Positive Displacement Compressors

Positive displacement compressors perform work on the gas in a repetitive noncontinuous process. The types within this category include:
• Reciprocating
• Rotary
– Screw
– Sliding Vane
– Liquid Ring
– Roots (Straight Lobe) Blower

A reciprocating positive displacement machine is shown in Figure 100-3. Two rotary positive displacement machines are shown in Figures 100-4 and 100-5.

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