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2026-10-29 
Industry News 
As a focused Rotors for BN Series supplier, Jiangsu Sharp Pump Co., Ltd. supplies precision-ground replacement rotors engineered for direct interchangeability with BN series progressive cavity pumps. Our rotors are produced on CNC grinding equipment to maintain the rotor-stator compression line and volumetric efficiency of the original pump, without requiring modifications to the existing drive train or casing.
We position these rotors for maintenance, repair and overhaul programs in wastewater treatment, chemical processing, food and beverage, and other duties where BN series pumps handle viscous, abrasive or shear-sensitive media. The range covers multiple pitches and diameters to match specific BN pump models and pressure stages. Based in Jingjiang, China, we combine in-house rotor turning, grinding and surface treatment with ISO-certified quality management.
Application Fit and Operating Boundaries
BN series rotors are specified where the pump must maintain stable flow against discharge pressure while handling media such as dewatered sludge, high-viscosity chemicals, crude oil, food pastes and abrasive slurries. The rotor geometry works with the corresponding Stators for BN series to form sealed cavities that move product with low shear and low pulsation.
- Wastewater and sludge: thickened or dewatered sludge with abrasive solids; hard chrome or tungsten carbide coating extends service life.
- Chemical processing: corrosive or reactive fluids; stainless steel grades resist chemical attack.
- Food and beverage: sanitary media requiring AISI 304/316 surfaces and smooth finish.
- Oil and gas: crude oil or produced water with high mechanical load; duplex stainless steel provides strength.
Material Grades and Surface Treatment
We select rotor material and surface hardening according to the pumped medium, temperature and abrasive load. The standard material is high-strength tool steel for non-corrosive abrasive fluids. For sanitary or corrosive chemical applications we offer AISI 304, 316 and 316Ti stainless steel. Duplex stainless steel is available for extreme environments requiring high mechanical strength.
| Material Grade | Typical Application | Surface Hardening Option |
|---|---|---|
| High-Strength Tool Steel (standard) | Non-corrosive, abrasive fluids | Hard Chrome Plating (HCP) or Tungsten Carbide Coating |
| Stainless Steel AISI 304 / 316 / 316Ti | Sanitary or corrosive chemical applications | Optional HCP for abrasive service |
| Duplex Stainless Steel | Extreme environments requiring high mechanical strength | Optional Tungsten Carbide Coating |
Surface hardening is applied where abrasive particles would otherwise accelerate rotor wear. Hard chrome plating and tungsten carbide coating increase resistance to abrasive media and help maintain the compression line over a longer service interval.
Rotor Geometry and Configuration
Each rotor is manufactured to match the stator pitch, diameter and eccentricity of the target BN series pump. We produce rotors in various pitches and diameters to optimize flow rate and pressure stage according to the specific pump model. The rotor is supplied as a plug-and-play component; no modification to the existing pump housing, coupling rod or drive shaft is required.
- CNC grinding maintains dimensional accuracy and concentricity.
- Rotor pitch and diameter are matched to the BN series stator for correct compression and volumetric efficiency.
- Connection end is machined to the original drive interface for direct installation.
- Custom geometries are produced from customer drawings, samples or key dimensions when samples are not available.
For other pump series, our Progressive Cavity Pump Rotor range covers NM, AE, C and I&ID models.
Quality Control and Acceptance
Each batch of BN series rotors is tested for hardness, surface roughness and concentricity to meet international industrial standards. Our in-house manufacturing covers rotor turning, grinding and surface treatment, supported by ISO-certified quality management. We provide material certificates and test reports for project documentation.
Before dispatch, rotors are inspected against the dimensional data of the corresponding BN series pump model. For complete pump assemblies, water testing is performed after assembly; for replacement rotors, dimensional and surface inspection confirms fit and finish.
Installation and Maintenance Support
Because the rotor is machined as a direct replacement, installation follows the original BN series pump procedure. We provide disassembly and assembly guidance to reduce installation errors and support smoother maintenance. For customers who require on-site assistance, paid installation service is available based on project needs.
Rotor service life depends on media abrasiveness, operating speed and discharge pressure. We recommend keeping the rotor and stator as a matched set; when the rotor is replaced, the stator condition should be checked to maintain volumetric efficiency. Our BN series progressive cavity pump documentation includes maintenance intervals and wear inspection guidance.
Information We Use to Configure Your Solution
To prepare an accurate rotor proposal, we use the following project data. This allows us to confirm the correct pitch, diameter, material and surface treatment for the existing BN series pump.
- BN series pump model and serial number, if available.
- Flow rate, discharge pressure and operating speed.
- Transferred liquid name, solids content, pH and working temperature.
- Existing rotor drawing, sample or key dimensions (major diameter, pitch, length, connection detail).
- Current stator material and condition.
- Required surface hardening and material grade.
- Quantity, delivery target and any special packaging requirements.
Frequently Asked Questions
Are these rotors interchangeable with existing BN series pumps?
Yes. Our BN series rotors are precision-engineered for 100% dimensional accuracy and are designed as plug-and-play components to match BN series pump stators without modification to the existing pump.
What materials are available for BN series rotors?
We offer high-strength tool steel as standard, stainless steel AISI 304 / 316 / 316Ti for sanitary or corrosive chemical applications, and duplex stainless steel for extreme environments requiring high mechanical strength.
Can you produce a rotor from our drawing or sample?
Yes. We provide customization service. You can send rotor or stator samples or drawings, and we will design and produce a rotor with a good match and performance. If samples are not available, we will tell you which important sizes to provide.
What quality checks are performed on each rotor?
Each batch is tested for hardness, surface roughness and concentricity to meet international industrial standards. Material certificates and test reports are available.
What is the typical delivery time for BN series rotors?
Spare parts usually take 1-2 weeks based on different models, but most spare parts are in stock and can be delivered in 3 days. Delivery method can be DHL/UPS/FEDEX for small parcels or sea LCL for larger packages.
