US PATENT SUBCLASS 137 / 505.23
.~.~.~.~ Modified valve casing

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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
494  DF  .~ With separate connected fluid reactor surface {8}
505  DF  .~.~ With opening bias (e.g., pressure regulator) {13}
505.22  DF  .~.~.~ Through external pipe {2}
505.23.~.~.~.~ Modified valve casing

DEFINITION

Classification: 137/505.23

(under subclass 505.22) Devices in which the valve casing is modified to receive the external pipe.