Magnetic-coupling pumps—seal-less and leak-free for aggressive and critical media
Pumps with magnetic couplings are the preferred solution when corrosive, toxic, or water-polluting fluids need to be pumped safely and without emissions. Thanks to the seal-less design, torque is transmitted via a magnetic coupling system, eliminating the need for a dynamic shaft seal.
Harton Anlagentechnik GmbH develops and supplies these pump systems as chemical centrifugal pumps made of plastic and metal—designed for maximum operational reliability, media resistance, and HSE compliance.
Harton Anlagentechnik GmbH develops and supplies these pump systems as chemical centrifugal pumps made of plastic and metal—designed for maximum operational reliability, media resistance, and HSE compliance.
Why Choose Pumps with Magnetic Couplings from Harton Anlagentechnik GmbH?
The magnetic coupling system transmits torque through a hermetically sealed gap housing. This results in a completely seal-less system with no potential leak points.
Our design specifically accounts for aggressive media such as acids, alkalis, halogenated compounds, and strong-odor substances. Plastic materials such as PP, PVDF, or PTFE linings prevent corrosion and enhance operational safety.
The design takes into account not only the flow rate and head, but also:
- medium density and viscosity
- Vapor pressure and degassing behavior
- NPSH conditions and inlet configuration
- Temperature and pressure ranges
Technical Specifications
| Flow Rate Q | 0.5-300 m³/h |
| Delivery head H | 5 - 90 m |
| System Pressure | up to 16 bar |
| Temperature range | -10 °C to +120 °C |
| Viscosity | 0.3-200 mPa·s |
| Solid content | up to about 3% |
| Gas content | up to about 10% |
Important restriction:
Dry running is not permitted without a protective measure, as the bearings and split housing rely on continuous cooling by the medium.
Dry running is not permitted without a protective measure, as the bearings and split housing rely on continuous cooling by the medium.
Design Types, Variants, and System Concepts
Pumps with magnetic couplings are available aschemical centrifugal pumps in various designs:
The magnetic coupling system consists of an inner and outer magnet with a gap pot serving as a separating barrier. Torque transmission is precisely tuned to the operating point, medium, and start-up conditions.
Distinction:
- Inline design
- Block design
- Process design
- Skid integration with peripherals
The magnetic coupling system consists of an inner and outer magnet with a gap pot serving as a separating barrier. Torque transmission is precisely tuned to the operating point, medium, and start-up conditions.
Distinction:
- Compared to mechanical seals: completely leak-free
- Compared to metallic pumps: corrosion-resistant, but with a limited pressure/temperature range depending on the material
The selection of materials is based strictly on chemical resistance, temperature, and mechanical stress.
Pump housing:
Bearing materials:
Elastomers:
Technical Evaluation:
Abrasive or solid-laden media are permitted only within defined limits, as the internal bearings and split housing are sensitive to particles.
Pump housing:
- PP (cost-effective, limited temperature range)
- PVDF (higher chemical and thermal resistance)
- ETFE / PTFE (highly resistant linings)
Bearing materials:
- Carbon / Graphite
- Silicon carbide (SiC)
- Aluminum oxide (Al₂O₃)
Elastomers:
- EPDM
- FKM
- FFKM
Technical Evaluation:
- Stress Corrosion Cracking
- Permeation and diffusion
- Thermal aging
- Particle Wear
Abrasive or solid-laden media are permitted only within defined limits, as the internal bearings and split housing are sensitive to particles.
Magnetic drive pumps are used in particular for:
Critical factors:
For certain media, a degassing or filtration concept is an essential part of the design.
- corrosive acids and alkalis
- toxic and water-polluting media
- strong-smelling or volatile substances
- substances containing chloride
Critical factors:
- Gas and vapor content → Impact on pumping stability
- Vapor pressure → Effect on NPSH
- Particles → Effect on bearings and canister
- Temperature → Impact on materials and service life
For certain media, a degassing or filtration concept is an essential part of the design.
Seals, Safety, and HSE Policy
The system is designed entirely without seals. The gap pot serves to provide hermetic separation.
Safety-related aspects:
For plastic housings, electrostatic charging is also evaluated, and a conductive design is used if necessary.
Safety-related aspects:
- Monitoring of gap pot and bearing temperature
- Dry-run protection via sensors
- Drip pan or secondary protection
- ATEX-compliant design available
For plastic housings, electrostatic charging is also evaluated, and a conductive design is used if necessary.
Drives, Control, and Energy
- Electric motor (IE3/IE4) with coupling
- Speed control via frequency converter
- Adjustment of the operating point to prevent cavitation
The magnetic coupling is designed for the required torque. Critical operating points include, in particular:
- Cold start with high viscosity
- Blockages or particle jamming
- Operation outside the characteristic curve
Integration, Installation, and Peripherals
- Short, flow-optimized suction line
- Adequate NPSH reserve
- Filter or strainer design for particulates
- Degassing for volatile media
- Measuring points for pressure, temperature, and flow
In addition, a protection system against dry running must be implemented.
Monitoring, Operational Safety, and Protective Functions
Monitoring parameters:
A rise in temperature is a key indicator of dry running or bearing problems.
- Pressure and differential pressure
- Flow
- Motor power
- Bearing temperature
- Sleeve temperature
A rise in temperature is a key indicator of dry running or bearing problems.
Quality, Testing, and Documentation
- Functional Test
- Leak Test of the Gap Pot
- Performance Test (Q/H)
- FAT / optional SAT
- CE and ATEX compliance
- Material Certificates
Service, Maintenance, and Lifespan (TCO)
With seal-less pumps, the focus shifts:
Wear drivers:
- fewer seal replacements
- greater focus on bearings and monitoring
Wear drivers:
- Dry running
- Gas content
- Particles
- Temperature spikes
Advantages of Harton's Magnetic Coupling Pumps
- Completely leak-free system
- High resistance to aggressive chemicals
- Reduced HSE risks
- No shaft seal required
- Process-reliable design by our engineering team
- Integrated protection and monitoring concepts
Submit a Technical Inquiry
For the design, we need:
- Fluid and composition
- Temperature, viscosity, and density
- Flow rate and head
- NPSH and installation configuration
- ATEX Requirements
Types and Variants of Our Magnetic Coupling Pumps
Our magnetic-coupled pumps cover a wide range of industrial applications and offer customized solutions for the safe, leak-free handling of aggressive, viscous, or sensitive fluids. Depending on the process requirements, different designs are used —ranging from horizontalchemical centrifugal pumps made of PP or PVDF for highly corrosive acids and alkalis, to precision gear pumps for dosing applications in the pharmaceutical and biotechnology industries, to PFA-lined heavy-duty models for particularly demanding chemical processes.
The portfolio is complemented by self-priming variants for simplified system integration, as well as vertical pump systems for efficient tank emptying and wastewater treatment. All models benefit from hermetic separation via the magnetic coupling, which ensures maximum operational reliability without dynamic seals.
Engineering and application-specific design are carried out by Harton Anlagentechnik GmbH, with a particular focus on efficiency, process stability, and the safe handling of critical media.
The portfolio is complemented by self-priming variants for simplified system integration, as well as vertical pump systems for efficient tank emptying and wastewater treatment. All models benefit from hermetic separation via the magnetic coupling, which ensures maximum operational reliability without dynamic seals.
Engineering and application-specific design are carried out by Harton Anlagentechnik GmbH, with a particular focus on efficiency, process stability, and the safe handling of critical media.
This design represents the industry standard for the transfer of highly corrosive acids and alkalis. Our engineers design these variants primarily for electroplating and surface treatment applications, where absolute corrosion resistance of components in contact with the media is essential. The hermetic seal provided by the magnetic coupling prevents any leakage. Our expertise is particularly evident in the hydraulic validation process, which is designed to minimize the risk of cavitation when handling critical media with high vapor pressure.
| Seal | sealless (magnetic coupling) |
| Lift height H | up to 60 m |
| Materials | PP, PVDF |
| Pressure | PN 10 - PN 16 |
| ATEX | Zones 1 & 2 (optional) |
| Efficiency | 45 - 75 % |
| Performance | 0,12 - 75 kW |
| Rotational speed | 1.450 - 2.900 min⁻¹ |
| Temperature | -20 °C bis +100 °C |
| Viscosity | up to 200 mPas |
| Solids | max. 5% (non-abrasive) |
| Gas content | ＜ 2 % |
| Volume flow rate Q | 0,5 - 400 m³/h |
| NPSH | Depends on the medium (2 m or more) |
These small-volume positive-displacement pumps are used for the precise dosing of aggressive media in the pharmaceutical industry and biotechnology. In our second generation, we validate customized system designs that guarantee extremely high dosing accuracy while ensuring leak-free delivery. The challenge here lies in the viscosity-temperature behavior of the fluid, which our specialists technically validate in advance through precise characteristic curve analyses.
| Lift height H | N/A (displacement principle) |
| Materials | PEEK, PTFE, PVDF |
| Pressure | up to 10 bar |
| ATEX | Optional |
| Efficiency | 85-95% (by volume) |
| Performance | 0,09 - 2,2 kW |
| Rotational speed | 500 - 3.000 min⁻¹ |
| Temperature | -10 °C bis +60 °C |
| Viscosity | 0,5 - 5.000 mPas |
| Solids | Completely free of solids |
| Gas content | 0 % |
| NPSH | Low inlet pressure required |
| Volume flow rate Q | 0,1 - 2.000 l/h |
| Seal | Magnetic coupling |
For the chemical and petrochemical industries, our specialists rely on metal-reinforced pumps with a thick PFA lining. This combination brings together the mechanical robustness of a cast housing with the universal chemical resistance of fluoroplastics. Since 1984, we have been using this solution for applications where standard plastics reach their limits due to thermal or mechanical stresses. During system integration, our project developers pay particular attention to minimizing eddy current losses in the can to increase energy efficiency.
| Solids | Recommended for use without solids |
| Gas content | 0 % |
| NPSH | ca. 3,5 m |
| Volume flow rate Q | 1 - 150 m³/h |
| Seal | Hermetically sealed |
| Lift height H | up to 90 m |
| Materials | Ductile iron with PFA lining |
| Pressure | up to 16 bar |
| ATEX | Zone 1 (Standard) |
| Efficiency | 50 - 70 % |
| Performance | 1,5 - 45 kW |
| Rotational speed | 1.450 - 2.900 min⁻¹ |
| Temperature | -30 °C to +150 °C |
| Viscosity | up to 100 mPas |
This variant is the solution for applications in which the fluid is stored below the pump level. Our engineers rely on special housing geometries with an integrated evacuation stage. For our customers, this significantly simplifies piping design. A particular challenge is dry-run protection during the suction process, which we ensure through customized system designs and integrated sensor technology.
| Gas content | Intake phase up to 100% throttle |
| NPSH | Suction height up to 5 m |
| Volume flow rate Q | 0,5 - 50 m³/h |
| Seal | Magnetic coupling |
| Lift height H | up to 35 m |
| Materials | PP, PVDF |
| Pressure | up to 6 bar |
| ATEX | Zone 2 |
| Efficiency | 35 - 55 % |
| Performance | 0,75 - 11 kW |
| Rotational speed | 1.450 - 2.900 min⁻¹ |
| Temperature | up to +70 °C |
| Viscosity | up to 50 mPas |
| Solids | Not recommended |
In wastewater treatment and for tank drainage, our technicians recommend the vertical design. The advantage lies in the space-saving system integration directly within the tank, whereby the magnetic drive can be located outside the medium or hermetically sealed. The engineering expertise of Harton Anlagentechnik GmbH ensures optimal design of the immersion depth and shaft guidance to prevent vibrations even with fluctuating NPSH values and to enhance process reliability at the customer’s facility.
| Rotational speed | 1.450 - 2.900 min⁻¹ |
| Temperature | up to +80 °C |
| Viscosity | up to 150 mPas |
| Solids | possible under certain conditions |
| Gas content | up to 3% |
| NPSH | uncritical due to the submersible design |
| Volume flow rate Q | 1 - 80 m³/h |
| Seal | Magnetic Coupling / Split Housing |
| Lift height H | up to 40 m |
| Materials | PP, PVDF, PE |
| Pressure | PN 6 |
| ATEX | Yes, provided it is properly enclosed |
| Efficiency | 40 - 60 % |
| Performance | 0,55 - 15 kW |
Relevance for Engineers and Technical Buyers
The design is based on flow rate, head, fluid properties (density, viscosity, vapor pressure, gas and solid content), NPSH conditions, and the temperature and pressure range, with particular attention paid to chemical resistance and operating conditions that prevent impermissible dry running.
Key factors for procurement include the design as a seal-less magnetic drive pump, the permissible operating range (up to 16 bar, -10 °C to +120 °C), the choice of materials (PP, PVDF, PTFE linings, and SiC/graphite bearings), as well as defined limits for gas and solid content.
Relevant requirements include HSE-compliant, leak-free design with proven tightness, material- and medium-specific resistance tests, pressure and functional tests, as well as quality-assured manufacturing and acceptance processes, including documentation of operating limits.
FAQs by Industry
Select an industry
Magnetic-Coupled Pumps in the Chemical Industry
Semiconductor Industry: Supply of High-Purity Media
Electroplating: Surface Coating
Water and Wastewater Technology: Environmental Technology
Pharmaceutical Industry & Cosmetics: Sterile Processes
Energy & Power Generation Industry: Water Treatment
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