US PATENT SUBCLASS 251 / 118
WITH MATERIAL GUIDE OR RESTRICTOR

Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

118WITH MATERIAL GUIDE OR RESTRICTOR {6}
119  DF  .~> Aspirated stem drain
120  DF  .~> Movable or resilient guide or restrictor {1}
123  DF  .~> Valve at point of greatest restriction {1}
125  DF  .~> Drop forming restrictor
126  DF  .~> Spiral guide or spiral restrictor
127  DF  .~> Baffle or zigzag flow restrictor

DEFINITION

Classification: 251/118

(under the class definition) Subject matter wherein a restrictor or material flow guide other than a nozzle or outlet shape is provided in series with a valve.

(1) Note. Since some restrictors, especially movable or adjustable types, differ from valves only in the intended use, the search should be continued in various serial valve categories. See especially the search notes in section 23 of the class definitions of Class 222, Dispensing.

(2) Note. Many of these restrictors have silencing as their chief purpose.

SEE OR SEARCH THIS CLASS, SUBCLASS:

33+, for valves actuated by choked pressure type servo-motors, especially subclass 37 for such valves having a choke or restrictor in the main line.

216, for screw threads in a flow passage which will have inherently restricted properties.

SEE OR SEARCH CLASS 137, Fluid Handling,

171+, for fluid separating outlets in diverse fluid containing pressure systems especially subclasses 175+ for restricted gas bleed passages, subclasses 436+ for float arm operated valves combined with flow guides or restrictors, usually with a silencing function, subclasses 544+ for filters, many of which have structure similar or analogous to restrictors and guides. Where an element which has the structure of a filter is used for removing particles of solids from the flow stream classification is in the filtering subclasses, but a similar device to silence a flow stream, prevent turbulence or to modify a carbonated liquid is classified as a restrictor in subclasses 118.01+, subclasses 590+ for distribution systems comprising a tank with an internally extending flow guide, subclass 781 for expansible chamber devices with flow restrictors and subclass 802 for outlet shapes which may have a restricting effect, and see the search notes thereto.

138, Pipes and Tubular Conduits,

40+, for flow restrictors in pipes and tubular conduits and subclass 46.5 for pipes with discharge deflectors.

166, Wells,

91.1, for well heads with chokes or beans.

193, Conveyors, Chutes, Skids, Guides, and Ways,

32, for conveyor chutes with retarders.

222, Dispensing,

547, and 564 for dispensers having internal flow restrictors.

239, Fluid Sprinkling, Spraying, and Diffusing, 380+, 399+, 461+, 553+, 575, and 590+ for spray nozzles combined with whirlers or other restrictors in the flow line or with external deflectors.