Low Shear Pumps: Gentle Handling of Shear-Sensitive Media
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slug: /applications/low-shear
metaTitle: Low Shear Pumps | Gentle Handling
title: Low Shear Pumps: Gentle Handling of Shear-Sensitive Media
navTitle: Low Shear
metaDescription: How to move shear-sensitive media — emulsions, crystals, flocculated product — without degrading them, and the low-shear pump types that suit the duty.Content blocks
content.introA low shear pump moves delicate media without breaking them down. Shear is the stress a fluid feels when one layer slides past another — and high shear splits emulsions, crushes crystals and breaks up flocculated products. A low shear pump moves it gently, at low speed and without tight, fast clearances. Channel Pumps sizes these for shear-sensitive duties.
content.heroimage slotbrief only — not generatedalt: A low-shear positive displacement process pump for delicate media, on a clean studio ground
register: product
A clean hero shot representing a low-shear pump — a hygienic stainless steel rotary lobe process pump with generous flow passages, on a clean near-white studio ground, soft even light, a single calm mid-blue accent, tight confident crop. Subject-true, calm, modern. Clean, modern product photography, not salesy. Even soft studio light, near-white ground, a single accent colour, crisp focus, fine detail. Photorealistic.
content.gallerycontent.gallery.headingHigh shear versus low shear
content.gallery.images[]1 itemcontent.gallery.images[0]image slotbrief only — not generatedalt: Diagram contrasting a fast centrifugal impeller with a slow low-shear rotary lobe pump
register: diagram
A flat comparison diagram contrasting two pumping actions: on the left, a fast-spinning centrifugal impeller forcing fluid through a narrow clearance, labelled as high shear; on the right, a slow rotary lobe pump carrying fluid gently through open passages, labelled as low shear. Labelled nodes and directional connectors, generous whitespace, two-colour restraint using charcoal and a calm mid-blue accent. Flat vector clarity, calm and precise.
content.the_dutyThe duty is moving a product that damages easily, while keeping it intact. Many process fluids are shear-sensitive: emulsions and creams, which separate; yoghurt and other structured foods; crystals and sugar suspensions, which fracture; flocculated slurries in water treatment, where the flocs must survive; latex; and fruit preparations with whole pieces. Shear rises with speed and with tight clearances — the faster fluid is forced through a small gap, the more stress it feels. A high-speed centrifugal pump, whose impeller can spin at 2,900 rpm, is the classic way to wreck a shear-sensitive product: the fluid is accelerated hard and forced through fine clearances. Once the structure is broken, you can't put it back. So the pump choice is part of the product spec, not just the plumbing.
content.selectionChoose a positive displacement pump and run it slowly. Positive displacement types move a fixed volume of fluid per revolution, so you get the flow you need at low rotational speed — and low speed is what keeps shear down. Rotary lobe pumps handle emulsions, creams and gentle food duties with a smooth, low-pulsation action. Progressing cavity pumps — a helical rotor in a rubber stator — carry flocculated slurries, fragile crystals and delicate solids very gently. Diaphragm and peristaltic pumps also handle shear-sensitive media, with no fast-moving clearances. Avoid high-speed centrifugal pumps for anything fragile. Where a centrifugal is unavoidable, a large, slow impeller shears less than a small, fast one. Size for low speed, large flow passages and gentle filling, then match materials to the medium. Tell Channel Pumps what you're moving and why it's delicate, and we specify a low-shear pump.
content.key_featuresLook for a pump that moves fluid gently, not fast. Check for positive displacement action at low running speed, so you get flow without high impeller tip speeds. Check for large, open flow passages rather than tight clearances. Check for a smooth, low-pulsation delivery that doesn't hammer the product. And check the elastomers and metallurgy suit the medium. Rotary lobe, progressing cavity, diaphragm and peristaltic pumps all handle shear-sensitive media well. A high-speed centrifugal pump is the wrong tool for a fragile product.
content.lineupcontent.lineup.headingLow-shear pumps
content.relatedcontent.related.headingOther pumping duties
content.faq[]5 itemscontent.faq[0]content.faq[0].questionWhat is a low shear pump?
content.faq[0].answerA low shear pump moves fluid gently, so it doesn't break down delicate media. It runs at low speed with open flow passages, avoiding the high stress that damages emulsions, crystals and flocculated products.
content.faq[1]content.faq[1].questionWhat does shear do to a product?
content.faq[1].answerShear is the stress fluid feels when layers slide past each other at speed. Too much of it splits emulsions, crushes crystals and suspended solids, and breaks up flocs and fibres. The damage is usually permanent.
content.faq[2]content.faq[2].questionWhy avoid a centrifugal pump for shear-sensitive fluids?
content.faq[2].answerA centrifugal pump accelerates fluid with a fast impeller and forces it through fine clearances — both create high shear. For fragile products, that degrades quality. A slow positive displacement pump is gentler.
content.faq[3]content.faq[3].questionWhich pumps are low shear?
content.faq[3].answerPositive displacement types run slowly and handle delicate media well: rotary lobe, progressing cavity, diaphragm and peristaltic pumps. Rotary lobe suits creams and emulsions; progressing cavity suits flocculated slurries and fragile solids.
content.faq[4]content.faq[4].questionCan Channel Pumps recommend a low-shear pump for my product?
content.faq[4].answerYes. Tell us what you're moving and why it's shear-sensitive, plus your flow and pressure, and we specify a low-shear pump — usually positive displacement — sized to handle it gently.