US PATENT SUBCLASS 137 / 115.12
.~.~.~.~ Flapper

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}
115.03  DF  .~.~.~ Flow rate responsive {7}
115.12.~.~.~.~ Flapper

DEFINITION

Classification: 137/115.12

Flapper:

(under subclass 115.03) Subject matter wherein the sensor includes a member supported at one end and moving by the momentum of the fluid in the flow line to operate the bypass or relief valve.