US PATENT SUBCLASS 417 / 303
.~.~ Sequentially opened main line and bypass or relief paths

Current as of: June, 1999
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417 /   HD   PUMPS

279  DF  WITH CONDITION RESPONSIVE PUMPED FLUID CONTROL {22}
302  DF  .~ Plural paths having individual condition responsive control means {2}
303.~.~ Sequentially opened main line and bypass or relief paths

DEFINITION

Classification: 417/303

(under subclass 302) Apparatus wherein one of the condition responsive fluid flow paths comprises a normally closed main line path in the pump inlet or outlet, and another comprises a normally closed path in a relief or bypass passage, said paths provided with valve means operated by the condition responsive means to open the main line path before the opening of the other.