Speak to our Experts: 02380 252 325
Speak to our Experts: 02380 252 325
The MG Rotary Lobe Pump is a series of positive displacement, self-priming Industrial Rubber Lobe Pumps with a reversible rotary design and features rubber lobes perfect for the transfer of viscous, fibrous, abrasive and solids laden products. The range covers 9 models with capacities up to 300 m³/hr, discharge pressures up to 5 bar, suction lifts up to 5 m and solids handling capacity up to up to 30 mm. Swan necks on the suction and discharge can be provided to aid in self-priming applications.
These Industrial Rotary Lobe Pumps are classified as Rotary Positive Displacement Pumps, this means the capacity remains independent from system pressure which means that they can deliver the same flow rate across their rated pressure. This ensures that the pumps are suited to mobile applications where discharge conditions are constantly changing or for fixed-in-place applications where process fluid viscosities and densities vary.
Pump bodies are constructed from GG 30 continuously cast spheroidal graphite Iron with wear plates in wear-resistant steel & triple seal design as standard.
Lobes can be supplied in several different elastomer coatings including NBR, SBR, XNBR, EPDM and FPM. Lobe replacement is facilitated by a front pull-out design.
Different drive options are available to suit a wide variety of site-specific requirements such as ATEX rated motor, hydraulic drives for truck mounting and diesel/petrol drives for portable systems.
Particular care has been taken in the design of these units to improve pump life and limit maintenance intervals in arduous and challenging applications. Each pump model has been through stringent and severe laboratory testing and field tests before being launched. Each pump is then individually tested before delivery.
| Housing | GG30 Cast Iron |
| Lobes | Cast Iron Coated in NBR, SBR, XNBR, EPDM and FPM |
| Shoulders / Wear Plates | Wear Resistant Steel (400 HB) |
| Shaft Seals | Double Radial Seals, Grease Lubricated & sliding on Hardened Bushes. Standard Mech Seals or Reinforced Seals (prepared to withstand higher operating pressures; equipped with a flushing system) on request |
| Manifolds | Galvanised Steel |
The MG Industrial Rotary Lobe Pumps are available as three different drive types: electrically, hydraulically and diesel driven.
Model | ||||
| Detail | MG 7 | MG 14 | MG 20 | MG 27 |
| A | 1500 | 1500 | 1500 | 1500 |
| B | 740 | 740 | 740 | 740 |
| C | 780 | 820 | 820 | 850 |
| Weight, Kg | 270 | 310 | 345 | 410 |
| Flow Rate, l/min @ 460 rpm (3 Bar) | 550 | 1100 | 1600 | 2000 |
| Required Power, kW | 5 | 10 | 15 | 17 |
| Motor Power, kW | 5.5 | 11 | 18.5 | 18.5 |
| Protection Class | IP 55 | IP 55 | IP 55 | IP 55 |
| Voltage / Frequency | 380 / 50 | 380 / 50 | 380 / 50 | 380 / 50 |
Model | ||||
| Detail | MG 7 | MG 14 | MG 20 | MG 27 |
| A | 645 | 710 | 775 | 865 |
| B | 270 | 270 | 270 | 270 |
| C | 500 | 500 | 500 | 500 |
| Weight, Kg | 132 | 142 | 160 | 187 |
| Displacement, cm³/rev | 34 | 44 | 61 | 72 |
| Oil Pressure, Bar | 120 | 140 | 140 | 140 |
| Speed, rpm | 2050 | 2050 | 2050 | 2050 |
| Motor Connections | ¾” | 1” | 1¼” | 1¼” |
| Flow Rate, l/min @ 540 rpm (5 Bar) | 650 | 1300 | 1800 | 2500 |
Model | ||||
| Detail | MG 7 | MG 14 | MG 20 | MG 27 |
| A | 1430 | 1550 | 1700 | 1700 |
| B | 750 | 750 | 845 | 845 |
| C | 930 | 930 | 1960** | 1960** |
| Weight, Kg | 390 | 430 | 660 | 700 |
| No. of Cylinders | 2 | 2 | 2 | 2 |
| Power, kW | 14 | 18 | 23 | 23 |
| Displacement, cm³ | 1120 | 1332 | 2078 | 2078 |
| Max Discharge Pressure | 5* | 5* | 4.5* | 5* |
| Flow Rate, l/min @ 520 rpm | 650 | 1300 | 1800 | 2400 |
2 synchronised lobes revolve within the pump housing. The lobes do not come into contact with one another, this is prevented by timing gears located within the gearbox. As the lobes rotate, they create an expanding cavity at the pump suction which draws the fluid into the pump. The fluid is trapped by the lobes in pockets as they rotate which is then conveyed around the outside of the lobes, passing any solids with it along the way, and discharging out of the pump casing.
The pump shaft support is facilitated by bearings located outside of the fluid in the gearbox, limiting the discharge pressure to 5 bar.
Capacity is directly related to the speed at which the pump is operated at and the flow is reversible by simply changing the direction of rotation of the drive.
MGIndustrial Rubber Lobe PumpViscosity Changes vs Suction Pressure, MG 7, 14, 20, 27 & 40:
Changes in viscosity can have a direct impact on the suction pressure to the pump. As temperatures drop the fluids viscosity will increase and therefore result in increases pressure drops on the suction pipework and over pressure in the discharge line. To prevent anomalies during operation and risk of cavitation, it is recommended to maintain an adequate suction pressure. Before start-up it is always recommended to ensure that the system’s NPSHa is higher than the pump’s NPSHr value. For reference, below is a chart detailing the NPSHr valves of the models MG 7, 14, 20, 27 & 40.
The MG Series Rotary Lobe Pump is perfect for industrial applications due to the rubber lobes that are ideal for low viscosity applications and provide reliable fluid suction. If you’d like to discuss the options available within the series, contact a member of the team today.
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