Steam Boilers, Engines, Nozzles and Turbines
Gusset stays in a boiler are provided to

Avoid explosion in furnace
Prevent the bulging of flat surfaces
Support furnace freely from top
Prevent leakage of hot flue gases

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

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
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

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Steam Boilers, Engines, Nozzles and Turbines
The cylinder dimensions of a compound engine may be designed on the basis of

Equal temperature drop in each cylinder for economy of steam
Equal initial piston loads on all pistons for obtaining same size of piston rod, connecting rod etc. for all cylinders
All of these
Equal power developed in each cylinder for uniform turning moment

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