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

To provide simple harmonic motion to the D-slide valve
To provide reciprocating motion to the slide valve
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

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Steam Boilers, Engines, Nozzles and Turbines
A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are

Supplied mounted on a single base
Packaged boiler does not exist
Purchased from several parties and packed together at site
Supplied by same manufacturer loose and assembled at site

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