Valve arrangement for capacity control of screw compressors
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United States of America Patent
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-
Feb 12, 1985
Issued Date -
N/A
app pub date -
Sep 14, 1983
filing date -
Jun 2, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a valve arrangement for capacity control of an oil-injected screw compressor. One or more piston valves are arranged one after the other in the axial direction of the rotors at the portion of the rotor barrels where the internal compression phase occurs. The compressor control valves are actuated by the discharge pressure, which in their turn open or close the piston valves. When the piston valves are open, a portion of the gas in the compression space is discharged to a bleed off passageway and it flows back to the inlet port of the compressor so that substantially no compression work is spent on this portion of the gas.
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