US PATENT SUBCLASS 91 / 433
.~ Both inlet and exhaust controlled by motive fluid pressure in supply line or chamber

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

418  DF  WITH MOTIVE FLUID VALVE {32}
433.~ Both inlet and exhaust controlled by motive fluid pressure in supply line or chamber {1}
434  DF  .~.~> With manual valve actuating means responsive to motive fluid pressure (e.g., "feel")

DEFINITION

Classification: 91/433

(under subclass 418) Apparatus in which the valve means controls both the inlet and the exhaust to initiate flow of motive fluid to and from a single working chamber of the motor and the valve means is operated in response to variations in the pressure in either the pressure line supplying motive fluid to the motor or the working chamber or the motor itself to control both the inlet and exhaust of motive fluid.

(1) Note. The valve means controlling the inlet and the exhaust in response to variations in the pressure is an inlet and exhaust valve.

(2) Note. The motive fluid which operates the valve means must also be subject to the control of the valve means.

(3) Note. The variations in pressure in the supply line or working chamber may be caused by any condition including a manually operable means such as a throttle valve in the pressure line or by changes in the load on the motor so long as the inlet and exhaust are both valved by a means which itself operates by variations in pressure applied thereto.

SEE OR SEARCH THIS CLASS, SUBCLASS:

166, for double acting motor having valve means for reversing the direction of operation of the motor in response to motive fluid pressure variations.

356, for reciprocating motors which operate through a complete cycle and then stop, the reversal of the motor being controlled in response to motive fluid pressure change. 420, for a double acting motor in which the contracting chamber exhaust valve is controlled by the pressure in or

flow to the expanding chamber.

421, for a double acting motor in which the expanding chamber inlet is controlled by the pressure in or flow from the contracting chamber.

461, for pilot valves which are operated by motive fluid which is controlled separately from that supplied directly to the motor.