LEWA MAH, MBH and MLM micro-metering pumps
Smallest flow rates, highest efficiency.
In the demanding sectors of the oil and gas industry, gas odorization, and energy production, precision in metering minuscule fluid amounts is critical, often adjusted to variable reference values.
The LEWA MAH, MBH, and MLM micro-metering pumps are engineered for such specialized requirements. These pumps boast an exceptionally broad control range for ultimate metering flexibility, ensuring precise small flow rates. Equipped with four solenoid power sizes, they cater to a comprehensive spectrum of applications.
Additionally, the series offers smaller pump types with non-Ex-protected solenoids for operations requiring higher pressure. Coupled with two specially designed control systems, these micro-metering pumps from LEWA adapt seamlessly to a multitude of specific tasks, embodying efficiency and versatility in micro-metering technology.
Key Benefits of LEWA Micro-Metering Pumps: Precision & Flexibility
LEWA micro-metering pumps excel as precision metering devices, featuring a hydraulically actuated metal diaphragm coupled with a solenoid actuator for unmatched accuracy and control.
Extremely large adjustment range
Precision is our strength: LEWA micro-metering pumps provide maximum metering flexibility through an extremely large control range of 1:1000. This allows us to fulfill the most stringent requirements for sensitive metering tasks in various industries.
Safety and reliability in extreme operating states
For us, safety and reliability comes first: The pump is not subjected to damage, even after operating errors occur or in extreme operating states. We offer maximum protection for user and machine through built-in safety mechanisms - not only when excess primary pressure is present, but also when the pressure or suction line is closed.
Low maintenance and service life costs
LEWA micro-metering pumps have minimal life cycle costs. They achieve this advantage compared to other micro-metering pumps with high energy efficiency, low operating and maintenance costs and an extremely long lifetime of the diaphragm and process valves.
Vacuum sealed
LEWA micro-metering pumps are not only leak-proof, but also absolutely odor-tight. This ensures that no contamination can occur.
Suitable for virtually all fluids
The micro-metering pumps are suitable for many different fluids. Whether they are dangerous, toxic, abrasive, viscous, environmentally harmful or sensitive fluids, the user-specific configuration always gives you the correct diaphragm metering pump.
Integrated pressure relief valve (only for MLM)
A pressure relief valve in the hydraulic part of the diaphragm pump prevents potential overload situations in operation. This valve is individually adjustable and can therefore be adapted to different operating situations.
Superior metal diaphragm technology
The metering pumps are equipped with sophisticated metal diaphragm technology, which enables discharge pressures up to 500 bar. At the same time, they still meter very precisely at an accuracy of ± 1%.
Dry-run safe
The pumps are dry-run safe. No sliding seals or packages are inserted. This guarantees the highest process safety.
Compliance with common standards
LEWA micro-metering pumps fulfill common standards such as DVGW G280. They are also explosion-protected up to EX-Zone 1.
Features of LEWA Micro-Metering Pumps: Engineered for Precision
MAH series without explosion protection
For non-hazardous applications, we manufacture our MAH-series microflow pumps also without explosion protection. Thus we can offer you even more economical micro metering pumps.
Specially adapted control unit
Rely on precision and our experience: We offer you several specially adapted controls for hazardous and non-hazardous zone (for example, MPM, MSG, OLK, OKR.)
Flow meters
A pump is only as good as its control and regulation system. That's why we provide precise flow meters in different variations for accurate control.
Special design materials
If the process demands it, wetted parts such as pumps heads and valves will be made of special materials such as stainless steel 316/316L (1.4401/1.4404), Hastelloy or Duplex steel and PVC.
Heating and cooling jacket
With heating and cooling jackets, our pumps are suitable for almost any temperature and can convey fluids at low temperatures or extreme heat.
Customized valves
LEWA uses numerous special types of valves such as specially hardened valves for liquified gases or valves with minimal dead space for the food and pharmaceutical production.
Integration into process control systems
The signal acquisition of process control systems is achieved analogously or digitally. Flow rate is adjusted via electric or pneumatic stroke adjustment, alternatively by motor drive (FU).
Complete documentation
In the process of documentation, we consider your requirements and provide inspection records, print samples, diagrams of output characteristics and registration papers on request.
Technical Data
The LEWA series M micro-metering pump is available in numerous performance and size variants. We are happy to assist you in selecting the suitable pump for your application.
Drive unit data
With the various micro-metering pump variants MAH, MBH and MLM – available with or without explosion protection – we cover flow rates from 0.01 to 55 l/h and discharge pressures from 1 to 560 bar.
| Type | Without Ex protection | With Ex protection | ||
|---|---|---|---|---|
| Flow rate [l/h] | Pressure [bar] | Flow rate [l/hr] | Pressure [bar] | |
| MAH min. | 0,01 | 1 | 0,01 | 30 |
| MAH max. | 1,6 | 50 | 1,6 | 4 |
| MBH min. | 0,07 | 1 | 0,08 | 1 |
| MBH max. | 0,14 | 75 | 2,4 | 50 |
| MLM min. | - | - | 0,01 | 1 |
| MLM max. | - | - | 55 | 560 |
Installation dimensions
Various sizes for any intended use: MAH, MBH and MLM differ significantly in their dimensions, MAH and MLM are each available in two different sizes.
| Type | L [mm] | B [mm] | H [mm] |
|---|---|---|---|
| MAH 3 | 102 | 110 | 260 |
| MAH 4/5/8 | 102 | 120 | 260 |
| MBH 6/8/10 | 155 | 195 | 510 |
| MLM 15/40 -3 | 450 | 140 | 260 |
| MLM 15/40 -20 | 450 | 180 | 260 |
Industries
Applications
LEWA MAH, MBH, MLM micro-metering pumps can be found in numerous applications:
Proportional metering of fluids in variable main currents, e.g. inline blending, natural gas odorization, additive supply, regulation of physical material values to main currents or large volumes with a good mixture in higher-level control circuits, e.g. coloring, viscosity, pH values.
Metering of silane
LEWA systems meter any silane type reliably, precisely as well as in constant consistency and purity, regardless of chemical or physical attributes or process requirements.
More Details
Oil-free CO2 cooling with LEWA pumps
LEWA diaphragm metering pumps provide a constant oil-free CO2 cooling of silicon sensors in particle physics research center CERN.
More Details
Dilution of emulsifiers
With its metering systems and diaphragm pumps, LEWA offers the right solution for recipe-compliant emulsifier dilution.
More Details
Extracting omega-3 fatty acids using supercritical CO2
LEWA offers optimum pump solutions for these processes, which perform their tasks safe, permanently reliable and efficiently
More Details
Dispersing
With the diaphragm metering pumps and streamlined suspension valves, LEWA offers the suitable solution for the metering of fluids with solid particles.
More DetailsDownloads
LEWA Micrometering pumps (USA)
Micro-metering pumps with diaphragm technology for metering fluids in laboratories and test centers.
1 MB
| pdf |
18.02.2022
LEWA Mikrodosierpumpen (DE)
Mikrodosierpumpen mit Membrantechnologie für die Dosierung von Flüssigkeiten in Labor und Technikum.
2 MB
| pdf |
18.10.2025
LEWA Micrometering pumps (EN)
Micrometering pumps with diaphragm technology for metering fluids in laboratories and test centers.
2 MB
| pdf |
18.10.2025
