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TYPE 30 2475 - Bare Air Compressor Block

This is a bare solid cast iron compressor block (Pump). It is a very old, but reliable design for heavy industrial applications.

Airpower's selection of Type 30 Air Compressor Blocks are all made with quality material for wear and tear parts and aluminum parts.


Flywheel: 349mm X 1SPA

Motor needed: 4kW – 5.5 kW (5 hp. – 7.5hp)

Displacement at 965 rpm 4 kW motor 546 liter/min.

Free air delivery at 965 rpm 443 liter/min

Number of pistons: 2

Stages: 2

Low-pressure piston diameter: 102 mm and stroke 70mm

High-pressure piston diameter: 64 mm and stroke 70mm

Maximum pressure: 12 bar

What is an Air Compressor Block?

Also called a reciprocating compressor block or bare piston compressor block, a compressor block is the part doing the compression of the air. A piston moving in a reciprocating motion within the cylinder compresses the gas. It is driven by an electric motor or another form of rotation. The pistons are moving up and down and compress the air from atmospheric pressure up to full tank pressure. As the volume decreases the pressure increases. The gas is then pushed out of the cylinder to the next stage of compression or to the discharge connection.

Exploded View

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