A rotary screw compressor
uses two intermeshed helical rotors (screws) within a precisely machined
stator to compress air. Clearances between the rotors and the stator are
very small and are usually sealed by injected lubricant. More
about Rotary Screw Compressors
A simple reciprocating
compressor uses a piston moving back and forth in a cylinder with one
closed end containing one intake valve and one discharge valve. The intake
valve allows ambient air to flow into the cylinder, and the discharge
valve allows air to flow out of the cylinder. As the piston moves away
from the closed end of the cylinder it creates a vacuum which draws ambient
air through the intake valve. More about
Reciprocating Air Compressors
Air compressors of
both the reciprocating and rotary screw type are available with gasoline,
diesel or natural gas engines as a source of power. They range in size
from a 5 hp portable unit that a carpenter would use on a building construction
jobsite to a 500 hp unit that might be... More
about Engine Driven Air Compressors
Most 2 stage reciprocating
compressors are designed to operate up to a maximum of 175 psi. Most rotary
screw compressors are designed to operate efficiently between 90 and 125
psi. Some applications require high volumes of compressed air in the range
of 45 to 60 psi. More about High &
Low Pressure Air Compressors
Some applications
require a special purpose-built air compressor for reasons of performance,
features or economy. Some examples are compressors for climate control
systems in large buildings, compressors for dry sprinkler systems... More
about Cal's Special Purpose Air Compressors