Reciprocating Air 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. When the piston reverses direction and moves towards the closed end of the cylinder it compresses the air and forces it out of the cylinder through the discharge valve. A crankshaft and connecting rod create the reciprocating motion of the piston, and piston rings seal the clearance between the piston and the cylinder. The compressor described above is a single stage unit, meaning that ambient air is compressed to the desired discharge pressure in one step. Since compressing air releases more and more heat as pressure increases, single stage compression becomes impractical for discharge pressures over 100 psi. Efficiency, longevity and pressure capability can be improved through multistage compression, where two or more cylinders are involved. In a 2 stage design, the first stage (low pressure) cylinder compresses ambient air part of the way and sends it through a heat exchanger called an intercooler to the second stage (high pressure) cylinder, where it is compressed to the final discharge pressure. In a 3 stage compressor another intercooler and cylinder are added.


Two Stage Splash Lubricated Air Cooled Reciprocating Compressors

    Cal Supply's Valve Two Stage Splash Lubricated Air Cooled

Cal Supply's Two stage splash lubricated air cooled reciprocating air compressors offer higher pressure capability and lower initial cost. They are used widely throughout the automotive industry.

  • 1/2 to 30 HP Units available

Reed Valve Two Stage Splash Lubricated Air Cooled

These basic machines offer fewer options that our other splash lubricated reciprocating compressors. However they are designed with a much lower initial cost in mind.

Two Stage Pressure Lubricated Air Cooled Reciprocating Compressors

Pressure Lubricated units can operate in conditions where day-to-day service is not available i.e., remote locations, off level operations such as off the road equipment. These compressors fill the need for pressures greater than 175 psi (up to 250 psi). Great for harsh industrial applications.

  • 1 1/2 to 30 HP Units available

Oil Free Two Stage Reciprocating Compressors

Oil Free, or Oil Less, reciprocating compressors are best for small to medium-sized applications that require oil-free compressed air.

  • Continuous Duty Rated
  • High Quality Materials
  • Packages to meet any specification
  • 1 to 15 HP Units available