Blast medium pot

A blast cabinet having a blast medium pot, the blast cabinet having a housing defining an enclosure and being configured for blasting with blast particulate a workpiece disposed within the enclosure, the blast medium pot being disposed below the enclosure and configured to collect spent blast particulate, the blast medium pot comprising:

• a housing portion;
• a hollow pressure vessel mounted to the housing portion therebelow and defining an interior chamber with a blast inlet and a compressed air inlet, the blast inlet being disposed at an upper end of the interior chamber and defining a vertical axis, the compressed air inlet fluidly connecting the interior chamber to a compressed air source for pressurizing the pressure vessel;
• and
• a plunger assembly disposed intermediate the housing portion and the pressure vessel, the plunger assembly having a valve body located within the pressure vessel and being sized and configured such that direct engagement thereof against the blast inlet creates a fluid-tight seal;
• wherein the plunger assembly is configured such that the valve body is selectively movable along the vertical axis between open and closed positions such that compressed air may be maintained within the pressure vessel when the valve body is in the closed position and blast particulate may pass through the blast inlet when the valve body is in the open position.