- Features & Benefits
- Other Info
Dickow’s HZS Series are self-priming multi-stage centrifugal pumps designed for handling liquids in industrial and municipal water supply, for tank farms, for offloading of rail cars and trucks, filling of storage tanks, feeding hydrant systems on air fields and for other applications where priming of empty suction pipes is required. The HZSA version is suited to pumping liquified petroleum gas (LPG) with low NPSH-requirements.
The performance range covers capacities up to 190 m³/h and differential heads up to 400m with a maximum operating temperature of 180°C.
The HZS-pump shaft is carried by generously dimensioned grease-lubricated double-row angular ball bearings and a roller bearing, located outside the pumped liquid. These bearings can be regreased through grease nipples, provided in the bearing cover. The HZSA-pumps are provided with a Silicon Carbide sleeve bearing on the suction side which is - to avoid dry running - connected to the discharge side.
With a wide selection of materials and the possibility of applying several shaft sealing systems as well as a hermetically sealed permanent magnetic coupling, the HZS/HZSA-pumps are suitable for handling almost all kinds of liquids which are free of abrasive solids and of suitable viscosity.
The closed impellers are hydraulically balanced by wear ring gaps and balance holes, the antifriction bearings are carrying only minor loads and further balancing devices are not necessary.
The side channel stage is capable of evacuating the suction line if it is initially filled with liquid. During the priming phase, the side channel stage works like a positive displacement pump. The displacement effect is created by a rotating liquid ring which enters and exits the side channel in a piston fashion by each rotation. This is generated by an interrupter in the side channel which separates suction and pressure area. The piston effect conveys the gas from suction to discharge side. The priming stage works automatically, no auxiliary vent equipment required.