Steam Boilers, Engines, Nozzles and Turbines
The function of an eccentric rod is

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

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Steam Boilers, Engines, Nozzles and Turbines
In recuperative air preheaters, the heat is transferred

Heat is transferred by bleeding some gases from furnace
From a metal wall from one medium to another
From heating an intermediate material and then heating the air from this material
By direct mixing

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