US PATENT SUBCLASS 251 / 211
SERIAL ALTERNATELY CLOSED PORTS


Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

211SERIAL ALTERNATELY CLOSED PORTS


DEFINITION

Classification: 251/211

(under the class definition) Valve units comprising a single flow path provided with a pair of serially arranged seat members with which plural seat-engaging elements of a single valve head alternately cooperate.