US PATENT SUBCLASS 137 / 115.17
.~.~.~.~.~ Increasing pressure progressively closes then reopens by-pass or relief valve

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

87.01  DF  SELF-PROPORTIONING OR CORRELATING SYSTEMS {8}
109  DF  .~ Self-controlled branched flow systems {4}
115.01  DF  .~.~ Bypass or relief controlled by main line fluid condition {3}
115.13  DF  .~.~.~ Pressure responsive {9}
115.16  DF  .~.~.~.~ Bypass or relief valve biased open {1}
115.17.~.~.~.~.~ Increasing pressure progressively closes then reopens by-pass or relief valve

DEFINITION

Classification: 137/115.17

Increasing pressure progressively closes then reopens bypass or relief valve:

(under subclass 115.16) Subject matter wherein the increase in the fluid pressure progressively closes the bypass or relief valve and reopens at still higher pressure.