Exhaust Valve Spindle

Exhaust valves are a integral part of a Internal combustion engine as they control the flow of burned gases from a cylinder into the exhaust manifold. In modern two stroke marine engines these valves are controlled by hydraulic systems. To endure high pressure , temperature and stress they are made up of molybdenum chrome alloy with a layer of stellite welded onto the seating face. Or alternatively a heat resistant nimonic alloy valve head, friction welded to an alloy steel shaft.
Further the valve spindle is fitted with a winged valve rotatory. The kinetic energy in the exhaust gas rotates the valve a small amount as it passes. This keeps the valve at an even temperature and helps reduce the build up of deposits on the valve seat.

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