The W series from KRAL is primarily used when dirty or low-viscosity media are used. Robust polymer coating and continuous flow rates at differential pressures up to 120 bar – these features are combined in the KRAL W series screw pump.
Operation, materials, components.
- Delivery rate: 15 to 290 l/min.
- Max. differential pressure: 120 bar.
- Viscosity: > 1 mm²/s.
- Max. temperature: To 180 °C, magnetic coupling to 300 °C.
- Installation: Wet or dry.
- Spindle housing: Nodular cast iron EN-GJS-400, polymer-coated or other material options.
- Screws: Steel, nitrided.
Optimum pump for special requirements.
Pumped fluids such as cooling lubricants are difficult liquids. They contain abrasive dirt, mostly metal residues, and must be pumped at high pressure. In addition, they have a very low viscosity of only about 1 mm²/s.
In the KRAL screw pump of the W series, the screw material and the casing coating have been designed for improved sliding properties in such a way that low viscosity fluids can be pumped with high efficiency.
The running casing is coated with a resistant polymer that can absorb particles. The balancing cylinder of the screw pump has orifice insertions to reduce the leakage rate, therefore efficiency remains high.
