Machines that compress air or gas from initial pressure to an intermediate pressure in one or more
cylinders or casings
Unload
The air compressor continues to run, usually at full RPM, but no air delivered because inlet either
closed off or modified, not allowing inlet air to be trapped
Unloaded horsepower
The power consumed to overcome the frictional losses when operating in an unloaded condition
Venturi
A tube with a narrow throat (a constriction) increasing velocity and lowering pressure of liquid
passing through it that creates a partial vacuum immediately after the constriction in the tube. The
vacuum created has a sucking effect, and a venturi is commonly used to introduce a liquid (such as
a refrigerant) or gas (such as air) into a flowing water stream
Volumetric efficiency
The ratio and percent of the actual delivered capacity (measured at inlet temperature, pressure and
gas composition) to the piston displacement
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