US PATENT SUBCLASS 123 / 90.12
.~ Hydraulic system

Current as of: June, 1999
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123 /   HD   INTERNAL-COMBUSTION ENGINES

90.1  DF  POPPET VALVE OPERATING MECHANISM {19}
90.12.~ Hydraulic system {1}
90.13  DF  .~.~> With manifold and distributor

DEFINITION

Classification: 123/90.12

(under subclass 90.1) Device wherein a liquid under pressure provides an essential link in the valve operating mechanism for at least one direction of movement of the valve.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

12+, for a valve of more general utility which is opened or closed by fluid pressure.