US Patent 7267529 Deaeration system

A deaerator includes a stationary separation chamber with first and second opposite walls or ends and a peripheral wall in between. Rotating vanes are mounted on a shaft. A large inlet leads to the stationary chamber at the first end and is arranged along a center axis of the chamber. An air reject port lies inside the inlet and is arranged along a center axis of the chamber. The vanes are spaced from the peripheral wall to define a gap. An exit chamber is included at the second end between the vanes and second wall. A vacuum is connected through the air reject port. A variable orifice valve is located at the inlet and outlet. Pressure sensors are also provided at the inlet and outlet. The valves are controlled to regulate the fluid flow, internal level, and pressure in the chamber.