Power plants – Pressure fluid source and motor – Apparatus having means responsive to or ameliorating the...
Patent
1997-11-18
1999-09-14
Ryznic, John E.
Power plants
Pressure fluid source and motor
Apparatus having means responsive to or ameliorating the...
60406, 91440, 92 69R, 92163, 92138, 92130A, F16D 3102, F01B 702, F01B 3100
Patent
active
059504277
ABSTRACT:
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 reciprocating 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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Bernard Steven P.
Demerjian, Jr. Paul D.
Robbie Douglas A.
Ryznic John E.
Worcester Controls Licensco, Inc.
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