Variable volume ratio compressor

A compressor comprising:

• a shell defining a discharge-pressure region and a suction-pressure region;
• a first scroll member disposed within the shell and including a first end plate and a first spiral wrap extending from a first side of the first end plate, the first end plate including a discharge passage, a first bypass passage and a second bypass passage extending through the first side and a second side of the first end plate;
• a second scroll member including a second spiral wrap cooperating with the first spiral wrap to define first and second fluid pockets therebetween, the first and second fluid pockets in communication with the first and second bypass passages, respectively;
• a partition plate disposed within the shell and separating the discharge-pressure region from the suction-pressure region, the partition plate including a first opening in communication with the discharge-pressure region;
• a bypass valve retainer attached to the partition plate and including a second opening in communication with the first opening, the discharge passage and the discharge-pressure region;
• a bypass valve member disposed between the first end plate and the bypass valve retainer and movable between a first position in which the bypass valve member contacts the first end plate and restricts fluid flow through the first and second bypass passages and a second position in which the bypass valve member allows fluid flow through the first and second bypass passages and through the second opening;
• and
• a discharge valve member movable relative to the bypass valve retainer between a first position in which the discharge valve member contacts the bypass valve retainer and restricts communication between the second opening and the discharge-pressure region and a second position in which the discharge valve member is spaced apart from the bypass valve retainer and allows communication between the second opening and the discharge-pressure region.