Fluid handling – With indicator – register – recorder – alarm or inspection means – Position or extent of motion indicator
Patent
1993-04-30
1994-07-05
Rivell, John
Fluid handling
With indicator, register, recorder, alarm or inspection means
Position or extent of motion indicator
137554, 251 58, 251 60, 251250, 74422, F16K 3700
Patent
active
053258886
ABSTRACT:
An apparatus is provided which includes a valve transmission designed to connect a valve actuator to a rotational valve. The valve transmission includes a pinion, a pair of stepped racks, and a lower gear, all within a housing. The pinion is designed to be driven by a rotating shaft of an actuator. The pinion engages the teeth of the racks on the upper steps. The lower steps of the rack are displaced laterally from the upper steps to engage a lower gear that is either of lesser or greater diameter than the pinion depending on whether a positive or negative mechanical advantage is desired. The lower steps drive the lower gear which is connected to the drive shaft of a rotational valve. The transmission is placed within a housing which removeably mounts to the valve body.
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