Food-Grade Rotary Lobe Pump

Food-Grade Rotary Lobe Pump

Regarding the customer's inquiry about a food-grade rotary lobe pump (rotary pump) for conveying thick pastes and sauces, based 

on the provided parameters (viscosity 2000-3000 mPa·s, flow rate 20 m³/h, 5kW-3 phase-440V-50Hz, inlet/outlet 2 inches), the following

 analysis is conducted from three dimensions: technical compatibility, selection rationality, and industry application experience, and

 optimization suggestions are provided:

I. Technical Compatibility Analysis

Viscosity Handling Capacity

Roller lobe pumps (rotary lobe pumps) are ideal for conveying high-viscosity media. Their pulsation-free conveying principle avoids 

media separation or clogging. The recommended model CYB17.5-3Y has a pump head made of SS304 (food-grade stainless steel) 

and a mechanical seal design, capable of withstanding a viscosity range typically from 1-1,000,000 mPa·s, fully covering the customer's

 requirement of 2000-3000 mPa·s.

Flow Rate and Pressure Matching: The customer requires a flow rate of 20 m³/h. The recommended model has a rated flow rate of 

20 m³/h (perfectly matching the requirement) and a discharge pressure of 0.6 MPa, which can meet the resistance requirements during

 the conveying process (such as pipe friction, height differences, etc.).

The original consultation requested a 5kW motor, but the recommended model has been upgraded to a 7.5kW reducer drive

 (YE3 high-efficiency motor, IP55 protection rating). This adjustment is likely based on the following considerations: High-viscosity 

media require higher torque, and a 7.5kW motor ensures stable operation; a reducer drive can reduce the speed (e.g., from 1450 rpm 

to 500-800 rpm), reducing shear force and protecting media components (such as particles or fibers in sauces).

Inlet/Outlet Size Compatibility: The customer requires an inlet/outlet of 2 inches (DN50). The recommended model has a 77/77 chuck 

diameter (approximately DN80). Although the diameter is slightly larger, it can be adapted using a reducer, and the larger diameter can 

reduce the flow rate, reducing wear on pump internals and extending service life.

II. Verification of Selection Rationality

Material and Hygiene Standards: The SS304 pump head meets food-grade requirements (e.g., FDA, 3A certification), with a surface 

finish ≤0.8μm, meeting CIP/SIP cleaning needs and preventing bacterial growth.

Mechanical seal type (e.g., double-end face seal) prevents leakage and ensures hygiene and safety.

Structural Advantages: The cam rotor design (e.g., a three-lobe rotor) creates a continuous sealed volume, providing pulsation-free 

delivery, suitable for sauces containing particles (e.g., chili sauce, ketchup).

The rotor-pump body clearance is adjustable (e.g., through elastomer compensation technology) to accommodate different viscosities,

 preventing leakage caused by clearance expansion under high pressure.

Energy Efficiency and Maintenance: The 7.5kW motor with a reducer, while exceeding the customer's original power requirements, 

reduces energy consumption (flow regulation is achieved through frequency conversion control, avoiding frequent start-stop cycles).

Modular design (e.g., detachable rotor assembly) facilitates quick maintenance and reduces downtime.

III. Industry Application Experience Support

Similar Case Studies: An international food company used a similar model rotary pump to transport chocolate syrup (viscosity approximately

 5000 mPa·s, flow rate 15 m³/h). Leakage issues were resolved using elastomer compensation technology, and the pump operated without

 failure for over 3 years.

A domestic sauce factory used an SS304 cam pump to transport chili sauce containing particles (viscosity 2500 mPa·s, flow rate 25 m³/h).

 Equipped with a wear-resistant coated rotor, its lifespan was extended to 18 months.

Customer Repurchase Rate Reference: According to market research, the repurchase rate of similar food-grade rotary pumps in the sauce 

industry exceeds 60%, mainly due to their stability, hygiene, and low maintenance costs.

IV. Optimization Suggestions

Power Confirmation: It is recommended to discuss the necessity of a 7.5 kW motor with the customer. If the customer insists on 5 kW, it is

 necessary to verify whether the torque is sufficient (high-viscosity media require a torque ≥ N·m, specifically calculated based on the pump

 curve). Diameter Compatibility Solutions: We offer reducing couplings from 2 inches to 77mm chucks, or custom DN50 pump heads (delivery

 time and cost to be confirmed).

Seal Upgrade: For media containing corrosive components (such as acidic sauces), we can upgrade to a fluororubber mechanical seal for 

enhanced corrosion resistance.

Email: sales01@cxflowmeter.com

WhatsApp: 008618049841995