Steam Boilers, Engines, Nozzles and Turbines
The feed check valve is used in order to

Allow high pressure feed water to flow to drum and not allow reverse flow to take place
Recirculate unwanted feed water
Regulate flow of boiler water
Check level of water in boiler drum

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

To keep the engine speed uniform at all load conditions
To convert reciprocating motion of the piston into rotary motion
To convert rotary motion of the crankshaft into to and fro motion of the valve rod
To prevent fluctuation of speed

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