Semi-open impellers have a fixed wear plate opposite them. The gap between them is critical for the performance data (Q, H, η). For abrasive fluids, the gap gets bigger and bigger and causes a reduction in the nominal pump values. All pumps in the EO and EOS families are equipped with a wear plate that can be adjusted from the outside and with which one can reset the impeller gap back to its original size – thereby allowing the pump to regain its specified delivery characteristics. That is, one can, as a rule, delay the need to replace it. As an alternative, under conditions of high wear, the casing cover can also be equipped with a replaceable wear insert.
Ordinary radial impellers are known for their limited transport of gas content which results in a drastic reduction of output to the point where delivery stops altogether. Since its founding in 1947, Egger has focussed on this problem. A special blade geometry guarantees the delivery of gas contents up to 25%, as has been proven in numerous reactor loop installations in the chemical industry. Closely related to this is the high suction capability; that is to say, this hydraulic family exhibits low NPSHR values.
Egger has been known for decades for pulp pumps in the pulp and paper industry. Fibres, high air content, etc. – these are all everyday occurrences that are very challenging. The process pump production series EO / EOS with their special blade geometries guarantees even for this case the safe delivery of consistencies as high as 8% atro.
The triple-bladed EOS-impeller has a large, open spherical channel and is used primarily for slurries and suspensions of larger solids. The blade leading edge and the opposing wear plate have special designs that make it possible to transport even long-fibre components, such as occur in wastewater.
Gathering the large number of specific hydraulic properties in a hydraulic system and pairing them with sound construction make the EO / EOS production series genuine process pumps that are valued as such by our clients all over the world. Suited for a wide range of abrasive, corrosive and viscous fluids and even multiphase suspensions, containing solids and high gas content.