Interstage capacity control valve with side stream flow distribution and flow regulation for multi-stage centrifugal compressors

A heating, ventilation, air conditioning, and refrigeration (HVACR) circuit, comprising:

• a centrifugal compressor;
• a condenser;
• an expander;
• and
• an evaporator,
• wherein the centrifugal compressor includes:
• a first stage impeller;
• a second stage impeller;
• a side stream injection port located between the first stage impeller and the second stage impeller, the side stream injection port configured to receive a side stream of a fluid;
• and
• a capacity control valve, the capacity control valve configured to extend and retract through the side stream injection port,
• the capacity control valve has a curved surface facing a direction of flow from the first stage impeller to the second stage impeller;
• and
• the capacity control valve is configured to be extended through the side stream injection port between an open position where the side stream of the fluid can flow through the side stream injection port and a closed position where the capacity control valve obstructs flow of the side stream of the fluid through the side stream injection port.