1. If boiler pressure does not exceed 75 lbs. per square inch, exhaust steam only is required. In this case steam is admitted by valve A.
Fig. 539.
2. For pressures exceeding 75 lbs. exhaust steam is admitted as before, also a little live steam, slowly, by valve C.
3. If engine is not running, live steam is gradually admitted by valve B, so that it may expand in pipe F. In case of high boiler pressure additional live steam is introduced by valve C.
To start this injector.
1. Open steam valves as described.
2. Then open water valve.
3. Regulate water valve, and, if necessary, screw up or down nut R at the lower end of injector until overflow ceases.