Gear pumps have limits in food processing, especially when the product contains particles or has high viscosity. Several pump types offer better performance for these conditions. The right choice depends on viscosity, particle size, and hygiene requirements. Hansheng Automation can machine replacement parts for these pumps, such as rotors, screws, and wear components, to customer drawings.
Sanitary Screw Pumps: First Choice for High-Viscosity Foods
Where They Work Best
Sanitary screw pumps suit high-viscosity foods with fruit pieces or pulp, such as strawberry jam and tomato sauce. They also handle animal fats and paste dairy products. These materials are difficult for gear pumps because the meshing gears can crush particles or wear quickly.
Advantages
Screw pumps have no meshing clearance wear parts. They are not easy to jam. Shear force on the food is very low, so the original particle shape is preserved. They are compatible with CIP cleaning and easy to bring up to hygiene standards.
Limitations
Flow adjustment range is limited. Running at high speed can produce bubbles in the product. Screw pumps are not suitable for low-viscosity fluids at high flow rates.
Other Alternatives for Specific Scenarios
Cam Rotor Pumps
Cam rotor pumps handle foods with coarse fibers, such as mixed fruit and vegetable residue sauce. They also work with foods that contain some gas, such as whipped cream. These pumps have self-priming capability. The gap between rotor and pump body is large, so clogging is unlikely. Their hygiene level meets food-grade requirements.
Flexible Impeller Pumps
Flexible impeller pumps suit low-viscosity, easy-to-crystallize foods such as fructose syrup and malt syrup. They avoid metal debris from impeller wear. The impeller is made of food-grade rubber. It resists crystallization adhesion and has low maintenance cost.
Key Requirements for Replacement Pumps
Materials
Parts in contact with food, including the pump head and impeller, should be 316L stainless steel or FDA-approved food-grade rubber such as EPDM or silicone.
Hygiene Compliance
Pumps should have a domestic food production license or international food-grade hygiene certifications such as FDA 21 CFR or 3A.
Parameter Matching
Select pump flow based on food viscosity measured with a Brookfield viscometer and the maximum particle diameter. Keep speed in the 300 to 600 rpm range to avoid excessive shear.
Maintenance and Replacement Parts
Regular maintenance should cover seals, rotors, screws, and impellers. Worn parts affect both hygiene and flow performance. When replacement parts are needed, Hansheng Automation can machine them to drawing, including rotors, screws, and pump bodies.
Our precision custom machining capability is not limited to food processing pumps. Hansheng Automation also produces parts for filling machinery, printing machinery, and tobacco packaging machinery, along with precision components for yachts and RC cars. From single parts to small batch runs, we machine to customer drawings and deliver parts for assembly.
