Editing Injector (section)

===Lifting properties===
Other key properties of an injector include the fluid inlet pressure requirements i.e. whether it is lifting or non-lifting.

In a non-lifting injector, positive inlet fluid pressure is needed e.g. the cold water input is fed by gravity.

The steam-cone minimal orifice diameter is kept larger than the combining cone minimal diameter.<ref>{{cite book|last1=Pullen|first1=William Wade Fitzherbert|title=Injectors: their Theory, Construction and Working|date=1900|publisher=The Technical Publishing Company Limited|location=London|page=51|edition=Second |isbn=0951936751}}</ref> The non-lifting Nathan 4000 injector used on the [[Southern Pacific 4294]] could push 12,000 US gallons (45,000&nbsp;L) per hour at 250 psi (17&nbsp;bar).<ref>{{cite book|last1=Anderson|first1=David N.|last2=O'Day|first2=Russell M. H.|title=Cab-Forward Notes Southern Pacific Railroad's Signature Locomotive|date=17 July 2013|publisher=Gerald Rood|location=Sacramento, California|page=66|edition=Revision 1}}</ref>

The lifting injector can operate with negative inlet fluid pressure i.e. fluid lying below the level of the injector. It differs from the non-lifting type mainly in the relative dimensions of the nozzles.<ref>The Model Injector, Ted Crawford, Tee Publishing</ref>