The principal function

Question

The principal function of a stop valve is to

Options:

A . control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required

B . empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler

C . put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit

D . increase the temperature of saturated steam without raising its pressure

Answer: Option A

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