US PATENT SUBCLASS 137 / 505.12
.~.~.~ Multi-stage


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}
505.12.~.~.~ Multi-stage


DEFINITION

Classification: 137/505.12

(under subclass 505) Devices in series with another line pressure responsive valve to produce plural stage reduction.

SEE OR SEARCH THIS CLASS, SUBCLASS:

512+, for plural serial direct response, reducing valves.