Control system for a limited stall load activator

Details Control system for a limited stall load activator Control system for a limited stall load activator

1997-03-07

1998-07-07

Denion, Thomas E.

Motors: expansible chamber type

With motive fluid valve

Both inlet and exhaust controlled by motive fluid pressure...

91446, 91448, 91469, F15B 1110

Patent

active

057751986

ABSTRACT:
A control system (10) for a limited stall load actuator (60) comprises a servo pressure regulator (20), solenoid valve (40), relief valve (30) and a shuttle valve (50) connected with a piston actuator 60 such that when source pressure P1 is declining the servo pressure regulator (20) will open to permit more flow and maintain a minimum actuation force effected by the actuator (60), and should there occur a failure of the servo pressure regulator (20) that would permit high source pressure to be communicated to the control system (10), the relief valve (30) will operate to limit the amount of high pressure communicated to the control system (10) such that the actuator (60) will attain no greater than a predetermined maximum output force.

REFERENCES:
patent: 3874269 (1975-04-01), Walters
patent: 4210165 (1980-07-01), Kitsugi
patent: 4555977 (1985-12-01), Motzer
patent: 5351601 (1994-10-01), Zeuner

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