| 摘要 |
A pair of piston valve members are slidably mounted in a housing rotatably engaging the output shaft of the automatic transmission. A first piston valve moves freely under the influence of centrifugal force within the housing to throttle line pressure from a pump in the transmission to a governed pressure level used for performing shifting functions within the transmission and the second piston valve member is spring biased against the influence of centrifugal force to prevent its movement under the influence thereof until a predetermined output shaft speed is reached whereupon it throttles the line pressure supplied by the transmission pump and directs it to a portion of the first piston valve to vary the operation thereof upon further increases in output shaft speed. The piston valves are arranged so that no mechanical connection between them is required to effect the two-stage operation and venting of fluid from each of the valves is effected in an outward direction to permit discharge of the contaminants under the influence of centrifugal force.
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