the first position by the high pressure refrigerant and lubricating oil passing through the valve 156 in the illustrated embodiment the valve 156 is a reed valve and the movable member 160 is a reed however other types of valves can also be used when the reed 160 is in the first position the bleed line 152 is closed so that the high pressure refrigerant and lubricating oil travel through the valve 156 and to the oil separator 128 lubricating oil flows through the oil supply line 136 to lubricate the rotors 108 and the other components not shown in the compression chamber 112 i e the bearings the gears and the shaft seals when the compressor 104 is shut down fig5 the reed 160 is moved to the second position by the high pressure refrigerant and lubricating oil that is trying to pass back through the valve 156 toward the lower pressure at the suction end 116 as will be described in more detail below a biasing spring can also be used to move the reed 160 to the second position when the compressor 104 is shut down when the reed 160 is in the second position the discharge line 124 is blocked and the bleed line 152 is opened to provide a pathway for the high and low.