(under subclass 358) Apparatus in which means responsive to fluid pressure is connected to operate or modify the operation of the valve means by fluid pressure variations created in response to the position of the working member.
(1) Note. The fluid pressure for operating the valve means in response to the position of the working member may be motive fluid from the motor or fluid from a separate supply.
(2) Note. A valve means which is operated by fluid pressure variations which are created in the motive fluid merely by the working member engaging the end of the chamber in which it is working or by a mere variation in the load are excluded, see subclass 433 and the search there noted for such devices.
SEE OR SEARCH THIS CLASS, SUBCLASS:
403, for expansible chamber motors having a fluid actuated valve in which the valve actuating fluid is controlled in response to the working member position and which does not involve a feedback means.
460, and 461, for expansible chamber motors having a pulsator operated valve or a pilot valve, respectively.
