US PATENT SUBCLASS 137 / 527.4
.~.~.~ Valve head movably connected for accommodation to seat

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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
511  DF  .~ Direct response valves (i.e., check valve type) {14}
527  DF  .~.~ Pivoted valves {4}
527.4.~.~.~ Valve head movably connected for accommodation to seat

DEFINITION

Classification: 137/527.4

(under subclass 527) Devices in which the mounting of the valve permits motion of the valve head, in addition to pivoting, in order to allow the head to adjust itself to the valve seat.