A. The plunger displaces the air in the water pipe, causing a vacuum which is filled by the atmosphere forcing the water therein; the receiving valve closes and the plunger forces the water out through the discharge valve.
Q. What is the most economical boiler-feeder?
A. The (Trix) Exhaust Injector.[8]
Q. What economy is there in the Exhaust Injector?
A. From 15 to 25 per cent saving in fuel.
Q. Where is the best place to enter the boiler with the feed water?
A. Below the water level, but so that the cold water can not strike hot plates. If injector is used this is not so material as feed water is always hot.
Q. What are the principal causes of priming in boilers?
A. To high water, not steam room enough, misconstruction, engine too large for boiler.
Q. How do you keep boilers clean or remove scale therefrom?