(under the class definition) Apparatus in which a tool or tool shaft is provided with a passage and means movable relative to said tool or tool shaft for regulating or controlling the flow of fluent material through said passage while the tool or tool shaft is positioned below ground.
SEE OR SEARCH THIS CLASS, SUBCLASS:
218+, for a valve in combination with above ground means for handling fluid or cuttings.
232+, for means movable relative to tool below ground to stop flow toward bore bottom.
247+, for fluid pressure responsive means to remove core receiver or operate a receiver latch.
250+, for passage control means in a fluid actuated core retaining or severing means.
267+, for passage control means in a means to laterally shift a cutter element by fluid pressure. 271+, for passage control means in a latch operated by fluid pressure or dropped element.
296+, for passage control means in a fluid operated below ground hammer or impact device.
SEE OR SEARCH CLASS
166, Wells,
107+, and 162+ for well fluid receptacles which include valves and subclasses 316+ for below ground valves peculiar to wells.
