US PATENT SUBCLASS 137 / 247.23
.~.~.~.~.~ Seats vertically up

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

247  DF  WITH LIQUID VALVES OR LIQUID TRAP SEALS {3}
247.11  DF  .~ Liquid seal in liquid flow line; flow liquid forms seal {8}
247.13  DF  .~.~ Valves {1}
247.15  DF  .~.~.~ Line condition change responsive {3}
247.21  DF  .~.~.~.~ Ball valve {1}
247.23.~.~.~.~.~ Seats vertically up

DEFINITION

Classification: 137/247.23

(under subclass 247.21) Apparatus having a seat lying in a general horizontal plane above the valve.

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519.5, for ball valves which are weight biased open.