US PATENT SUBCLASS 417 / 311
.~.~ Adjustable spring loaded valve

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

Internet Version by PATENTEC © 1999      Terms of Use


417 /   HD   PUMPS

279  DF  WITH CONDITION RESPONSIVE PUMPED FLUID CONTROL {22}
307  DF  .~ Pressure responsive relief or bypass valve {4}
311.~.~ Adjustable spring loaded valve

DEFINITION

Classification: 417/311

(under subclass 307) Apparatus in which the fluid control means comprises a valve which is biased to a closed position by means of a spring and means are provided for varying the bias of the spring.