Patent ID: 7371059

Claim:
A scroll compressor comprising: an orbiting scroll member having an orbiting end plate defining a discharge port and an orbiting spiral wrap extending from said orbiting end plate; a non-orbiting scroll member having a non-orbiting end plate and a non-orbiting spiral wrap extending from said non-orbiting end plate; said non-orbiting spiral wrap being intermeshed with said orbiting spiral wrap; a bearing housing extending from said non-orbiting end plate in a direction opposite to said non-orbiting spiral wrap; a drive member for causing said orbiting scroll member to orbit relative to said non-orbiting scroll member whereby said spiral wraps create pockets of progressively changing volume between a suction pressure zone and a discharge pressure zone; said drive member extending through said bearing housing, said non-orbiting scroll member and said orbiting scroll member; and a counterweight attached to said drive member at a position adjacent said orbiting end plate, said counterweight rotating adjacent said discharge port to define a discharge valve for controlling fluid flow through said discharge port.