BKM Series – Magnetic Drive Plastic Pumps
Range of magnetic drive pumps engineered to enable dry-running operation and completely eliminate the mechanical seal. Flow rates up to 50 m³/h and heads up to 45 m, manufactured in high chemical-resistance thermoplastics for the most critical services.
Magnetic drive: absolute containment without mechanical seal
In the BKM Series, the motor drives an external magnet that transmits torque through a magnetic field to an internal magnet integral with the impeller. There is no shaft passing through the pump body and no dynamic seal, which translates into zero leakage to the outside and maximum safety for toxic, costly or hazardous products.
The magnetic system is engineered so that, during dry running, the impeller is positioned in a neutral position that avoids any friction. This allows extended dry-running operation without overheating.
The range is available in two main models according to the required level of chemical resistance: BKMC for standard services and BKMYS for the most demanding chemicals.
BKMC and BKMYS models
Two material configurations covering everything from general chemical services to the most aggressive processes with oxidising products and high temperatures.
| Component | BKMC | BKMYS |
|---|---|---|
| Pump body | PP / glass fibre | E-CTFE with carbon fibre |
| Shaft | Ceramic | Silicon carbide |
| Guide bushing | High-density carbon | High-density carbon |
| Recommended use | Acids, alkalis and standard chemical services | Oxidising products, high temperatures and demanding chemistry |
Technical specifications
| Flow rate | Up to 50 m³/h |
|---|---|
| Head | Up to 45 m |
| Drive system | Magnetic coupling — no mechanical seal |
| Dry running | Impeller in neutral position — no friction, no overheating |
| Connections | Flanges available as an option |
Available thermoplastics
The hydraulic casing and all wetted parts are manufactured in solid thermoplastics with high chemical resistance.
Why choose the BKM Series
Magnetic drive pumps are the mandatory choice when a leak through a mechanical seal is not acceptable: toxic, hazardous, expensive or high-purity products.
Protected dry-running operation
The magnetic system positions the impeller in a neutral position during dry running, avoiding friction and prolonged overheating.
Absolute containment
No mechanical seal, no leakage to the outside. The magnetic barrier ensures total containment of the pumped fluid.
No mechanical seal
The most common cause of failure and maintenance in conventional pumps — the mechanical seal and its periodic spares — disappears entirely.
Optional flange connections
DIN/ANSI flanges available as an option for seamless integration into the customer’s standard process lines.
ATEX versions
Certified configurations available according to Directive 2014/34/EU for explosive atmospheres with flammable solvents and chemicals.
Critical applications
HCl, HF, H₂SO₄, solvents, pharmaceutical products, toxic fluids and high-purity reagents.
FAQs about the BKM Series
The most common queries about magnetic drive pumps, the difference between BKMC and BKMYS models and when to choose this series over alternatives.
How does the magnetic coupling work?
The motor drives an external magnet; that magnet transmits torque to a second magnet integral with the impeller through a sealed wall (the internal plastic containment shell). There is no shaft passing to the outside, no mechanical seal and no possible leakage along the shaft. The inner wall acts as an absolute hermetic barrier between the fluid and the environment.
What is the difference between BKMC and BKMYS?
BKMC is built in PP with glass fibre reinforcement, with a ceramic shaft and a carbon bushing — it covers general chemical services such as dilute acids, alkalis, brines and most industrial chemicals. BKMYS is the higher-grade option: body in E-CTFE with carbon fibre, shaft in silicon carbide. It is the choice for oxidising products (nitric acid, concentrated hypochlorite), high temperatures and demanding chemistry such as HF, concentrated H₂SO₄ or specific solvents.
Can it really run dry without failing?
Yes, thanks to the specific design of the magnetic system: when the fluid is missing, the impeller shifts to a neutral position where there is no friction between the bushings and the containment shell. This allows dry-running for extended periods without overheating. It is a critical advantage over other magnetic pumps on the market that require the fluid to act as coolant for the internal bearings.
When should I choose BKM over a sealed pump?
Whenever occasional seal weep is not acceptable: toxic products (CO, phenols, chlorine dioxide), hazardous products (concentrated acids, flammable solvents), high-value chemicals (pharmaceutical products, pure reagents) or installations with strict emission regulations (VOCs, controlled atmospheres). Also when the maintenance cost of the seal (downtime, labour, spares) exceeds the initial additional investment.
What is the flow and head limit of this series?
The BKM Series covers flow rates up to 50 m³/h and heads up to 45 m. For higher flow rates with a zero-leakage requirement, TECNIUM offers special configurations or combinations of several units in parallel. For standard services with a conventional mechanical seal, the BH (motor pumps) or BN (process pumps) Series are recommended.
Is it compatible with ATEX atmospheres?
Yes. The BKM Series is available in ATEX-certified versions according to Directive 2014/34/EU for zones with explosive atmospheres. It is a common configuration in plants with flammable solvents and classified chemical processes, where the risk of sparks or overheating from a defective seal is already eliminated at source by the magnetic principle itself.
Tell us about your project and we will guide you
We will help you select the BKMC or BKMYS model based on your fluid, operating conditions and applicable regulations.
- Fluid analysis and selection between BKMC and BKMYS
- Hydraulic curve tailored to your duty point
- ATEX configuration if required
- Turnkey pumps with motor and instrumentation
Request information
Complete the form and our technical team will get in touch with you.
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