(under subclass 118) Subject matter wherein the restrictor comprises a contracted portion of the flow line and the valve is located at the point of greatest constriction of the flow line.
SEE OR SEARCH THIS CLASS, SUBCLASS:
24, for fluid actuated or retarded valves which are Venturi or flow line effect assisted.
37, for choked fluid pressure type servo-motor valve actuators with a main line having a choke or restriction.
SEE OR SEARCH CLASS
137, Fluid Handling,
219+, for Larner-Johnson valves, i.e., expansible chamber or internal telescoping valves, which are seated at a point of restriction in the line, subclasses 436+ for float operated valves having a restrictor, subclass 487 for pilot or servo control of a condition change responsive valve controlled by pressure differentials across the flow line valve, subclasses 500+ for condition responsive devices having separate connected reactor surface means responsive to rate of fluid flow, usually measured across a restriction and subclass 515 for drill pipe check valves.
