Crankcase Pressure Regulators for an internal combustion engine. It has floating-disk type vacuum pressure regulator operatively connected to a breather tube. This is for blow by gases upstream of a flow restriction such as an oil separator. This valve automatically throttles the high pressure suction vapor form the evaporator until the compresser handle the load. It should be installed in the suction line close to the compressor suction valves. It can be used for, the problem of low temperature compressor tripping.