Contracor Educt-o-Matic [5/44] Principles of operation

CONTRACOR

EDUCT-O-MATIC Art. 12 800

ENGLISH

3. Principles of Operation

When the dual-seated valve is fully open, compressed air entering the tool is split into two

streams. The rst rushes through the air hose to the blast jet. A partial vacuum is created

in the blast head at the point where this air stream passes from the blast jet to the blast

nozzle, and abrasive is drawn up to this point from the abrasive container via the abrasive

hose. (This is the principle of eduction which give the tool its name.) The air/abrasive

mixture then passes through the nozzle and strikes the surface being blasted.

The second air stream passes along the tube at the top of the unit to the suction jet,

which creates (again by eduction) the vacuum necessary for abrasive recovery. The region

surrounding the adapter boot’s blast cone is under vacuum whenever the tool is blasting.

Abrasive, dust and debris are drawn up the outer part of the adapter boot into the main

body, where abrasive is separated from lighter particles of debris and dust by cyclonic

action. Abrasive falls through a screen into the abrasive container to be reused for blasting.

Debris and dust spiral inward to the center of the main body, and from there move out the

top and into the dust bag.