(under subclass 33) Subject matter in which a flow resistance or choke device is serially connected with and separate from the valve in the main flow line.
(1) Note. This choke serves to regulate further the rate of flow in the main flow line over and above the regulation provided by the choked pressure type of servo-motor.
(2) Note. Where the restrictor is attached to and moves with the movable element of the main valve, classification is in the appropriate one for either the valve or the valve actuator.
SEE OR SEARCH THIS CLASS, SUBCLASS:
24, for fluid actuated valves which are Venturi or line flow effect assisted.
118+, for valves having restrictors in series therewith.
SEE OR SEARCH CLASS 137, Fluid Handling,
219+, for Larner-Johnson valves, which are associated with and have a seat formed at a restriction in the line,
subclasses 436+ for float operated valves having a restrictor and subclasses 500+ for line condition change responsive valves having expansible chamber reactor surface subject to the differential effects resulting from an obstruction in the line.
