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

Check level of water in boiler drum
Recirculate unwanted feed water
Regulate flow of boiler water
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 difference between Cornish boiler and Lancashire boiler is that

Former is water tube type and latter is fire tube type
None of the listed here
Former contains one fire tube and latter contains two fire tubes
Former is fire tube type and latter is water tube type boiler

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