The apparatus may have a means for introducing lubricant and a means for introducing compressed air to drive lubricant through the apparatus.

A compressed air passage and an intake valve, for introducing compressed air into the small combustion chamber during an exhaust cycle, are also defined in the cylinder head.

Before spraying, cleaning is carried out by introducing compressed air through blowing ducts (3) and suctioning the residue through recovery conduits (4).

A paint-spray gun (1) comprising a body (2) having an atomizer nozzle (4) for atomizing a paint to be sprayed, and a support (3) having a connector (8) for introducing compressed air.

The compressed air filtration subsystem filters the compressed air to acquire clean compressed air.

The apparatus may have a means for introducing lubricant and a means for introducing compressed air to drive lubricant through the apparatus.

The compressor inhales an air from the outside to generate a compressed air and discharges the compressed air to the outside.

The compressed air supplying apparatus (33) supplies compressed air into the airtight space.

The compressed air storage tank stores the compressed air.

A compressed air storage (18) stores compressed air.

The air drying chamber rotates compressed air supplied from the compressor to remove moisture from the compressed air using Coanda effect and dry the compressed air, and simultaneously to accelerate and discharge the compressed air.

A compressed air passage and an intake valve, for introducing compressed air into the small combustion chamber during an exhaust cycle, are also defined in the cylinder head.

The compressed air tank is to supply compressed air.

The compressed air supply unit generates compressed air and supplies a target pipe to be cleaned with the generated compressed air.

Compressed air can be temporarily supplied at emergency such as interruption of the compressed air.