Alfa Laval M Gear Hygienic Gear Pump

Alfa Laval M Gear hygienic gear pump basics

The Alfa Laval M Gear is a compact stainless steel positive displacement gear pump for moving low volumes of clean fluid in hygienic and industrial filling applications. It is used for dosing, sampling and bulk filling, and it is easy to adapt to OEM filling machines. Seven Star LLC supplies M Gear pumps in Oman and the GCC as an independent supplier based in Muscat.

Three models, with different pump head sizes, cover flow rates up to 1500 l/h, differential pressures up to 7 bar and temperatures up to 60°C. The pump runs at up to 1360 rpm. This page explains how to size it, how it works and what to keep as spares.

M Gear model range and typical limits

These are range limits. A given model will have lower limits that must be read from its performance curve.

M Gear technical specifications

How the M Gear pump works

Two multi-lobe gears turn against each other in a fully swept chamber. As the teeth disengage on the inlet side a cavity opens and fills with fluid, and the fluid is carried round the housing wall. On the outlet side the teeth mesh again, closing the cavity and pushing the fluid out. Because the displaced volume per revolution is nearly fixed, output follows speed closely, which is why gear pumps suit dosing and precise filling.

The gears sit between PTFE bush bearings inside the main body, which keeps alignment accurate and supports efficient operation. As the pump can run in either direction, the flow can be reversed without modification, which is useful for emptying lines or recirculation.

M Gear in the system and related Alfa Laval pumps

M Gear is usually found at the end of a process, on filling machines and dosing skids. It is complemented by Alfa Laval centrifugal pumps for high-volume transfer, and by rotary lobe, circumferential piston and twin screw pumps where larger volumes, viscous media or gentle handling are required.

Because the gear pump is positive displacement, a relief or bypass is needed on the discharge side to protect the pump and piping if a valve is closed. Fit a filter on the suction if the fluid can carry particles.

Selection and ordering checklist for M Gear

• Required flow in l/h and the number of fillings or dosing cycles per hour.
• Differential pressure, including the pressure drop of filler nozzles and pipe.
• Fluid viscosity, density and temperature (up to 60°C for the range).
• Pump head size among the three models and the speed needed.
• Mechanical seal and O-ring material for the fluid and cleaning chemicals.
• Motor or drive: fixed speed or variable speed, voltage and frequency.
• Mounting: freestanding bracket or integration on OEM machine.
• Connection type and hygienic requirements.

Installation, commissioning and maintenance of M Gear

Mount the pump so that the inlet is flooded or at least has a short suction run, and avoid running it dry. Check rotation direction against the inlet port, because the pump is bi-rotational and can be connected either way. Fit a pressure relief on the discharge and flush the line before starting.

Service is simple because the mechanical seal, cover plates, backplates and O-rings are interchangeable and the pump can be dismantled in place. Keep a spare seal and O-ring kit, inspect gear tips and bushes for wear at regular intervals and check noise or loss of flow as early signs of wear.

M Gear applications in Oman and the GCC

M Gear pumps are suited to filling and dosing of beverages, sauces, dairy liquids, cosmetics, cleaning products and chemical samples. In the GCC the filling lines of food, water treatment chemicals and personal care manufacturers are the main users, often in air-conditioned halls with hot wash cycles.

As the temperature limit is 60°C, check that hot CIP or steam flushing does not exceed the pump rating and follow the manual for cleaning procedures.

Practical notes on M Gear dosing accuracy

Dosing accuracy depends on keeping the pump full, the speed stable and the discharge pressure steady. If a filler runs many different products, plan the cleaning routine between changeovers, and note that gear clearances are tight, so hard particles in the product can score the gears and bushes. A strainer at the inlet is a cheap form of insurance.

M Gear compared with other hygienic pumps

Information to send with an RFQ for M Gear

• Fluid, viscosity and temperature.
• Target flow and pressure.
• Filling or dosing cycle details.
• Seal and elastomer choice.
• Drive and electrical data.
• Quantity, delivery location and date.

Documents and quotation

Send the M Gear head size, fluid and duty data and we will confirm which documents are available for the pump.

Seven Star LLC quotes M Gear pumps and service parts for Oman and the GCC from Muscat. We reply with availability and lead time on request.