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.

<38 thb: steam injector. tliey should generally decrease in size as the bore of the nozzle decreases. '1’ 1 ie points to be borne in mind in connection with the overflow arrangements are: — (2) The overflow apertures should be of sufficient total area, and also such as to prevent any throttling of the steam in its passage to the atmosphere when the injector is starting. (3) The overflow apertures should be independent of one another, so that no circulation can take place between one aperture and its neighbours. Fi G. 49. . (3) Means should be provided to prevent an inflow of air to th& overflow chamber or to the combining nozzle interiör, but such means should not prevent an outflow from said chamber or nozzle should the jet break. (4) If the pressure in the combining nozzle is greater than atmospheric, free communication between the interiör of the combining nozzle and the atmosphere should be pre- vented by means which will, however, allow of such com- munication when the injector knocks off or is not delivering into the vessel being fed.