Steam Boilers, Engines, Nozzles and Turbines
The principal function of a stop valve is to

Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
Increase the temperature of saturated steam without raising its pressure
Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required

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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 convert rotary motion of the crankshaft into to and fro motion of the valve rod
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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