A lobe pump (also called a rotary lobe pump) is a type of positive-displacement pump that uses two or more rotating lobes inside a casing to move fluid. The lobes trap liquid in pockets and carry it from inlet to outlet without contact between the lobes themselves. This design results in smooth, constant flow and gentle handling of liquids — even viscous or solids-laden ones.
📌 Typical Specifications of Lobe Pumps
(Actual specs vary by manufacturer and model)
🔹 Operating Principle Positive displacement with rotating lobes — flow proportional to speed.
🔹 Flow Rates • Up to ~100–115 m³/h (industrial sanitary models) • Consumer/medium-size units: 10,000–65,000 LPH range possible depending on inlet size and RPM
🔹 Pressure / Head • Up to ~15 bar (220 psi) for many sanitary designs • Some heavy-duty versions up to ~20–30 bar or ~1.2 MPa (~174 psi) in industrial variants
🔹 Speed & RPM • Typical maximum speeds around ~750–960 rpm for many sizes
🔹 Viscosity & Media • Can handle low to highly viscous fluids (from thin liquids up to ~100,000–1,000,000 cP depending on model) • Suitable for fluids with suspended solids and slurries without damaging product.
🔹 Temperature • Service up to ~150 °C typical (higher with special seals/materials) • Some industrial versions rated even higher based on construction.
🔹 Materials & Design • Wetted parts often in stainless steel (304/316L) for corrosion resistance and hygiene. • External gearbox, seals (mechanical or shaft packing), options for CIP/SIP cleaning for food/pharma.
🔹 Inlet/Outlet Sizes • From DN25 (~1″) up to DN100 (~4″) or larger on big units.)
🔹 Certs/Standards (sanitary units) • FDA, 3-A, EHEDG compliant designs available for hygienic industries.
