What is Engine Valve Nomenclature?

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Engine Valve Nomenclature:

Most engine valves are designed as poppet style valves due to their up and down popping motion and have a conical profile valve head that matches against a machined valve seat to seal off the passage of fluids or gases. They’re also called mushroom valves thanks to the distinctive shape of the valve head. The figure shows the nomenclature for the various elements in an exceedingly typical engine valve.

The two primary elements are the valve stem and therefore the valve head. The pinnacle contains a fillet that leads into a seat face that’s machined at a specified angle to match the machining of the valve seat to which it’ll match. The seating of the valve face to the valve seat is what provides the seal for the valve against combustion pressure.

The valve stem connects the valve to the mechanical elements within the engine that operate the valve by creating a force to maneuver the stem against the seating pressure provided by a valve spring. The keeper groove is employed to carry the spring in position, and therefore the tip of the valve stem is repeatedly contacted by a valve rocker, tappet, or lifter that actuates the valve.

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