A compressor assembly including a separator having a separator space. The separator is operable to remove a liquid from a mixture of the liquid and a gas. The assembly includes a sump having a sump space that is positioned to receive the liquid from the separator. A valve is positioned between the separator space and the sump space and is moveable to a closed position in response to a predetermined flow between the sump space and the separator space. A biasing member is positioned to bias the valve toward an open position