(under subclass 25) Subject matter in which the auxiliary or pilot valve controlling the main valve is operated by a fluid responsive device.
SEE OR SEARCH THIS CLASS, SUBCLASS:
32, for latched pilot valves for fluid servo-motors with fluid pressure means to release the latch.
SEE OR SEARCH CLASS
137, Fluid Handling,
105, for such systems in which the pilot valve is itself controlled by the main valve. These are generally suction operated milker pulsators and subclasses 485+ for line condition change responsive valves having fluid actuated pilot valve means which responds to changing pressures or flow conditions in the line.
