If injector fails, examine at all of these points before condemning. The most common trouble is a leaky suction.
In describing the method of connection and operating an injector the foregoing may have to be modified in some instances, as there are a great many different kinds and styles of injectors which operate and connect differently, but the above if followed carefully and with a little discretion will be found useful.
Bear in mind, however, that the injector does not start to work to boiler as soon as it gets the water. At first the water will run out of the overflow. At this point you start the injector working to the boiler by closing and opening the water valve as quickly as possible with a jerk, or as nearly with one motion as you can.
Q. How do you find the maximum and minimum capacity of injectors?
A. Injectors are controlled entirely by the suction valve after steam is turned on. To find the maximum capacity of an injector after starting, gradually open the suction valve in supply pipe until steam “breaks” and water comes out of the overflow, then start the injector again and you will know about how far the suction valve can be opened without causing the “break.”
To find the minimum capacity of the injector, manipulate the suction valve in the same manner in exactly the opposite direction.
DIRECTIONS FOR OPERATING
WORLD INJECTOR.
See that the injector is shut off when put on, by turning the handle as far to the right as it will go. To start, turn handle to the left one-quarter turn; when the water appears at the overflow, turn the handle slowly to the left as far as it will go, and the injector will be working to the boiler.
American World Injector.