Interstage capacity control valve with separate drive and stabilization linkages

A compressor, comprising:

• a first impeller;
• a second impeller;
• a plurality of guide vanes forming channels located between the first impeller and the second impeller, the channels configured to direct an interstage flow of a fluid from the first impeller to the second impeller;
• a side stream injection port located between the first impeller and the second impeller, the side stream injection port configured to receive a side stream of the fluid;
• and
• a throttle ring configured to move in an axial direction through the side stream injection port between an extended position and a retracted position, wherein in the extended position, the throttle ring obstructs flow of the side stream of the fluid through the side stream injection port and partially obstructs the interstage flow of the fluid through the channels, and in the retracted position, the throttle ring allows the side stream of the fluid to flow through the side stream injection port;
• and
• a drive ring,
• wherein the throttle ring and the drive ring are connected by a plurality of drive linkages, each drive linkage including a first attachment projection on the drive ring, a second attachment projection on the throttle ring, and a linkage arm joined to each of the first attachment projection and the second attachment projection, and
• the throttle ring includes:
• a plurality of stabilization linkage attachment projections, separate from the second attachment projections of the plurality of drive linkages;
• and
• a plurality of stabilization linkage arms, each of the plurality of stabilization linkage arms attached to one of the stabilization linkage attachment projections.

A method of assembling a compressor, including:

• providing a drive ring;
• providing a throttle ring;
• attaching a plurality of first attachment projections to the drive ring;
• attaching a plurality of second attachment projections to the throttle ring;
• attaching each of a plurality of linkage arms to a corresponding one of the plurality of first attachment projections and to a corresponding one of the plurality of second attachment projections;
• attaching a plurality of stabilization linkage attachment projections to the throttle ring, the plurality of stabilization linkage attachment projections being separate from the second attachment projections of the plurality of drive linkages;
• and
• attaching each of a plurality of stabilization linkage arms to a corresponding one of the stabilization linkage attachment projections.