The Alfa Laval M Gear is an external gear pump designed to move low-volume fluids with high accuracy and repeatability. As a positive displacement gear pump, it is the right choice when consistent metering, gentle product handling, and hygienic operation are all required simultaneously. Its design addresses three common pain points in filling and dosing lines: contamination risk, maintenance downtime, and integration complexity.

What is an M Gear pump and how does it work?

The M Gear is an external, rotary positive displacement pump. Fluid transfer is achieved by two contra-rotating multi-lobe gears that mesh inside a fully swept pump chamber. As the gears unmesh on the inlet side, they create expanding cavities that draw fluid in. As they re-mesh on the outlet side, those cavities collapse and push fluid out at a pressure determined by system resistance. Because every rotation displaces a fixed volume, flow rate is directly proportional to shaft speed — making the M Gear an inherently precise dosing pump and metering pump without the need for additional flow-control hardware.

A single mechanical seal on the drive shaft provides maximum leakage control. Only two specific seal face combinations are permitted: Stainless Steel with Carbon, or Silicon Carbide with Silicon Carbide. This deliberate limitation ensures seal integrity across the full operating range.

Is the M Gear a positive displacement pump?

Yes. The M Gear is a rotary positive displacement pump. Unlike centrifugal pumps, which rely on dynamic velocity to transfer fluid, the M Gear traps and displaces a defined volume with each shaft revolution. This means output flow is largely independent of downstream pressure — a critical advantage in dosing and filling applications where accuracy must not drift as system backpressure changes. For buyers comparing pump technologies, Euroflow also supplies a range of rotary lobe pumps and centrifugal pumps for higher-flow or self-priming duties.

How is the M Gear pump built?

The pump body houses two precision-aligned multi-lobe gears mounted between specially developed PTFE bush bearings. All product-wetted steel components are manufactured from 316L / 1.4404 stainless steel, with an internal surface finish of Ra ≤ 0.8 µm. Gears are available in PTFE-impregnated 316L or plain 316L, both FDA-approved. The bracket and flange frame adaptor are aluminium; the coupling guard is 304 stainless steel at 1.2 mm thickness. This material selection balances corrosion resistance, regulatory compliance, and structural rigidity in a compact envelope.

Hygienic and aseptic M Gear pumps for food, beverage, and pharmaceutical lines

The M Gear is designed for uninterrupted production across hygienic and industrial applications in the food, chemical, and personal care industries. FDA-conforming elastomers — available in EPDM or FPM — combined with 316L wetted surfaces and a smooth internal surface finish of Ra ≤ 0.8 µm make the pump suitable for sanitary duties where product purity is non-negotiable. The fully swept chamber minimises dead zones, reducing the risk of product entrapment and simplifying cleaning routines. For process engineers evaluating pharmaceutical-grade fluid handling, Euroflow's guide to pharmaceutical pumps provides additional context on pump selection criteria.

Which M Gear pump fits your process line?

The M Gear family covers three models — M200, M210, and M220 — each with distinct dimensional envelopes and pressure ratings. The M200 and M210 share the same compact footprint (132 mm × 132 mm body) and support a maximum inlet pressure of 7 bar, while the larger M220 (159 mm × 159 mm body) is rated to 4 bar inlet pressure. All models operate up to a maximum temperature of 60 °C. Connection options span BSP thread, bore hole, Tri-Clamp, SMS, and DIN 11851, giving integrators and OEM equipment builders the flexibility to match the pump to existing pipework standards. Motor sizes run from 0.25 kW to 0.55 kW at both 50 Hz and 60 Hz, keeping energy consumption low even in continuous-duty filling lines.

For buyers already operating Alfa Laval rotary lobe equipment, the M Gear complements larger positive displacement pump families such as the Alfa Laval OptiLobe or the Alfa Laval SX in process lines where a dedicated low-volume dosing or metering duty exists alongside higher-flow transfer duties. Browse the complete M Gear collection at Euroflow to identify the right model for your application.