Abstract: A multi-stage pressure/vacuum apparatus is disclosed for a bi-directional pneumatic delivery system or the like. The apparatus includes separated turbines or separated sets of turbines that are operated independently of each other to alternatively create pressure and vacuum conditions for an external system such as a pneumatic delivery network relying upon the inventive apparatus for pressure and/or vacuum generation. A common housing contains both turbine sets and defines a system of internal chambers and valve mechanisms between them. The valve mechanisms respond to internal pressures created within the housing by the turbines, and preferably also to gravity in order to control air flow patterns through the housing and between the housing and an external system. According to the present invention, the turbines of the two turbine sets can be operated concurrently at maximum capacity or separately if air power requirements are lesser.

Abstract: A multi-stage pressure/vacuum apparatus is disclosed for a bi-directional pneumatic delivery system or the like. The apparatus includes separated turbines or separated sets of turbines that are operated independently of each other to alternatively create pressure and vacuum conditions for an external system such as a pneumatic delivery network relying upon the inventive apparatus for pressure and/or vacuum generation. A common housing contains both turbine sets and defines a system of internal chambers and valve mechanisms between them. The valve mechanisms respond to internal pressures created within the housing by the turbines, and preferably also to gravity in order to control air flow patterns through the housing and between the housing and an external system. According to the present invention, the turbines of the two turbine sets can be operated concurrently at maximum capacity or separately if air power requirements are lesser.