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
Check level of water in boiler drum
Regulate flow of boiler water

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Steam Boilers, Engines, Nozzles and Turbines
The function of a piston in a steam engine is

To guide motion of the piston rod and to prevent it from bending
To transfer motion from the piston to the cross-head
None of these
To convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment

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