Inlet and Exhaust valve are high-precision engine components
Their role is controlling the flow of gases in the diesel engine.
The inlet valves seal the intake port , through which the air flows into
the combustion chamber and exhaust valve control the flow of combustion
gases and let them stream out after the combustion cycle.
BI METAL VALVE
The head of the valve are made up of austenitic steel and will sustain corrosion.
The stem of the valve are made up of martensitic steel.
Extra hardness can be induced in the tip and a bi-metal valve lengthens the valve running time.
Nitrided process is done on the valve to increase the wear
In a nitrided valve the micro hardness is
higher than the stainless steel base material.
Keeping good ductility beneath the hard nitrated layer,Surface finish is smoother.
Chrome plating on the stem increases the wear resistance.
Which is significant for maintaining the clearance between stem and guide.
It also increase the corrosion resistance of the valve.
SEAT & TIP STELLITE
The Stellite Valve display astounding hardness and toughness,
and are also usually very resistant to corrosion.
It also increases the resistance against wear.
These kind of Engine Valves are specially made for Tractor Engines.