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The capacity of a safety valve is measured by the amount of steam that can be discharged per ___.

Scale is caused by ___.

A ___ valve is a valve that allows fluid to flow by raising or lowering a valve disc against a seat.

A ___ valve is a valve that allows fluid to flow by raising or lowering a valve disc against a seat.

Boiler ___ is a condition that occurs when a boiler is operating at or above its maximum allowable working pressure.

Scale is caused by ___.

A(n) ___ sensor is a flame sensor that senses light frequencies that are higher than those visible to the eye.

A(n) ___ test is the most accurate method of testing a low water fuel cutoff.

Boiler ___ is a condition that occurs when a boiler is operating at or above its maximum allowable working pressure.

A(n) ___ sensor is a flame sensor that senses light frequencies that are higher than those visible to the eye.