Abstract: A compressor of a heating, ventilation, and air conditioning (HVAC) system includes a casing having an inner volume and an inner surface defining the inner volume, where the inner volume is configured to accommodate a rotor therein. The compressor also includes an economizer port formed in the casing and configured to inject a flow of fluid into the inner volume and a valve disposed within the economizer port and configured to regulate the flow of fluid into the inner volume. The valve has an inward-facing surface, and the inward-facing surface is aligned with the inner surface of the casing in a closed position of the valve.

Abstract: A rotary control valve is provided. The valve includes a valve body having a first valve member with a first volute formed therein, wherein the first volute further includes a plurality of flow channels of varying diameter or a single flow channel having a generally smooth gradient from large to small diameter; and a second valve member in close proximity to or in direct contact with the first valve member with a second volute formed therein, wherein the second volute further includes a plurality of flow channels of varying diameter or a single flow channel having a generally smooth gradient from large to small diameter. The first and second volutes cooperate with one another to form an orifice between the first and second valve members, and the diameter of the orifice is variable based on the positions of the individual flow channels relative to one another.

Abstract: A rotary control valve is provided. The valve includes a valve body having a first valve member with a first volute formed therein, wherein the first volute further includes a plurality of flow channels of varying diameter or a single flow channel having a generally smooth gradient from large to small diameter; and a second valve member in close proximity to or in direct contact with the first valve member with a second volute formed therein, wherein the second volute further includes a plurality of flow channels of varying diameter or a single flow channel having a generally smooth gradient from large to small diameter. The first and second volutes cooperate with one another to form an orifice between the first and second valve members, and the diameter of the orifice is variable based on the positions of the individual flow channels relative to one another.