(under subclass 272) Apparatus in which the riser serves as the actuator for the valve, i.e., movement of the riser in a predetermined manner actuates the valve.
SEE OR SEARCH THIS CLASS, SUBCLASS:
274, for spout-operated valves in water cranes.
275+, for rotating risers having laterally extending spouts.
616+, for distribution systems in which an articulated or swinging flow conduit actuates the valve, and see the search notes thereto.
SEE OR SEARCH CLASS
251, Valves and Valve Actuation, 341+, and 349+ for valves operated by moving the casing or an extension thereof, including inlets and outlets.
