Abstract: An electrically operated fail-safe valve actuator employs a spring which is wound to store energy during operation of the electric drive motor, an electric clutch operable to disengage the drive motor from the actuator output shaft in response to loss of power from the electrical supply whereby the spring drives the valve in the opposite direction.
Type:
Grant
Filed:
October 29, 1975
Date of Patent:
November 6, 1979
Assignee:
Amelia Inc.
Inventors:
John H. Fitzwater, deceased, by Amelia Fitzwater, executrix