US PATENT SUBCLASS 251 / 216
.~.~ Screw threads in flow path

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

213  DF  MECHANICAL MOVEMENT ACTUATOR {10}
215  DF  .~ Plural motions of valve {5}
216.~.~ Screw threads in flow path

DEFINITION

Classification: 251/216

(under subclass 215) Devices in which the thread element of at least one part of the screw is structurally a part of the valve controlled passage so that it is contacted by the fluid in the passage.