Valves and valve actuation – Lost motion between actuator and valve
Patent
1999-01-22
2000-08-01
Rivell, John
Valves and valve actuation
Lost motion between actuator and valve
251 76, 25112902, 25112911, 251250, F16K 3104
Patent
active
06095485&
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 which is attachable to the valve housing of the valve, a motor mounted on the housing, a pinion gear which is coupled to the motor by a shaft, the pinion gear being drivable by the motor via the shaft. The device further has a rack including a body having an end portion which is engageable with the valve stem of the valve and a longitudinal cutout along a side of the rack. The rack is moveable between a first position in which the valve is in its open position and a second position in which the end portion of the rack engages the valve stem for maintaining the valve stem in its closed position. The device further includes a rack segment slidably mounted within the longitudinal cutout of the rack, the rack member having a length which is less than a length of the longitudinal cutout, the pinion gear engaging the rack member for slidably moving the rack segment between a top and a bottom of the longitudinal cutout. When the rack segment engages the bottom of the cutout, the rack segment moves the rack to the second position for closing the valve. The device also includes a spring mechanism for biasing the rack in the 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
Castle Robert W.
Lebkuchner Benno
Honeywell International , Inc.
Rivell John
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