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Screw compressor

Screw compressor

Screw compressor

(OP)
Hi Guys,
          Can  someone  help me  in  explaining  how  the  slide  stop in the screw  compressor work(for  capacity control).i have  some  idea  abt slide valve.
thanx

RE: Screw compressor

The action of a slide valve is to release the gas drawn into the compressor and trapped between the rotor and casing and return it to the inlet before the compression starts.  

RE: Screw compressor

Typically the unloader (either slide valve or turn valve) can only unload a portion of inlet stream.  This portion ranges by manufacturer from 40% to almost 90%.  One seldom-referenced consequence of using an unloader is that it changes the VI upward (since the screw sees a larger inlet plenum).  A higher VI will tend to require somewhat more hp for a given compressor load.

David Simpson, PE
MuleShoe Engineering
www.muleshoe-eng.com

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