Q. Will an injector work with hot supply water?
A. An injector will not work if the water that is delivered from the tank is too hot to condense the steam.
Q. What are the principal causes of an injector not working accurately?
A. Leak in suction pipe, supply cut off by strainer being clogged, loose lining inside the hose, leak in the stem of valve, too little steam pressure to lift, dirt in the tubes, red lead blown or drawn in through steam or supply pipe, bad check valve, not lift enough or none at all, new boiler full of grease, wet steam, obstruction in the connection to the boiler.
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.
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.
