US PATENT SUBCLASS 137 / 505.11
.~.~.~ With relief valve

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}
505.11.~.~.~ With relief valve

DEFINITION

Classification: 137/505.11

(under subclass 505) Devices having a port leading from the low pressure side of the valve to waste and controlled by a normally closed pressure responsive valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

102, for correlated supply and exhaust valves.

116.3+, for correlated supply and by-pass or relief valves.