(under subclass 118) Subject matter wherein the flow material guide or restrictor is movable with respect to the walls of the flow passage.
(1) Note. For the purposes of this and indented subclasses the distinction between a movable restrictor and the valve is that in any of the normally occurring positions of a restrictor fluid will still flow. If in any normally occurring position the flow is completely arrested, the device is not a restrictor but a valve. However, the distinction cannot be made in many instances, and movable flow restrictors are frequently considered valves in this class. See the class definition.
(2) Note. The movable restrictors of this subclass are
either movably mounted or floating in the flow path or connected to a movable part of the valve, or made of resilient material.
(3) Note. Guides which extend along a flow path from a valve head to keep the valve in alignment with its seat are not considered restrictors unless modified to control flow or turbulence, but are classified on the basis of the valve or its actuator or other appropriate basis.
SEE OR SEARCH THIS CLASS, SUBCLASS:
215+, and 264+, for screw actuators for valves. SEE OR SEARCH CLASS
137, Fluid Handling,
497+, for reaction members operating line condition responsive valves, the effect of such members being generally flow restricting, per se, subclass 525 for resilient material valves responding directly to line pressure and subclasses 613+ for distribution systems comprising a single flow path with plural serial valves and/or closures.
138, Pipes and Tubular Conduits,
43, 45 and 46 for pipes with variable flow restrictors.