Fail-safe electric hydraulic actuator

Details Fail-safe electric hydraulic actuator Fail-safe electric hydraulic actuator

F - Mech Eng,Light,Heat,Weapons

15

B

F15B 13/043 (2006.01) F15B 15/06 (2006.01) F15B 15/08 (2006.01) F15B 15/18 (2006.01) F15B 15/24 (2006.01) F15B 20/00 (2006.01) F16K 31/06 (2006.01)

Patent

CA 2254336

An electro-hydraulic valve actuator comprising an actuator casing; a piston/rack means in the casing having walls reciprocating linearly to effect linear movements, the reciprocating walls defining a center chamber therebetween and two outside chambers inside the casing; an output shaft in communication with the piston/rack means for driving a valve, the output shaft effecting rotational movements in response to the linear movements of the piston/rack means; resilient return means in each of the two outside chambers engaging the reciprocating walls of the piston/rack means and inner end walls of the casing, the resilient return means biasing the walls of the piston/rack means to a closed position; a pumping means; a primary internal flow path for transferring hydraulic fluid from the pumping means to a first output port and into the center chamber, the hydraulic fluid in the center chamber causing the piston/rack means to expand in the casing to transmit the linear movements to the output shaft; and a fail-safe solenoid valve system having a secondary internal flow path connecting to and extending from the primary internal flow path to a second outlet port opening into at least one of the outside chambers, and a normally closed solenoid valve in the secondary flow path preventing flow through the secondary internal flow path. Upon loss of power to the actuator, the fail-safe solenoid valve opens to thereby cause the resilient return means to force hydraulic fluid out of the center chamber, through the primary and secondary internal flow paths, into at least one of the outside chambers, so that the piston/rack means is returned to a closed position for rotating the output shaft to drive the valve.

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