US PATENT SUBCLASS 137 / 247.21
.~.~.~.~ Ball valve

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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.~.~.~.~ Ball valve {1}
247.23  DF  .~.~.~.~.~> Seats vertically up

DEFINITION

Classification: 137/247.21

(under subclass 247.15) Apparatus in which the valve is a substantially spherical element.

SEE OR SEARCH THIS CLASS, SUBCLASS:

409+, especially subclasses 433 and 449 for float responsive ball valves.

519.5, for weight biases open direct response valves of the ball type.

533.11, for a weight biased ball check valve.

539+, for a spring biased ball check valve.