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The purpose of this post is to address the horsepower effects of adding a backpressure valve to a screw compressor that is over compressing. Perhaps the most important thing to be aware of before diving into this subject is the concept of a volume ratio (Vi) within a screw compressor. The simplest way to explain volume ratio is by relating it to the overall compression ratio that a screw compressor achieves. A larger Vi can achieve a greater overall compression ratio while a smaller Vi will achieve a smaller compression ratio.
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