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

To transfer motion from the piston to the cross head
To exhaust steam from the cylinder at proper moment
To convert heat energy of the steam into mechanical work
To guide motion of the piston rod and to prevent it from bending

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

To indicate the water level inside the boiler to an observer
To blow off steam when the pressure of steam inside the boiler exceeds the working pressure
None of these
To measure pressure of steam inside the steam boiler

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