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

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

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Steam Boilers, Engines, Nozzles and Turbines
Blow off cock in a boiler is used to

Increase the temperature of saturated steam without raising its pressure
Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required
Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler
Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit

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