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

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

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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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