US PATENT SUBCLASS 210 / 117
.~.~ Check valve controlled

Current as of: June, 1999
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210 /   HD   LIQUID PURIFICATION OR SEPARATION

97  DF  FLOW, FLUID PRESSURE OR MATERIAL LEVEL, RESPONSIVE {14}
109  DF  .~ Discharge of treated material {5}
117.~.~ Check valve controlled {2}
118  DF  .~.~.~> Non-closing, e.g., sand valve
119  DF  .~.~.~> Float type

DEFINITION

Classification: 210/117

(under subclass 109) Apparatus including flow control means allowing flow in only one direction.

SEE OR SEARCH THIS CLASS, SUBCLASS:

137, for means maintaining stream pressure or flow in separatory apparatus.