An ejector operates on similar principles to create a vacuum feed connection for braking systems etc. Other types of injector may use other pressurised motive fluids such as air.ĭepending on the application, an injector can also take the form of an eductor-jet pump, a water eductor or an aspirator. When first developed, its operation was intriguing because it seemed paradoxical, almost like perpetual motion, but it was later explained using thermodynamics. It is a typical application of the injector principle used to deliver cold water to a boiler against its own pressure, using its own live or exhaust steam, replacing any mechanical pump.
It is a fluid-dynamic pump with no moving parts except a valve to control inlet flow.Ī common device used for delivering water to steam boilers, especially in steam locomotives is a steam injector. Injector used in steam locomotives A- Steam from boiler, B- Needle valve, C- Needle valve handle, D- Steam and water combine, E- Water feed, F- Combining cone, G- Delivery nozzle and cone, H- delivery chamber and pipe, K- Check valve, L- OverflowĪn injector is a system of ducting and nozzles used to direct the flow of a high-pressure fluid in such a way that a lower pressure fluid is entrained in the jet and carried through a duct to a region of higher pressure. For the system that adds fuel to an internal combustion engine, see fuel injection.
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