Scroll compressor with center hub

A compressor comprising:

• a shell assembly;
• a non-orbiting scroll disposed within the shell assembly and including a first end plate and a first spiral wrap, the first end plate including a primary discharge passage and a secondary discharge passage located radially outward relative to the primary discharge passage;
• an orbiting scroll disposed within the shell assembly and including a second end plate having a second spiral wrap extending therefrom and meshingly engaged with the first spiral wrap;
• a hub plate fixedly mounted to the non-orbiting scroll and including a main body and a central hub extending axially from the main body, wherein the central hub includes a recess, a hub aperture, and a central aperture in communication with the recess, and wherein the hub aperture is disposed radially outward relative to the recess and the central aperture and is in selective fluid communication with the primary and secondary discharge passages;
• a primary valve member reciprocatingly received within the recess of the hub plate, wherein when the primary valve member is in a closed position, the primary valve member restricts fluid flow between a discharge chamber and the primary discharge passage, and wherein fluid flow through the central aperture forces the primary valve member toward the closed position;
• and
• a secondary discharge valve assembly including a secondary valve member disposed between the hub plate and the first end plate, wherein the secondary valve member is movable relative to the hub plate and the first end plate, wherein when the secondary valve member is in an open position, fluid is allowed to flow from the secondary discharge passage through the hub aperture, and wherein when the secondary valve member is in a closed position, the secondary valve member restricts fluid communication between the secondary discharge passage and the hub aperture.