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
Regulate flow of boiler water
Recirculate unwanted feed water
Check level of water in boiler drum

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Steam Boilers, Engines, Nozzles and Turbines
Coke is produced by

Enriching carbon in the coal
Pulverizing coal in inert atmosphere
Heating wood in a limited supply of air at temperatures below 300°C
Strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel

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