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What is tappet in Engines

What is tappet? 

A tappet is a projection that imparts a linear motion to some other component
Tappet is basically a type of cup that creates seat for the valve stem and the valve return spring.
It provides a flat plane for the cam lobe. 
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Tappets 

What is valve? 

A valve is a component tha controls the flow of a fluid (gases, liquids, others) by opening, closing the passageways.

Valve materials? 

Inlet - Made by nickel-steel alloy, stellite facing. 
Exhaust - Made by silco-chrome steel alloy, seat is stellite coated, 
Some valves are made hollow and sodium is filled inside.
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