Pump/exchanger device

A combined pump/exchanger device comprising means defining an elongated passage having first and second ends, a port extending from said passage adjacent to but spaced from said first end, means within said passage at said first end for introducing a jet of compressed air into said passage axially of said passage at a point adjacent to but downstream of said port, said jet being of a cross section less than the cross section of said port, a valve in said passage intermediate said point and said second end, said second end being open, and an operating line connected to said port for coupling said device to an operating area, and said valve comprising means for selectively closing said passage and directing air under pressure to said operating line or opening said passage to said second end and creating a vacuum within said port and said operating line and causing an ingress of air, a regulator coupled to said port for controlling the pressure of the air discharged from said port, a pressure-vacuum gauge coupled to said port for measuring either the pressure or vacuum condition in said port, a safety relief valve coupled to said port to ensure the air pressure in said port does not exceed a selected air pressure, an adjustable vacuum control coupled to said port for selectively controlling vacuum in said port, a one way check valve permitting only the passage of said ingressed air from said operating line to said port and an on-off valve controlling the supply of compressed air to said passage and when set to an off position providing means for venting said passage relieving it of both air pressure or vacuum.