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

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

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Steam Boilers, Engines, Nozzles and Turbines
The main object of a boiler trial is

To prepare heat balance sheet for the boiler
To determine the thermal efficiency of the boiler when working at a definite pressure
All of these
To determine the generating capacity of the boiler

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