Servo-actuator with fail safe means

Details Servo-actuator with fail safe means Servo-actuator with fail safe means

1997-10-09

1999-05-04

Nguyen, Hoang

Power plants

Pressure fluid source and motor

Apparatus having means responsive to or ameliorating the...

91363A, 91387, 91461, F16D 3102

Patent

active

058990640

ABSTRACT:
The present invention provides a servo-actuator capable of operating in both the Fail Safe and Fail Operate modes. In the Fail Safe mode, a pretensioned spring member moves a jet pipe in the servo-valve to cause said actuator rod to move in a first direction upon loss of electric power. A mechanical feedback means coupled to said spring member and said actuator rod opposes the force applied by the spring so that when a force equilibrium is reached the actuator rod will be at a predetermined position.

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