US PATENT SUBCLASS 137 / 454.5
.~ Threaded into valve casing

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

454.2  DF  REMOVABLE VALVE HEAD AND SEAT UNIT {3}
454.5.~ Threaded into valve casing

DEFINITION

Classification: 137/454.5

(under subclass 454.2) Devices in which the seat carrying portion is threadably secured in the valve casing.