Steam Boilers, Engines, Nozzles and Turbines
The principal function of a stop valve is to

Increase the temperature of saturated steam without raising its pressure
Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit
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

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Steam Boilers, Engines, Nozzles and Turbines
When the inlet pressure of steam is equal to the exit pressure, then

Pressure drops and fluid flows through the nozzle
There is no pressure drop and fluid does not flow through the nozzle
Fluid flows through the nozzle
There is a pressure drop in the nozzle

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Steam Boilers, Engines, Nozzles and Turbines
The equivalent evaporation of a boiler is a measure to compare

Any type of boilers operating under any conditions
The given boiler with the model
The two different boilers of the same make
Two different makes of boilers operating under the same operating conditions

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