Hydraulic alternating volumetric pumping system

A pumping system for pumping fluids at low pressure comprising at least one pumping enclosure, the enclosure comprising at least one pipe for introducing a fluid to be pumped and at least one pipe for discharging the pumped fluid, the at least one pumping enclosure having a pipe which introduces a drive fluid and a pressure-reducer which reduces the pressure of the drive fluid transmitted to the fluid to be pumped, the pressure reducer together with an inside wall of the pumping enclosure forming a space which contains at least reduced pressure or a vacuum and wherein

• the at least one enclosure comprises a first part and a second part, the parts being connected by a pipe and the first part is a drive part comprising the pressure reducer and is provided with a device which introduces drive fluid and the second part provides two variable-volume chambers one of the chambers being in communication with introduction of pumped fluid and a discharge and another of the chambers being connected with a pipe through which the drive fluid passes.