2.1 Construction

The compressor described in this instruction book is constructed as a two cylinder, two stage single action water cooled compressor. The principles of its construction are illustrated in Figures 2.1 and 2.2.

Fig. 2.1 Construction principles

The compressor’s first stage is often referred to as the low pressure (LP) stage, and the second stage is called the high pressure (HP) stage. The circulation of air through the compressor is shown in Figure 2.2.

Fig. 2.2 Air circulation

Explanation of symbols:

A Intake filter

B LP suction valve

C LP delivery valve

D LP safety valve

E LP cooler (intercooler)

F HP suction valve

G HP delivery valve

H HP cooler (aftercooler)

I HP safety valve

All bearings in the compressor are pressure lubricated by means of a gear pump connected directly to the end of the crankshaft.

Two replaceable pipe coolers are mounted in the compressor’s cylinder block, one of which cools the compressed air after first-stage compression, while the other cools it after second-stage compression.

The intake and discharge of the cooling water is arranged so that it circulates through the cylinder block and ensures effective cooling of the air and the compressor’s cylinder walls.

The compressor increases the pressure of air from atmospheric pressure to a specified pressure, up to a maximum of 35 bar.

The compressor is normally fitted with an electric motor or other source of motive power on a well-braced baseplate, with a flexible coupling between the compressor and the motor.

All compressors are test run before delivery from the factory, and all installations with motors will have been correctly aligned.

This compressor, which is used to produce pressurised air for compressed air tools and instruments as well as starting air, satisfies the requirements of the certification companies.