A valve (as in an internal combustion engine) which consists of a sliding shaft with a disk on the end (the disk being shaped to alternately plug and unplug a matching port) and which is operated by springs and possibly cams interacting with the shaft
a device that controls the rate of flow of fluid in a line or opens or shuts off the flow of fluid completely
Machined, self aligning valve that incorporates an elastomer to provide a positive seal upon disconnection, no low pressure leakage, and generally provides higher flow that a ball valve
a mushroom-shaped valve that rises perpendicular from its seat; commonly used in internal-combustion engines
A spring-loaded gas-distribution valve which consists of a mushroom-shaped device which is raised or lowered onto a seating over an opening
An intake or exhaust valve, operated by springs and cams, that plugs and unplugs its opening by axial motion