Seepex® BN Series Pump Parts
Model-based replacement rotors, stators, coupling rods, drive shafts, joint components and seals for supported Seepex® BN progressive cavity pumps.
Use the complete BN model and required component as the starting point. Dimensions, photographs, drawings or a physical sample may be needed to confirm the installed construction.
Replacement Parts for Seepex® BN Pumps
The Seepex® BN range uses a close-coupled block construction in which the pump drive train and pumping element form a compact assembly. The rotor turns eccentrically within the stator while the articulated drive components transmit torque and accommodate the rotor motion.
Replacement selection depends on more than the nominal size. The complete BN model, pumping-element geometry, stage configuration, metal construction, stator elastomer, sealing arrangement and critical dimensions can all affect fit and performance.
ACCA reviews supported BN components around the installed model and service conditions. Process fluid, temperature, solids, abrasion, differential pressure and operating speed are particularly important when selecting the rotor, stator and seal materials.
Seepex® BN Model and Geometry Coverage
The following sizes carry forward the established coverage published by ACCA. Always provide the complete model designation because the size and stage suffix alone may not identify every construction detail.
BN 6L Geometry
Long-geometry configurations commonly used for industrial transfer.
BN 6 Geometry
Single-stage size families represented in ACCA’s established coverage.
BN 12 Geometry
Multi-stage configurations requiring confirmation of full model and pumping element.
BN 24 Geometry
Higher-stage configurations where dimensional and material confirmation is especially important.
BN Replacement Components
Rotors
Replacement rotors reviewed for BN size, stage geometry, material, dimensions, interference and surface treatment.
Stators
Replacement stators selected around the complete model, elastomer, process fluid, temperature, solids and pressure.
Drive and Joint Parts
Coupling rods, drive shafts, pins, bushings, sleeves, retainers, seals and related wear components.
Coupling Rods
Torque-transmission components confirmed by complete model, joint construction, material and dimensions.
Drive Shafts
Replacement shafts reviewed for geometry, keyway, seal surface, material and connection details.
Joint Repair Components
Pins, bushings, sleeves, retaining components, seals, O-rings and related hardware.
Mechanical Seals
Seal components evaluated around the installed arrangement, shaft dimensions and process conditions.
Packing Components
Packing, gland and related components reviewed against the installed BN sealing configuration.
Special or Legacy Parts
Uncommon components evaluated using photographs, measurements, drawings or physical samples.
BN Rotor and Stator Selection
| Selection Item | Information Needed | Why It Matters |
|---|---|---|
| Complete BN model | Every letter, number and suffix shown in the model | Separates sizes, geometries, stages and construction variants |
| Required component | Rotor, stator, drive component, seal or other part | Determines which dimensions and construction details must be verified |
| Stator elastomer | Known compound, process fluid and temperature | Affects chemical compatibility, swelling, hardness and service life |
| Rotor construction | Metal, coating, dimensions and surface condition | Affects corrosion resistance, abrasion resistance and rotor-stator fit |
| Operating conditions | Fluid, solids, pressure, speed and temperature | Supports material selection and evaluation of premature wear |
How to Request Seepex® BN Parts
Send the complete BN designation exactly as it appears on the equipment documentation or nameplate.
State whether you need a rotor, stator, coupling rod, drive shaft, joint part, seal or another component.
Provide clear overall and close-up views showing connections, ends, keyways, sealing surfaces and wear.
Include overall length, diameters, connection measurements and other critical dimensions available.
Provide fluid, temperature, solids, pressure, speed and known material requirements.
Common BN Service Applications
Wastewater and Sludge
Sludge transfer, polymer, digester feed and dewatering-system service.
Chemical Processing
Viscous chemicals, polymers, resins, adhesives and dosing applications.
Pulp and Paper
Stock, coatings, starch, mill sludge and process additives.
Mining and Minerals
Abrasive slurries, reagents, lime and solids-bearing fluids.
Food and Beverage
Viscous and shear-sensitive products where suitable materials and sanitation requirements are confirmed.
General Industrial Transfer
Oils, coatings, waste streams and other viscous or solids-bearing fluids.
Frequently Asked Questions
What information identifies a Seepex® BN replacement part?
Start with the complete BN model and required component. Add clear photographs and dimensions. A drawing or sample may be needed for uncommon or modified constructions.
Does the BN size alone identify the correct part?
No. The size and stage suffix may not identify every material, seal, connection or construction detail. Provide the complete model.
What BN parts can ACCA supply?
Supported parts may include rotors, stators, coupling rods, drive shafts, joint components, mechanical seals, packing parts and other wear components.
Should a worn BN rotor and stator be inspected together?
Yes. Their dimensional relationship creates the pumping seal, so wear on either component can affect slip, capacity and pressure performance.
How is a BN stator elastomer selected?
Selection considers the complete process fluid, temperature, solids, abrasion, cleaning agents, differential pressure and prior service history.
Can ACCA evaluate a special or obsolete BN component?
Yes, when sufficient photographs, measurements, drawings or a physical sample are available to evaluate form, fit and function.
Return to the Seepex® Pump Parts hub for MD metering pumps, BT feed and hopper pumps, and special or legacy equipment.
Request Seepex® BN Series Pump Parts
Send the complete BN model, component required, photographs and available dimensions. ACCA will review the information and determine what is needed to confirm a supported replacement.
Complete BN model
Component required
Clear photographs
Critical dimensions
Material and operating details
BN size and geometry
Component construction
Dimensional requirements
Material requirements
Quotation requirements
Trademark Disclaimer: Seepex® is a registered trademark of its respective owner. References to Seepex® are used solely to identify compatible equipment. ACCA Pumps is an independent aftermarket manufacturer and is not affiliated with or endorsed by the trademark owner. Read the full disclaimer.