Profile: S. V. Engineers offers industrial blowers. We offer twin lobe roots blowers, roots air compressors, twin lobe air blower, pollution control equipment, water treatment equipment, vacuum boosters, and roots air blowers. Our roots air compressor allows positive displacement, and operates against varying pressure. This compressor has two 8" shaped impellers that are mounted on parallel shafts. These shafts rotate in opposite directions while compressing as well as discharging the air trapped in the volute at steady pressure & temperature.