A compressor comprising: a first scroll member including a first end plate defining a first discharge port and a first spiral wrap extending from said first end plate ; a second scroll member including a second end plate defining first and second variable volume ratio ports and a second spiral wrap extending from said second end plate and meshingly engaged with said first spiral wrap and forming compression pockets , said first variable volume ratio port located radially outward relative to said first discharge port and in communication with a first compression pocket , said second variable volume ratio port located radially outward relative to said first discharge port and in communication with a second compression pocket , said second end plate defining a second discharge port in selective communication with said first and second variable volume ratio ports , said first and second spiral wraps defining a central discharge pocket in communication with said first and second discharge ports ; a drive shaft engaged with said second scroll member and driving orbital displacement of said second scroll member relative to said first scroll member ; and a first variable volume ratio valve displaceable between a closed position and an open position, said first variable volume ratio valve isolating said first variable volume ratio port from said central discharge pocket when in the closed position and providing communication between said first compression pocket and said discharge pocket via said first variable volume ratio port when in the open position, characterized in that said first variable volume ratio valve , when in the closed position, isolates said first and second variable volume ratio ports from each other and isolates the first and second variable volume ratio ports from communication with the second discharge port . a first scroll member including a first end plate defining a first discharge port and a first spiral wrap extending from said first end plate ; a second scroll member including a second end plate defining first and second variable volume ratio ports and a second spiral wrap extending from said second end plate and meshingly engaged with said first spiral wrap and forming compression pockets , said first variable volume ratio port located radially outward relative to said first discharge port and in communication with a first compression pocket , said second variable volume ratio port located radially outward relative to said first discharge port and in communication with a second compression pocket , said second end plate defining a second discharge port in selective communication with said first and second variable volume ratio ports , said first and second spiral wraps defining a central discharge pocket in communication with said first and second discharge ports ; a drive shaft engaged with said second scroll member and driving orbital displacement of said second scroll member relative to said first scroll member ; and a first variable volume ratio valve displaceable between a closed position and an open position, said first variable volume ratio valve isolating said first variable volume ratio port from said central discharge pocket when in the closed position and providing communication between said first compression pocket and said discharge pocket via said first variable volume ratio port when in the open position, characterized in that said first variable volume ratio valve , when in the closed position, isolates said first and second variable volume ratio ports from each other and isolates the first and second variable volume ratio ports from communication with the second discharge port . <EOS>