Mechanical torque limit for valve actuator

Details Mechanical torque limit for valve actuator Mechanical torque limit for valve actuator

1977-01-24

1978-09-12

Schaefer, Robert K.

Electricity: motive power systems

Automatic and/or with time-delay means

Motor load, armature or primary or secondary circuit current

318434, 307124, H02H 708, H02P 300

Patent

active

041140788

ABSTRACT:
An electrically energized actuator for operating a valve has an output shaft for connection to a rotatable valve stem and is driven, via a gear train, by an electrically energized motor. A safety shut off mechanism is responsive to a predetermined resistance to rotation of the output shaft to operate an electric switch which prevents further operation of the drive motor.

REFERENCES:
patent: 2062905 (1936-12-01), Hilty et al.
patent: 3132730 (1964-05-01), Dahlstrand et al.
patent: 3423661 (1969-01-01), Gustafson
patent: 3524526 (1970-08-01), Denkowski
patent: 3553557 (1971-01-01), Korthaus et al.
patent: 3599067 (1971-08-01), Wallis
patent: 3891908 (1975-06-01), Porras

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