US PATENT SUBCLASS 91 / 371
.~.~.~ With valve means limiting reaction pressure

Current as of: June, 1999
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91 /   HD   MOTORS: EXPANSIBLE CHAMBER TYPE

358 R  DF  WORKING MEMBER POSITION FEEDBACK TO MOTIVE FLUID CONTROL {12}
368  DF  .~ Follower type {9}
370  DF  .~.~ With motor chamber pressure reaction on valve {2}
371.~.~.~ With valve means limiting reaction pressure

DEFINITION

Classification: 91/371

(under subclass 370) Apparatus in which an additional valve means is provided for controlling the application of fluid to the means responsive to fluid pressure, said additional valve means also being responsive to fluid pressure of a predetermined magnitude (1) to limit the pressure of the fluid applied to the means responsive to fluid pressure or (2) to change the proportion of the fluid pressure in the working chamber applied to the means responsive to fluid pressure when the working chamber pressure rises above the

predetermined magnitude.