Valves, valve seat inserts, and valve guides

Valves, valve guides, and valve seat inserts work as an assembly to seal off the combustion chamber within the valve train. While the valve and valve seat insert perform the actual sealing function, the valve guide supports the motion of the valve.

MAHLE manufactures intake and exhaust valves in forged and hot-extruded versions in a multitude of materials for gasoline and diesel engines of every size. Depending on stress levels, the valves can be reinforced around the seat, hardened, nitrided, or chrome-plated. The engineers especially focus on the corrosion and high-temperature fatigue behavior of the valves. After all, exhaust valves in commercial vehicle engines must withstand more than one billion opening and closing operations at temperatures of up to 800°C.

Additional components in this assembly include the valve stem seal, the valve spring, and the top and bottom valve spring retainer.