(under subclass 251) Dispensers in which material being dispensed may be by-passed around the pump, forcer, movable trap chamber or other discharge assistant, either (1) from the inlet side thereof to the discharge side thereof, (2) from the discharge side thereof back to the inlet side, (3) from the discharge side back to the supply, or (4) any combination of the preceding.
SEE OR SEARCH THIS CLASS, SUBCLASS:
72, for volume or rate of flow meter by-pass arrangements.
108+, for drip, leakage, or waste catching or disposal, including return to supply.
330+, for discharge assistants having plural outlets not involving a by-pass or return to supply.
345+, for striking and clearing means for conveyor type and movable trap chambers. 375, for miscellaneous casing enclosed discharge assistants and provided with antileak or antisiphon means.
424, for miscellaneous dispensers not having discharge assistants provided with means to return material to the supply.
SEE OR SEARCH CLASS
137, Fluid Handling,
563+, for closed circulation type distribution systems subclass 565.35 for pump by-passes; subclasses 599+ for by-passes in fluid handling systems.
221, Article Dispensing,
159+, for article dispensing devices including means to orient the dispensed articles and having means to return to supply such articles as are not properly oriented.
239, Fluid Sprinkling, Spraying, and Diffusing,
90, and 124+ for spraying systems having means to bypass some of the fluid back to the supply, or to vent the system by permitting the fluid to escape to the atmosphere other than through the usual spray outlet.
406, Conveyors: Fluid Current,
105, for by-pass means around the fan.
417, Pumps, 279+, and 440+ for pumps with by-pass valves.
