Abstract: An aerator valve assembly adapted to provide selective fluid communication between a supply of pressurized gas and a pressure vessel and adapted to provide selective fluid communication between the pressure vessel and a bulk material handling structure. The valve assembly includes a valve housing including a valve body, an end cap adapted to be connected to the supply of pressurized gas, and a piston seat having an outlet port adapted to provide fluid communication with the bulk material handling structure. The valve body includes a port adapted to provide fluid communication with the pressure vessel. A piston is located within a chamber of the valve body between the end cap and the piston seat. The piston is selectively slidable between an extended position wherein the piston creates a metal-to-metal seal with the piston seat to seal the outlet port closed and a retracted position wherein the seal is broken.