Valve Lift
Valve lift is the distance between
the top of the valve plate and the bottom of the valve guard when the
valve plate is seated against the valve seat. Valve lift effects lift
area, and adjusted equivalent area. Higher lift valves are more efficient
(larger equivalent flow areas), but are not as durable as lower lift valves
due to the higher impact forces (more time for acceleration of the valve
plate).
The maximum valve lift for metallic
valve plates is 0.063 inches. The maximum valve lift for non-metallic
valve plates (PEEK, Nylon, MT) is 0.112 inches. Non-metallic valve plates
are lighter weight, and therefore do not generate as much impact force
at higher lift as metallic valve plates.
Ariel
Corporation Application Manual
14-Jul-98