Sanitary Stainless Steel Milk Pump

Sanitary Stainless Steel Milk Pump

Milk, as a complex biological fluid, requires precise handling throughout extraction, pasteurization, storage, and packaging. Its unique physical properties—such as shear sensitivity, bacterial vulnerability, and significant viscosity variations—often pose significant technical hurdles for conventional pumping systems within the dairy industry.

Challenges in the Dairy Transportation Industry

1. Extreme Viscosity Variations and Flow Consistency The dairy industry involves a wide spectrum of textures, from water-like raw milk ( to highly viscous Greek yogurt, condensed milk, and cheese curd (up to 100,000+ cP). Conventional centrifugal pumps often experience a sharp drop in efficiency or suffer from cavitation when handling thicker dairy products. This leads to inconsistent flow rates, which negatively impacts the accuracy of downstream filling and dosing equipment. A high-performance positive displacement pump is required to maintain a constant, pulseless flow regardless of viscosity changes.

2. Shear Sensitivity and Fat Globule Damage Dairy products, especially cream, sour milk, and yogurt, are highly sensitive to mechanical shear. High-speed agitation from traditional pumps creates turbulence that breaks down delicate fat globules and denatures proteins. This results in fat separation (churning), foaming, and a watery texture, which compromises the dairy's natural "mouthfeel" and premium commercial grade. Utilizing a low-speed, gentle-action rotor design is critical to ensuring a pulse-free transfer that preserves the milk's natural biological structure and quality.

3. Biofilm Risks and Cleaning Inefficiency The high protein and lactose content in dairy makes it a perfect breeding ground for bacteria. If a pump has any "dead zones" or internal scratches (Ra > 0.8μm), milk residue can accumulate and form biofilms, leading to batch contamination and reduced shelf life. Many pumps fail to meet the rigorous requirements of CIP (Clean-in-Place) and SIP (Steam-in-Place) cycles because their internal geometry prevents 100% sterilization coverage, posing a constant risk to food safety standards.

4. Seal Failures and Product Loss Dairy fluids become extremely sticky when they dry or are exposed to heat. Lactose and milk proteins can quickly solidify on mechanical seal faces, causing abrasive wear and frequent seal failure. This not only leads to expensive product leakage and waste of high-value raw materials but also causes frequent unscheduled downtime in fast-paced dairy production lines, significantly increasing the total cost of ownership.

Bonve’s Engineering Solutions for the Dairy Industry

To overcome the inherent challenges of dairy transportation, Bonve has developed a series of high-performance sanitary stainless steel lobe pumps that integrate gentle handling and ultra-hygienic technology. Our solutions focus on ensuring production continuity, product integrity, and long-term reliability.

1. Low-Shear, Non-Contacting Rotor Technology Bonve utilizes specialized low-speed rotary lobe pump technology to address shear sensitivity. Our rotors (available in butterfly, tri-lobe, or multi-lobe configurations) are precision-engineered to maintain a pulse-free flow with generous internal clearances. This non-contacting design ensures that the milk or yogurt is moved gently without being "worked" or agitated, effectively preventing fat separation and preserving the natural creaminess and protein structure of the final product.

2. Ultra-Hygienic Surface Finish & Material Integrity To eliminate bacterial growth, Bonve pumps are manufactured from high-purity SS316L stainless steel. We utilize state-of-the-art CNC machining and electro-polishing to ensure an internal surface roughness of Ra < 0.8μm (and up to Ra < 0.4μm for high-end requirements). The casing is designed with a "self-draining" geometry that removes all dead zones, ensuring 100% effective sterilization during CIP (Clean-in-Place) and SIP (Steam-in-Place) cycles.

3. Specialized Balanced Sealing Systems Recognizing that dairy solids cause seal wear, Bonve offers customized flushed mechanical seals (single or double). These seals utilize SiC, Tungsten Carbide, or Carbon faces and feature a design that prevents lactose and proteins from solidifying on the sealing surfaces. By incorporating a low-pressure water flush, our seals remain cool and clean, ensuring a leak-free operation and dramatically extending the maintenance intervals compared to standard pumps.

4. Integrated Thermal Management (Heating Jackets) For products like butter, margarine, or processed cheese that require temperature control to prevent solidification, Bonve pumps can be equipped with integrated heating jackets. By circulating hot water or steam through the pump cover and casing, the system maintains a consistent media temperature, ensuring a smooth, low-torque startup and preventing product crystallization within the pipeline.

Why Choose Bonve Rotary Lobe Pumps for Dairy?


Interchangeable
1.Interchangeable rotors, one pump multi-purpose.

2.Targeted seal for specific application, ensure zero leakage.

Easy maintenance
1.Compact structure, easy assembling and disassembling.
2.Maintenance in place, easy cleaning. CIP able and SIP able.
3.Few wearing parts, low maintenance.

Long life
1.All main parts proceed by CNC, high precision fabrication.
2.No contact between the rotors, rotors and pump chamber.
3.six bearings with separate arrangement, high balance.
4.Adjustable seal ring extends the shaft life.
5.Axis key synchronous adjustment, no rotor collision problem.

Bonve has an advantage over lobe pump that no other company can match.

1.Rotor:The error of the rotors processed by CNC is extremely small. The unique rotor perfectly seals the inlet and outlet of the pump. The vacuum degree of the pump is up to -0.095MPA. The rotor material and type can be selected according to the characteristics of the pumped product.

2.Shaft: The transmission shaft is processed by CNC machining center, which has characteristics of high precision, high bending strength and strong wear resistance.

3.Pump cavity: The pump cavity is sealed by a pump cover that can be opened quickly, enabling quick maintenance of the pump. The pump body is processed by CNC machining.

4.Gears:High-precision, High-Standard synchronous gears have good meshing, smooth transmission, low noise, and excellent bearing capacity.

5.Mechanical seal:The seal material and type are selected according to the characteristices of the pumped product, to ensure zero leakage, no pollution, and more environmental production.

6.Bearings: Six bearings arranged in a separate arrangement increase the concentricity of the pump operation, enhance the bearing capacity of the shaft and make the pump running more stable, thereby increasing the service life of the shaft and the mechanical seal.

7.Gear box: The gear box is processed by CNC, with high precision, high concentricity and strong versatility.

8.Spindle:We use splines the bearings and spindle, makes the pump less likely to slip. The high-precision spline makes the pump run more smoothly, and the service life is much higher than that of its peers.

More applications

In addition to milk transfer applications,Bonve stainless steel lobe pumps are widely used in the food, dairy, confectionery, beverage, and wine industries.  Typical transfer media include: chocolate, condensed milk, cheese, mayonnaise, yogurt, honey, syrup, sucrose, ketchup, tomato paste, butter, concentrated juice, jam, ice cream,  yeast slurry, meat paste, jelly, condiments, soy protein, various beverages, and wine.

 Working Principle  

Bonve lobe pumps basically consist of two lobe rotors, which rotate synchronously driven by a pair of synchronous gears in the gearbox. The rotors are driven by the main shaft and sub-shaft to rotate in a synchronous reverse direction, which changes the pump capacity, builds up high vacuum and discharge pressure, thus an efficient pumping is formed. Gap is kept between the rotors and between the pump casing, no friction, long life, no damage, no physical and chemical reaction to the pumped products.

Bi-wing rotor diagram

Tri-lobe rotors diagram

Main Parts of the Complete Pump

Bonve complete pumps are usually composed of bare shaft pump, coupling and its guard, geared motor and baseplae. With your order, bare shaft pump or complete pump is supplied.

Bare Shaft Pump Structure

Based on the port direction, we have the pump with horizontal port and vertical port to meet your site installation.

Structure Details

Complete Pump Types

 Technical Parameters

Note:
1. Tested medium: water. 
2. Speed, flow rate, electrical power and pressure will be varified according to different product properties.

 Selection Guidelines

8 steps for your guideline to select Bonve pump
1. Your product name
2. Product viscosity in pump, line and at rest

3. Are there any solids present, if so what are they and percentage concentration
4. Specific gravity

5. Capacity required

6. Pumping temperature

7. Discharge pressure or sketch of pipework system
8. Suction pressure or sketch of pipework system

About us

BONVE is a Chinese leading manufacturer in ROTARY LOBE PUMPS and HOMOGENIZER MIXERS. Providing its customers with customized pumping and mixing solutions and solving their problems during the production.

Bonve pumps and mixers are widely used in food, dairy, beverages, chemical, pulp&paper, soaps&detergents, pharmaceuticals, pesticide, coatings etc. By 2024, Bonve served 8,000+ customers in various industries and 100,000+ pumps running in the worldwide.

Time and again companies specify Bonve pumps as the "standard" equipment for  their manufacturing processed. We are looking forward to be partner with you.

Certificate

Bonve ISO9001, ISO14001, ISO45001 certificates ensure quality consistency, compliance reliability, environmental responsibility, and operational efficiency, delivering trustworthy and sustainable partnerships for our clients.

With CE and FDA certificates,Bonve pumps are globally recognized. These certificates open doors to major markets, and they're a testament to our pumps excellence for you.

How customers' comments on Bonve Lobe pump 

Comment on the pumps surface finish

We worked with are-seller in food industry and they are very happy withBonve lobe pump surface smooth finish and price.

If your team is dealing with similar pain points—whether it's subpar materials, inconsistent finishes, or non-compliant equipment—let's connect. We're here to deliver the same peace of mind and performance to your operations.

Feedback on Bonve lobe pump inner structure and running

We worked withthecompanies in chemical industry and they are satisfied with our pump silent and smooth running. If you want to get rid of such usage troubles of yourexisting pumps, we are ready to provide you with the same high-value solution.

FAQ

1. Warranty Policy
Standard: 15 months from manufacturing date.
Service: Free replacement parts within 3 workdays for non-human quality issues.
Extended warranty: Available upon request (e.g., for projects).
2. Operation Guidance
Provided with full English manual (installation, operation) and training files (maintenance, troubleshooting).
Remote technical support available if needed.
3. Shipping Arrangement
Partner with reliable forwarders; support sea (standard) or air freight.
Share your nearest port/airport for CIF quotes (cost + insurance + freight).
4. Payment Terms
TT (Telegraphic Transfer) or LC (Letter of Credit).
5. Delivery Time
Bare shaft pumps: 7 workdays (standard).
Complete pumps with motor: 20 workdays (standard).
6. Packaging
Solid fumigation-free plywood cases.
7. Pre-Order Spec Confirmation
We send a spec form (flow rate, head, etc.) for confirmation; technical drawings/photos available if needed.
8. Post-Warranty Support
Paid parts (preferential prices, 3-5 workdays delivery).
Paid on-site/remote technical help; customized annual maintenance plans for long-term clients.
9. Custom Solutions
Supported: Adjust material (stainless steel/cast iron), parameters (flow rate/head), or design (vertical/mobile).
Lead time: 20-30 workdays (varies by complexity); progress updates provided.

Contact Us

We welcome you to contact us for a Dairy Transfer Pump solution if have any demand.  

Contact person: Anna Chang

Tel: +86-574-87769810 Fax: +86-574-62962898

Mobile/Whatsapp/Wechat: 0086-13375846933

Email：bvsales1@bonvepumps.com