Steam Boilers, Engines, Nozzles and Turbines
In accelerated circulation type boiler

Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
Feed pump is employed to supplement natural circulation in water wall type furnace
Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
Water is converted into steam in one pass without any recirculation

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

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 provide reciprocating motion to the slide valve
To convert reciprocating motion of the piston into rotary motion of the crank

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