Rotorflo R21S MS Stainless Steel Rotary Lobe Pump - Standard Build, DIN Fittings, excl. Pressure Relief Valve / 25mm
18156
The Rotorflo R21S MS is a Rotorflo R21S MS stainless steel rotary lobe pump – Standard Build.
Specifications
| Brand | Rotorflo |
| Item code | 830015816 |
| Model | Rotorflo R21S MS |
| Build | Standard Build, DIN Fittings, excl. Pressure Relief Valve / 25mm |
| Type | Positive displacement rotary lobe pump, 316 stainless steel wetted parts – gentle, low-shear, self-priming, reversible; flow proportional to speed |
| Inlet / outlet | Ø25 mm |
| Displacement | 5.4 m³/h at 1 000 rpm (0.5 m³/h per 100 rpm) on water at 20 °C |
| Speed range | 100–1 000 rpm (geared motor or variable speed drive) |
| Maximum differential pressure | 12 bar up to 700 rpm, 9 bar at 1 000 rpm (≈ 122.4 m / 91.8 m head) |
| Maximum viscosity | 90 poise at 100 rpm down to 3.5 poise at 1 000 rpm |
| NPSH required | 1.6 m at 100 rpm to 6 m at 1 000 rpm |
| Power at 1 000 rpm | 0.8 kW at 1 bar, 1.1 kW at 2 bar, 1.5 kW at 4 bar, 1.9 kW at 6 bar, 2.2 kW at 8 bar, 2.3 kW at 10 bar, 2.3 kW at 12 bar |
| Speed (rpm) | 200 400 600 800 1000 |
| Flow on water, low pressure (m³/h) | 1.1 2.2 3.2 4.3 5.4 |
| Maximum differential pressure (bar) | 12 12 12 11 9 |
| Maximum viscosity (poise) | 50 23 13 7.5 3.5 |
| NPSH required (m) | 1.6 2.3 3 3.9 6 |
Technical Data and Downloads (PDF)
Download the technical information for the Rotorflo R21S MS Stainless Steel Rotary Lobe Pump - Standard Build, DIN Fittings, excl. Pressure Relief Valve:
Rotorflo R21S Performance Curve
57 kB | Download
Rotorflo Selection Data
42 kB | Download
Rotorflo Pump Dimensions
1 MB | Download
Rotorflo Performance Curves catalogue section
519 kB | Download
Applications
- Hygienic transfer in food, dairy and beverage plants
- Pharmaceutical and cosmetic products
- Viscous, shear-sensitive and solids-laden liquids
Features
- Stainless steel rotary lobe design – gentle, low-shear pumping
- Hygienic, CIP-cleanable construction
- Standard, heated or jacketed build as stated
- Fittings and pressure relief valve options
Need help choosing or want a price?
Our pump team will check the right size for your flow and head and give you a quote.
WhatsApp us: 082 516 2248 Get a Quote / Size my pump info@pumps.co.za
