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6.2 Abrasive Blaster Depressurizing Procedure
A MV3 Valve blaster is a depressurized system; meaning that the blaster will depressurize
when the deadman (#12) is released.
6.2.1. Release the deadman (#12) to deactivate the ComboValve® (#4) and depressurize the
abrasive blaster. The blast operation will stop.
Airborne particles and loud noise hazards from blowdown exhaust air can cause serious
injury and loss of hearing. Wear approved eye and ear protection. Stay clear of
blowdown air path. DO NOT place hands or other body parts in the blowdown air path.
Make sure no personnel are in the blowdown air path.
6.2.2. The popup head (#5) will fall open when the blast vessel is completely depressurized.
When the popup valve opens after depressurizing, abrasive can be blown out of the blast
vessel and into the face and eyes of the operator. Wear OSHA approved safety glasses.
See Section 3.10.
6.2.3. Close the air inlet ball valve (#3) to disable the blaster and the deadman blast control.
The ball valve is closed when the handle is fully turned to the position shown in Figure
6.2 (handle perpendicular to body). The handle tab will bottom against the ball valve
body in the closed position. Note: A faulty ball valve may allow air flow even in the
closed position. Confirm air flow is stopped by opening the drain ball valve (#8) or by
loosening the twinline connection (#18) to check for air flow. Replace faulty ball valves.
6.2.4. The blowdown hose (#9) and fittings should be periodically inspected for wear. Refer to
Section 8.0 for inspection and maintenance details.
Figure 6.2 – MV3 Valve Abrasive Blaster with pneumatic blast controls
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