1-1B Series underflow pump/screw pump/rotary pump

A single-screw (eccentric screw) underflow / rotary pump designed for reliable transfer of viscous, corrosive and solids-laden liquids in industrial applications. The pump’s rotor (eccentric helicoid screw) works inside a double-line helicoid stator to form successive sealed cavities; as the rotor rotates and rolls inside the stator the liquid is carried forward one screw pitch per revolution, producing continuous, low-pulsation flow and stable discharge pressure.

Key features

• Positive-displacement single-screw design for continuous, uniform flow and stable pressure
• Handles viscous media and suspensions containing solids (including food slurries, solutions and rubber fragments)
• Wet parts manufactured from high-grade stainless acid-proof steel; shaft material: 2Cr13
• Stator (bush) made from nontoxic rubber with no peculiar odor
• Rated working temperature up to 100 °C and suitable for media with high viscosity (specified up to 10000 Pa·s)
• Simple mechanical structure, easy maintenance and safe, reliable operation

Typical industrial applications

• Food processing (transfer of foodstuff slurries and viscous food solutions)
• Chemical and pharmaceutical transfer of corrosive liquids and suspensions
• Metallurgy and construction for abrasive or solids-containing fluids
• Any process requiring sanitary or corrosion-resistant transfer with low shear and gentle handling

Advantages for B2B buyers

• Robust construction for continuous duty and long service life
• Gentle pumping action reduces product damage (suitable for shear-sensitive media)
• Low maintenance: straightforward rotor/stator replacement and routine servicing
• Versatile across sectors—food, chemical, pharma, metallurgy, construction

Notes for specification and procurement

• Confirm required port size, shaft configuration, drive options, and sealing arrangement for your installation (the listed model is 1-1B2inch)
• Provide media characteristics (viscosity, solids concentration/size, temperature, corrosivity) when requesting precise sizing or material upgrades
• For hygienic/food applications, verify rubber compound and surface finish meet your regulatory or internal standards