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A diffuser vane assembly for a centrifugal compressor includes movable vanes which are inserted or retracted from the diffuser passage through slots in one of the diffuser walls. The vane assembly is axially movable by an internally threaded drum and gear arrangement. A hand crank external to the co

A diffuser vane assembly for a centrifugal compressor includes movable vanes which are inserted or retracted from the diffuser passage through slots in one of the diffuser walls. The vane assembly is axially movable by an internally threaded drum and gear arrangement. A hand crank external to the compressor is effective to rotate the drum and thereby axially move the plate and attached vanes within the diffuser passage.

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A centrifugal compressor equipped with diffuser vanes, comprising: an impeller for compressing a fluid; a diffuser passage defined by opposing sidewalls, one said sidewall having a plurality of slots therein; a circular plate having a plurality of diffuser vanes attached thereto, said diffuser vanes

A centrifugal compressor equipped with diffuser vanes, comprising: an impeller for compressing a fluid; a diffuser passage defined by opposing sidewalls, one said sidewall having a plurality of slots therein; a circular plate having a plurality of diffuser vanes attached thereto, said diffuser vanes extending through respective slots of said diffuser sidewall, said plate having threads on an annular edge thereof; a drum having annular threads engagable with the threads of said plate, said drum having gear teeth, and being rotatable within a housing of said compressor; a gear mateable with the teeth of said drum; and means for driving said gear so that rotation thereof is effective to rotate said drum and laterally move said plate, whereby said vanes are laterally moved in said diffuser passage.