US PATENT SUBCLASS 251 / 87
.~ With single plane swing pivoted connection

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

84  DF  VALVE HEAD MOVABLY CONNECTED FOR ACCOMMODATION TO SEAT {4}
87.~ With single plane swing pivoted connection

DEFINITION

Classification: 251/87

(under subclass 84) Devices in which a pivotal connection permits the head to swing in one plane only.

(1) Note. The axis of the pivot is usually perpendicular to the axis of the valve stem.