Safety valve
used with locomotive boilers is operated by:
Spring
Dead weight
High steam
and low water
Lever
Spring
Safety valve is
a type of valve that automatically actuates when the pressure of inlet
side of the valve increases to a predetermined pressure, to open
the valve disc and discharge the fluid (steam or gas) and when the
pressure decreases to the prescribed value, to close the valve disc
again. It is operated by the spring in locomotive boilers.
Hence, the
correct option is (A).
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