The VLE Series consists of self-priming volumetric pumps where the flow rate varies proportionally with the rotational speed. The working principle relies on the synchronized and counter-rotating lobes that seal the material in the cavity between the lobes and the pump casing, transferring it from the suction port to the discharge port. VLE pumps are suitable for the transfer of viscous and paste-like products such as waste water, oils, paints, pastes, sludge, and dirty water. They are capable of pumping liquids containing solid foreign particles up to a maximum size of 30 mm. They are self-priming up to a depth of 5 m (with water).