Seepex® Replacement Stators
Replacement stators for supported Seepex® BN, MD, BT and CS progressive cavity pumps, selected by complete model, pumping-element geometry, dimensions and service conditions.
ACCA evaluates the installed pump, required stator, elastomer compatibility and operating demands. Photographs, measurements, drawings or a physical sample may be needed to confirm special and legacy constructions.
Replacement Stators for Seepex® Pumps
The stator is the resilient half of the progressive-cavity pumping element. Its internal helical profile forms sealed cavities with the rotor. Correct geometry and controlled rotor-to-stator interference are essential for capacity, pressure performance and service life.
A replacement cannot be selected reliably from overall appearance alone. The complete pump model, element geometry, stage configuration, stator length, end construction, elastomer and operating conditions all matter.
Information Needed to Identify a Seepex® Stator
Complete Pump Model
Provide every letter, number and suffix available from the nameplate or equipment records.
Stator Dimensions
Include overall length, outside diameter, end diameters, flange or clamp details, bolt pattern and visible internal geometry.
Clear Photographs
Send full-length views plus close-ups of both ends, markings, connections and damaged areas.
Process Conditions
Identify the fluid, concentration, temperature, solids, abrasion, differential pressure, speed and cleaning chemicals.
Known Material
Provide the current elastomer when known and describe swelling, hardening, cracking or other prior failures.
Drawing or Sample
A dimensional drawing or physical sample can resolve unusual, modified and legacy constructions.
Seepex® Pump Families Supported
BN Series
Stators for supported standard block-pump models across established BN geometries and stage configurations.
MD Series
Metering-pump stators selected for model, geometry, flow duty, chemical compatibility and controlled performance.
BT Series
Stators for supported hopper and feed-pump arrangements handling viscous and solids-bearing products.
CS Series
Stators for supported food and hygienic pump configurations, subject to confirmation of materials and cleaning requirements.
Stator Elastomer Selection
Elastomer selection must reflect the complete fluid and operating environment. A compound that performs well in one service can swell, harden, soften or crack in another.
| Material Family | Typical Selection Considerations | Confirm Before Selection |
|---|---|---|
| NBR | Common industrial services, oils and general abrasion resistance | Fluid chemistry, temperature, aromatic content and cleaning agents |
| EPDM | Water-based fluids, selected chemicals and elevated-temperature aqueous service | Oil or hydrocarbon exposure, concentration and cleaning chemistry |
| FKM | Selected chemicals, fuels, oils and higher-temperature duties | Exact chemical blend, temperature, abrasion and low-temperature demands |
| Natural Rubber | Abrasive water-based slurries and selected solids-bearing service | Oil exposure, oxidation, temperature and chemical compatibility |
| CR, CSM and SBR | Application-specific chemical, weathering or abrasion requirements | Full fluid composition, temperature and prior material history |
| Other Compounds | Specialized process, food-contact or difficult chemical requirements | All regulatory, sanitation, cleaning and compatibility requirements |
Common Stator Wear and Failure Indicators
Abrasion and Scoring
Signs: enlarged cavities, grooves, reduced capacity or inability to hold pressure. Review solids, speed and rotor condition.
Swelling or Softening
Signs: high starting torque, restricted rotor movement or distorted elastomer. Review the complete fluid and cleaning chemistry.
Hardening and Cracking
Signs: brittle rubber, surface cracks or loss of sealing. Review temperature, age, oxidation and chemical exposure.
Dry-Run Heat Damage
Signs: burned, glazed, torn or separated elastomer. Correct loss-of-prime and dry-run protection issues before restart.
Chunking or Delamination
Signs: missing rubber, separation from the tube or rapid localized failure. Review debris, chemistry, pressure and assembly.
Slip and Capacity Loss
Signs: reduced output as differential pressure rises. Inspect the rotor and stator together before replacing one component.
Why the Rotor Should Be Checked Too
The rotor and stator function as a matched pumping pair. Rotor wear, corrosion, coating loss or dimensional change can prevent a new stator from delivering its expected performance and life.
| Inspection Point | What to Check | Why It Matters |
|---|---|---|
| Rotor surface | Scoring, pitting, corrosion, coating loss and deposits | Surface defects can damage the new stator and increase leakage |
| Rotor dimensions | Major and minor dimensions, eccentric geometry and wear pattern | Controls interference and cavity sealing |
| Stator bore | Uniformity, wear, swelling, cracking and localized heat damage | Shows whether failure is mechanical, chemical or operational |
| Operating history | Dry running, pressure events, speed changes and material changes | Helps prevent repeat failure after replacement |
Frequently Asked Questions
How do I identify a replacement Seepex® stator?
Provide the complete pump model, stator dimensions, clear photographs and process conditions. A drawing or sample may be needed for special or legacy constructions.
Does ACCA need a Seepex® OEM part number?
No. The identification process is based on the complete model, pumping-element details, dimensions and application information.
Which elastomer is best for my application?
The answer depends on the complete fluid composition, concentration, temperature, solids, abrasion, pressure, speed and cleaning agents. Prior material performance is also useful.
Should I replace the rotor with the stator?
Not automatically, but both should be inspected together. A worn or damaged rotor can reduce performance and shorten the life of a replacement stator.
Can ACCA support hygienic or food applications?
ACCA can evaluate supported configurations when the customer provides the required material, sanitation and cleaning criteria. Suitability and any compliance requirements must be confirmed for the specific application.
Return to the Seepex® Pump Parts hub to browse BN, MD, BT and CS family information.
Seepex® Replacement Rotors →
Seepex® Drive and Joint Parts →
Seepex® Mechanical Seals and Packing →
View All Seepex® Pump Parts →
Request a Seepex® Replacement Stator
Send the complete model, photographs, dimensions and service details. ACCA will review the information required to confirm a supported replacement.
Complete pump model
Stator photographs
Overall and connection dimensions
Known elastomer
Drawing or sample, when available
Fluid and concentration
Temperature and solids
Differential pressure and speed
Cleaning chemicals
Prior failure or wear pattern
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.