US PATENT SUBCLASS 137 / 243
.~.~.~ Valve grinding motion of valve on seat

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

237  DF  WITH CLEANER, LUBRICATION ADDED TO FLUID OR LIQUID SEALING AT VALVE INTERFACE {2}
238  DF  .~ Cleaning or steam sterilizing {4}
242  DF  .~.~ Mechanical cleaning {2}
243.~.~.~ Valve grinding motion of valve on seat {6}
243.1  DF  .~.~.~.~> Concentric stem
243.2  DF  .~.~.~.~> Spring pressed
243.3  DF  .~.~.~.~> Lost motion permits grinding
243.4  DF  .~.~.~.~> With swivel-preventing means
243.5  DF  .~.~.~.~> Nut releasable from body and/or stem
243.6  DF  .~.~.~.~> With independent grinding actuator {1}

DEFINITION

Classification: 137/243

(under subclass 242) Systems in which the fluent material system or a part thereof has means for giving the valve or its seat a motion which produces cleaning or grinding of the valve and/or its seat.

(1) Note. This motion must be one not contemplated or normally occurring in the fluid controlling movement of the valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

240, for this subject matter wherein a separate material (e.g., grinding compound) is added at the grinding zone.

330+, for other nonvalving motion of valves or valve seats.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation, 215+, for plural motions of mechanically actuated valves.

451, Abrading,

115+, for grinding a valve on a seat by use of plural

workholders, without an abrading tool.