US PATENT SUBCLASS 123 / 90.14
.~ Pneumatic system

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

90.1  DF  POPPET VALVE OPERATING MECHANISM {19}
90.14.~ Pneumatic system

DEFINITION

Classification: 123/90.14

(under subclass 90.1) Device wherein positive or negative pressure of a gas provides the source of power for at least one direction of movement of the valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

90.32, for a pneumatically-controlled interruption in the drive train of a valve that is not pneumatically actuated.

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.