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5.1 Popup Valve (abrasive inlet)
The blaster is filled with abrasive through the abrasive inlet at the top of the pressure vessel.
The abrasive inlet is automatically sealed by the popup head (#5) when the blaster is
pressurized. The air flow into the internal piping pushes the popup up (#5) against the gasket
(#6). See Figure 5.2. Note: MV3/Combo blasters manufactured after September 2016 are
equipped with the new High Flow Popup and a SureSeal (skirted) gasket.
Pinch point hazard. Vessel pressurization will close the popup. Keep hands and fingers away
from popup. Disconnect air supply prior to performing popup maintenance.
Figure 5.2 – Standard Popup Assembly & Internal Piping
5.2 Air Supply Connection
Air is supplied to the abrasive blaster through a hose connection at the air inlet crowfoot (#2).
The air supply hose connected to the abrasive blaster must be same diameter as the air supply
piping and rated at a minimum of 150psi operating pressure. See the drawings and parts lists in
Section 9.0 and refer to Sections 3.4 and 5.12.
5.3 Air Inlet Ball Valve
The air inlet ball valve (#3) is used to turn on and turn off the air flow to the abrasive blaster.
When the inlet ball valve is opened, air will flow through the moisture separator (#7) and into
the ComboValve® (#4). In a properly operating MV3 Valve / ComboValve system the blast
vessel does not pressurize when the inlet ball valve is opened.
5.4 Moisture Separator (optional)
The air inlet moisture separator is an option available on the abrasive blaster. Air flow into the
blaster passes through the moisture separator (#7) which removes moisture, oil, and dirt
particles from the inlet air. The water that is removed by the separator is drained by opening the
ball valve (#8) at the bottom of the separator. This ball valve should be left slightly opened
anytime the blaster is in operation. This allows water to be drained as it is filtered from the blast
air. Note: Not all abrasive blasters are equipped with a moisture separator.
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