US PATENT SUBCLASS 137 / 614.21
.~.~ Coaxial oppositely directed seats

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

561 R  DF  SYSTEMS {32}
613  DF  .~ Flow path with serial valves and/or closures {7}
614.21.~.~ Coaxial oppositely directed seats

DEFINITION

Classification: 137/614.21

(under subclass 613) Systems in which two valve seats are provided in coaxial relationship, each seat having a separately actuatable head associated therewith.