a motor operated valve combination, including a valve yoke, a valve stem, a valve disc, a valve seat and a motor operator having a motor and drive means interconnecting the motor to the valve stem for movement of the valve stem in a first direction to move the valve disc into engagement with the valve seat for closing the valve. The controller comprises a sensor for sensing forces experienced by the valve stem during valve closing and for generating related electrical signals. A first detector is employed for receiving the electrical signals from the sensor, for determining when the rate of change in the valve stem forces exceed a first predetermined limit and for generating an electrical signal when the first predetermined limit is exceeded. A second detector receives the electrical signals from the sensor and from the first detector, determines when, after receipt of the signal from the first detector, the forces experienced by the valve stem exceed a second predetermined limit and generates an electrical signal in response thereto. Motor cut-off circuitry receives the electrical signal from the second detector and stops the operation of the motor in response.

REFERENCES:
patent: 4805451 (1989-02-01), Leon
patent: 4816987 (1989-03-01), Brooks et al.
patent: 4831873 (1989-05-01), Charbonneau et al.
patent: 4856327 (1989-08-01), Branam et al.

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