Variable volume ratio compressor

A compressor comprising:

• a shell assembly defining a discharge chamber;
• a non-orbiting scroll disposed within the discharge chamber and including a first end plate and a first spiral wrap extending from the first end plate;
• an orbiting scroll disposed within the discharge chamber and including a second end plate and a second spiral wrap extending from the second end plate, the first and second spiral wraps meshing with each other to define a plurality of fluid pockets therebetween, the fluid pockets movable among a radially outermost position, a radially intermediate position, and a radially innermost position, the second end plate including a variable-volume-ratio port extending therethrough and selectively communicating with one of the fluid pockets at the radially intermediate position;
• and
• a variable-volume-ratio valve assembly mounted to the orbiting scroll and including a valve member that is movable relative to the orbiting scroll between an open position allowing communication between the variable-volume-ratio port and the discharge chamber and a closed position restricting communication between the variable-volume-ratio port and the discharge chamber,
• wherein the first end plate of the non-orbiting scroll includes a discharge passage in communication with the discharge chamber and one of the fluid pockets at the radially innermost position, wherein the variable-volume-ratio port is disposed radially outward relative to the discharge passage, and
• wherein when the valve member is in the open position, fluid flows from the variable-volume-ratio port to the discharge chamber without flowing through the discharge passage in the non-orbiting scroll and without flowing back into any of the fluid pockets.