Steam Boilers, Engines, Nozzles and Turbines
The cylinder dimensions of a compound engine may be designed on the basis of

Equal temperature drop in each cylinder for economy of steam
Equal power developed in each cylinder for uniform turning moment
Equal initial piston loads on all pistons for obtaining same size of piston rod, connecting rod etc. for all cylinders
All of these

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

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