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.

70 THE STEAM LNJECTOR. sents itself in that the water tends, on a reduction of the pressure on its surface, to flash into steam and supply vapour only to the injector. For this reason the maximum temperature for automatic restarting, when the injector is lif ting, is considerably below the maximum temperature to which the feecl water can be raised after the injector has started to work. Thus, for example, the maximum re- starting temperature of the feed water in one test was 104 deg. Fah., whilst thé maximum temperature to which the water could be raised aftør the injector had started was Fig. 56. 125 deg. Fah. The capabilities of any injector as regards the maximum allowable temperature of feed water with any steam pressure cannot be predicted, as they depend 'ery largely upon the design of injector and also upon other indeterminable conditions. A simple arrangement for dealing with the difficulty before referred to, due to the presence of hot water in the