A. Open it once or twice a day to see that it is in good order.
Q. Of what use is a check valve?
A. To prevent the water in boiler from returning into the pump or injector.
Q. What effect has cold water on hot boiler plates?
A. It will fracture them.
Q. How should the gauge cocks be located on a boiler?
A. So that the lowest gauge cock is about 1½ inches above the top row of flues.
Q. Where should the blow-off valve be located?
A. At the bottom of the fire box in locomotive style of boiler, or in the mud drum when used.
Q. How would you have check valve arranged?