Steam Boilers, Engines, Nozzles and Turbines
Carbonization of coal is the process of

Heating wood in a limited supply of air at temperatures below 300°C
Binding the pulverized coal into briquettes
Strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
Pulverizing coal in inert atmosphere

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Steam Boilers, Engines, Nozzles and Turbines
The function of a valve rod is

To convert rotary motion of the crankshaft into to and fro motion of the valve rod
To provide reciprocating motion to the slide valve
To convert reciprocating motion of the piston into rotary motion of the crank
To provide simple harmonic motion to the D-slide valve

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