US PATENT SUBCLASS 251 / 206
.~ Different sized bores in valve head

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

205  DF  WITH SELECTIVE FLOW REGULATION {2}
206.~ Different sized bores in valve head {1}
207  DF  .~.~> Rotary plug

DEFINITION

Classification: 251/206

(under subclass 205) Devices in which the means for varying the flow includes a plurality of passages through the valve head each being of a different size from the others.