ANDRITZ High-pressure pump from the HP series is a multi-stage ring section pumps of robust construction with extra-large shaft sections for vibration-free running. For high output pressures, additional axial thrust balancing is provided by a balancing piston and catridge seal mounted on the pump shaft. The shaft sealing is either a mechanical seal or gland packing. In all the pumps the shaft is protected against wear and corrosion over its entire length by shaft wear sleeves, especially in the area of the shaft seals.