Adjustment; Adjusting Cleaning Pressure; Changing Abrasive Quantity Fed To Nozzle - Contractor BRS-3 Bedienungsanleitung

5. Adjustment.

5.1 Adjusting cleaning pressure.

The operator is able to regulate blasting pressure to correspond to the application by using
the pilot pressure regulator, which is located on the cabinet's control panel. For most
applications approximately 5-6 bar is appropriate. Delicate substrates may require lower
pressure, which can diminish media breakdown. Difficult blasting jobs on sturdy substrates
necessitate higher pressure but will increase media breakdown. Maximum production can
only be reached by carefully monitoring the blasting pressure. Turn the knob on the pilot
regulator on the front of the control panel to regulate air pressure. Pull the knob out and
turn it clockwise to increase pressure or counter-clockwise to decrease it. After the operating
pressure has been set, push the knob back in to lock it.

5.2 Changing abrasive quantity fed to nozzle.

Media volume flow is adjusted by the metering
valve at the foot of the blast machine. The
abrasive metering valve consists of the valve
body, abrasive in and outlets, as well as the
handle which is connected to the dosing
disc. The dosing disc has an opening which
is of equal diameter to the abrasive inlet. The
abrasive flow is regulated by the overlap of
the dosing opening to the abrasive inlet. The
abrasive flow is greatest when the dosing
opening completely overlaps the abrasive
inlet. This is the case when the handle is in the
middle position. By turning the handle to the
Metering valve
left or right, the overlap and the flow is reduced.
The overlap is nil when the handle is in the full
Fig. 5.2.
right or full left position, and the abrasive flow
is nil.
Adjust flow rate according to type and size of blast media, blasting pressure, and the task at
hand, ensuring to use as little media as possible whilst still maintaining a high cleaning pace. The
correct mixture of air and abrasive can generally be distinguished by a slight discoloration at the
exit of the nozzle.
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CONTRACOR Version 1.2
®