US PATENT SUBCLASS 137 / 527.2
.~.~.~ Head retained by removable closure

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}
527.2.~.~.~ Head retained by removable closure

DEFINITION

Classification: 137/527.2

(under subclass 527) Devices in which the valve casing is provided with a removable closure element which retains the valve head in assembled relation with its seat.