The Steam Injector
A theoretical and practical treatise on the design and operation of injectors and on the flow of fluids through and the design of nozzles.

WATER CONTKOL ARRANGEMENTS. 75 ture within the combining nozzle below what would exist if all the feed water ente-red at the main water inlet. A reduction of the temperature and pi’essure at the gap between the combining and delivery nozzles is of the greatest importance with an injector working with. high prerssure steam and hot feed water, for a very high pres- sure at that point causes the jet to be unstable and very li able to break. The diagram, fig. 54*, shows the maximum allowable temperatures of the feed water with any steam pressure for a typical injector having a supplementary water inlet. The irregular shape of the curve between 75 Ibs. to 125 Ibs. steam pressure is due to the injector comm&ncing to draw in a supplementary water supply between the said pres- sures. It will be understood that when the feed water is hot, and has to be lifteel to the injector, a difficulty pre- By Kneass, in Journal of Franklin Institute.