(under subclass 25) Subject matter in which the main valve is operated in one direction by a servo unit and another direction by a second servo unit.
(1) Note. The oppositely acting servo units of this subclass may constitute different sides of the same piston and further the pilot controls for the opposing servo units
may be utilized, as in a single reversing or four-way valve.
SEE OR SEARCH CLASS
91, Motors: Expansible Chamber Type, appropriate subclasses for servo-motors, per se.
137, Fluid Handling,
596.15, for supply and exhaust valves operated by plural servo-motors controlled by a single pilot valve, and subclass 625.63 for supply and exhaust multiway valve units operated by plural servo-motors controlled by a single pilot valve.
