Valve actuating device having a reduced impact operating mechani

Details Valve actuating device having a reduced impact operating mechani Valve actuating device having a reduced impact operating mechani

1998-03-24

1999-08-24

Hepperle, Stephen M.

Valves and valve actuation

Lost motion between actuator and valve

251 76, 25112911, 251250, F16K 3104

Patent

active

059415002

ABSTRACT:
A valve actuating device is provided for opening and closing a valve of the type having a valve housing, a valve member sealingly engageable with a valve seat formed in the valve housing, and a valve stem attached to the valve member for moving the valve member between a closed position and an open position. The valve actuating device includes a housing threadably attached to the valve housing of the valve, and a motor, mounted on the housing, for driving a shaft having a pinion gear upon activating the motor. The device further includes a rack having a body with an end portion thereof engageable with the valve stem of the valve, and a rack segment, disposed between the rack and the pinion gear, for moving the rack between a first position in which the end portion of the rack engages the valve stem for maintaining the valve stem in its closed position, to a second position in which the rack is moved by the rack segment upon activation of the motor via the pinion gear of the motor for opening the valve. The rack segment enables the motor to decelerate at a predetermined rate of speed without coming to an abrupt stop. A pair of springs is provided for biasing the rack to its first position.

REFERENCES:
patent: 2052987 (1936-09-01), Persons
patent: 2912215 (1959-11-01), Forrester
patent: 4318530 (1982-03-01), Lissmyr et al.
patent: 4551072 (1985-11-01), Barall
patent: 4807700 (1989-02-01), Wilkins
patent: 4836497 (1989-06-01), Beeson
patent: 5529282 (1996-06-01), Lebkuchner

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