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

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Steam Boilers, Engines, Nozzles and Turbines
For water, at pressures below atmospheric;

Melting point drops slightly and boiling point drops markedly
Melting point drops slightly and boiling point drops slightly
Melting point rises slightly and boiling point drops markedly
Melting point rises markedly and boiling point drops markedly

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