Steam jet air ejector operation

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A steam injector is typically used to deliver cold water to a boiler against its own pressure using its own live or exhaust steam , replacing any mechanical pump.

Steam Jet Ejectors . Steam jet Ejectors are based on the ejector -venturi principal and operate by passing motive steam through an expanding nozzle.

A steam injector is typically used to deliver cold water to a boiler against its own pressure using its own live or exhaust steam, replacing any mechanical pump . This was the purpose for which it was originally invented in 1858 by Henri Giffard . Its operation was from the start intriguing since it seemed paradoxical, almost like perpetual motion, but its operation was later explained using thermodynamics . [1] Other types of injector may use other pressurised motive fluids such as air.

Depending on the application, an injector can also take the form of an eductor-jet pump , a water eductor or an aspirator . An ejector operates on similar principles to create a vacuum feed connection for braking systems etc..

The injector was invented by Henri Giffard for the steam locomotive [2] and patented in the United Kingdom by Messrs Sharp Stewart & Co. of Glasgow .

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