http://www.mekanizmalar.com/how-steam-injectors-work.html In the link above, the basics of steam injector is given. Steam Injector's don't have any moving parts and doesn't consume any energy by themselves. Still, it can be able to pressurise water and inject that to a high pressure Boiler by using the steam from that same Boiler. By going through the description, anybody with some knowledge of physics can understand that the Latent Heat of Vaporisation of the steam will be used to increase pressure of the injected water. Now, I just want to know if the working and suction fluids are reversed i.e. if water is used as the suction fluid and steam as the fluid to be sucked and pressurised, can injectors be useful for that purpose? As per some information gathered from steam injector manufacturers, it will take around 1 kg steam to suck 11 kg of water. Simple rule of thumb says that it will take around 11 kg of water flow at the same speed to suck 1 kg of steam. But, question is whether any kind of formula is available for that purpose and can we calculate how much water with level of speed is necessary to raise a definite amount of steam from Pressure A to Pressure B. Want to hear from others here.