![]() This type of compressor delivers a fixed volume of air at high pressures. Vane compressors: use a slotted rotor with varied blade placement to guide air into a chamber and compress the volume.Rotary screw compressors can be single-stage or two-stage. Rotary screw compressors provide positive-displacement compression by matching two helical screws that, when turned, guide air into a chamber, whose volume is decreased as the screws turn.Two-stage compressors normally fall into the 5 through 30 horsepower range. Single stage compressors usually fall into the fractional through 5 horsepower range. Using CFM alone to rate a compressor is ambiguous because it represents a flow rate without a pressure reference. ![]() Still others are rated in Cubic Feet per Minute (CFM). To a lesser extent, some compressors are rated in Actual Cubic Feet per Minute (ACFM). The capacities for both single-stage and two-stage compressors are generally specified in Standard Cubic feet per Minute (SCFM) or litres per minute and Pounds per Square Inch (PSI) or bar. Multi-stage compressors provide greater efficiency than their single-stage counterparts for high compression ratios, and generally use interstage cooling to improve efficiency. Piston compressors can be single or multi-stage, and may also have one or more sets of cylinders in parallel (at the same pressure). They use one-way valves to admit air into the cylinder on the induction stroke and prevent it from leaving by the same route, and out of the cylinder through the exhaust valve to the high pressure side on the compression stroke, again using a non-return valve to prevent it leaking back on the next induction stroke.
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