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A sectional diagram of a typical steam boiler feed injector, simplified to show the major parts common to such injectors, showing typical proportions, and using colour and shading to hint at temperature, pressure, and velocity variations in the fluid flows. The SVG was hand coded using a text editor.
injector valves, which allow steam to force water into the boiler when needed [3]: 42 water gauges , which allow the level of water in the boiler to be monitored [ 3 ] : 91 mechanical stoker controls (when fitted to larger coal-fired locomotives) or oil feed controls for oil-fired locomotives
The steam injector is a common device used for delivering water to steam boilers, especially in steam locomotives. 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.
The furnace end of a Polish mechanical stoker entering a steam locomotive firebox. A mechanical stoker is a mechanical system that feeds solid fuel like coal, coke or anthracite into the furnace of a steam boiler. They are common on steam locomotives after 1900 and are also used on ships and power
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A means had to be provided, of course, to put the initial charge of water into the boiler (before steam power was available to operate the steam-powered feedwater pump). The pump was often a positive displacement pump that had steam valves and cylinders at one end and feedwater cylinders at the other end; no crankshaft was required.
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Steam locomotive with Giesl flat ejector in Austria Austrian 0-12-0T and 0-6-2T fitted with Giesl ejectors, Eisenerz depot, August 1971 Smokebox with Giesl-ejector on the ČSD 534.0432 in museum Lužná u Rakovníka. A Giesl ejector is a suction draught system for steam locomotives that works on the same principle as a feedwater injector.