A steam or water ejector is a type of jet pump that uses high-velocity steam or water to create vacuum or move fluids. It operates on the Venturi principle, where a motive fluid (steam or water) passes through a nozzle, creating a low-pressure zone that entrains another fluid (gas, vapor, or liquid), mixing with it and discharging the combined stream at higher pressure.
A steam reheater injector is a type of jet injector used primarily in steam power plants or boiler systems to reheat steam by using high-pressure steam as the motive fluid. It operates similarly to a steam ejector but with the specific goal of raising the temperature of the lower-pressure steam (or feedwater) by mixing it with higher-energy steam.