Slurry Pump Spares Expeller DAM028A05 is used for 6/4 D-AH Slurry Pump, the function of an slurry pump expeller is to reduce the shaft pressure at the shaft seal area.When the slurry pump operation and the shaft rotates，the liquid in the expeller for AH slurry pump will rotate together. The rotating liquid will produce an outward centrifugal force, which against the liquid flowing to the mechanical seal and reduce the pressure. Also prevent the solid flow into the mechanical seal. It reduce the wear of mechanical seal grinding block to extend slurry pumps service life.
Slurry Pump Expeller is a very important slurry pump parts if the expeller seal is selected for the slurry pump. It can not only help seal the slurry pump, but also reduce the centrifugal force. The design and material of expeller is significant to its service life because it is also one of the wet parts, Tobee offers expeller in cast iron and high chrome materials for options.
Gland packing, expeller seals and mechanical seals are three key types of seals for centrifugal slurry pumps:
The expeller seal is an improvement on gland packing, this is where a rotary slurry pump expeller (often combined with pump-out vanes on the back of the impeller) reduces the hydraulic pressure at the shaft by pushing the liquid away from it. This can reduce leakage to nearly zero when the pump is operating at optimal conditions. However, when the centrifugal pump is stationery or running sub-optimally the liquid can still leak. Usually some form of gland packing is used in conjunction with the expeller seal used to minimise such leakage.
The main advantage of expeller seals is that the leakage is reduced without the significant expense of purchasing a mechanical seal. Also, as the gland packing is not pushed so tightly to the pump shaft, the wearing on the shaft (or shaft-sleeve) is reduced.
The disadvantages of expeller seals are that leakage still occurs, a critical factor when pumping corrosive or unpleasant liquids, and that a significant amount of power (typically 2% of total power) is needed to run the expeller.
Expeller seals are fitted as standard in slurry pumps for the quarrying industry due to lower maintenance requirements, and because some leakage is acceptable. For other industries this leakage cannot be tolerated. For example, in the recycling industry, when pumping digestate from anaerobic digestion plants, such leakage is unpleasant and can lead to corrosion of pump parts, increasingly mechanical seals are being fitted instead.
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