What is the application of a Crankcase Pressure Regulator (CPR)?
To protect some designs of compressor from high suction pressures causing the compressor motor to overload, an outlet pressure regulator can be installed in the suction line before the compressor. The set point of the valve is adjusted to the maximum pressure that the compressor can safely operate at. When the suction pressure rises above the set point the valve will tend to close but when the pressure falls below the set point the valve will open.
