Gear pumps are rotary positive displacement pumps for liquids that are used for pumping and metering in the chemical industry, water treatment and food production.
The patented chemical gear pumps of the MARCH TEF-MAG® series (US patent no. 10,189,005 B2; European patent no. EP 3786416) are magnetic-drive, externally toothed gear pumps and were developed specifically for robust operation with highly corrosive chemicals. All wetted parts consist entirely of non-metallic materials and meet the requirements of ATEX Directive 2014/34/EU.
Gear pumps produce an almost pulsation-free positive flow according to the displacement principle with high differential pressure. The pump casings of the TEF-MAG® series are machined from robust solid material and corrosion-resistant plastics such as PP, PVDF, PEEK, PVC or PE. The wetted pump shafts are also made of non-metallic technical ceramics such as SSiC or Al2O3, which represents the best possible chemical resistance. The gears are made of high-performance plastics with self-lubricating properties.
The pumps of the TEF-MAG® series are therefore also able to pump low-viscosity liquids without problems. Power is transmitted from the drive to the pump without contact by strong NdFeB permanent magnets. As a result the pump works without any mechanical shaft seal, so that safe and leak-free pumping of corrosive, toxic and explosive liquids is ensured. Pumps for potentially explosive areas of Zones 1 and 2 can be supplied in corrosion-resistant and conductive plastics.
Design features
- Rotary positive displacement pump
- Gear pump, externally toothed
- Entirely non-metallic
- Chemical resistant
- Almost pulsation-free
- Leak-free
- Magnetic-drive
- Low NPSHR value
- Small flow rates
- High differential pressure
- Self-priming (wet)
- Constant control behaviour
- Integrated frequency converter available
- Pump also to ATEX 2014/34/EU
Technical data
| Nominal speed: | 1450 1/min (50Hz) |
| Nominal flow rate: | |
| TEF-MAG 200: | 200 l/h |
| TEF-MAG 1500: | 1500 l/h |
| TEF-MAG 3500: | 3500 l/h |
| Differential pressure: | max. 10 bar |
| System pressure: | max. 16 bar |
| Temperature: | max. 120°C |
| Density: | max. 1,9 kg/dm³ |
| Viscosity: | max. 5000 cP |
Materials
| Casing: | PP, PVDF, PVDF-EL, PVC, PEEK, PE |
| O-rings: | EPDM, Viton, Kalrez |
| Shafts: | Al2O3 >99%, SSiC |
| Gears: | PEEK-HPV, PTFEC, PVDF-CFR, PPS-HPV |
| Plain bearings: | PTFEC, carbon graphite, PPS-HPV, PEEK-HPV |
Applications
The pumps of this series have proven themselves wherever small flow rates of corrosive liquids have to be pumped pulsation-free under high pressure.
Typical applications are:
- Wastewater treatment
- Flocculation / precipitation
- Biodiesel plants
- Petrochemical and chemical industry
- Environmental technology
- Flue gas cleaning
- Chemical metering
- Laboratory technology
- Pressure boosting
- Metering
- Plant construction and process engineering