US PATENT SUBCLASS 137 / 860
.~.~.~ Annulus

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}
843  DF  .~.~ Resilient material valve {4}
860.~.~.~ Annulus

DEFINITION

Classification: 137/860

(under subclass 843) Valve wherein the resilient member is in the form of a ring which is carried by but not secured to a mounting and which either slides along or freely expands with respect to the mounting.

(1) Note. The ring does not need to be continuous, thus valves employing expansible or contractable split rings will be found herein.