Patent ID: 6893219

Claim:
A pump comprising a body, an actuating shaft, on which at least a first impeller and a second impeller are coaxially mounted, said first impeller being housed in a front chamber and said second impeller being housed in a rear chamber, the rear chamber connected to a fluid intake duct and a fluid delivery duct, wherein said front chamber is delimited by said body and by an interstage body; said rear chamber is delimited by said interstage body and by a shield wherein said interstage body comprises: a first volute associated with the first impeller and a second volute associated with the second impeller; a first discharge orifice associated with the first volute; a second discharge orifice connecting the second volute to the delivery duct; and wherein said body comprises a channel for throughflow of fluid from said front chamber to a means for supplying the fluid to the second impeller.