A three-screw (3G) positive-displacement rotary pump engineered for continuous, low-pulsation transfer of lubricating and non-corrosive oils. Fluid is conveyed by the axial movement created between the driven and driving screws and the pump bushing, which forms dynamic seal chambers that move liquid from inlet to outlet in a stable, step-wise manner. The design delivers smooth flow, low noise and long service life with minimal vibration and starting torque.
Key specifications
- Flow range: 0.2 – 590 m3/h
- Maximum working pressure: up to 100 bar
- Maximum operating temperature: up to 150 °C
- Suitable fluid viscosity: approx. 1.2 – 100 °E (≈ 3 – 760 cSt). High-viscosity fluids can be handled when heated to reduce viscosity
- Pump type: three-screw / three-spindle positive-displacement rotary pump
Principal features and available configurations
- Simple, robust internal construction with three intermeshing screws and a bushing that creates dynamic sealing chambers
- Low friction between screws and bushing; oil film lubrication results in long service life
- Very low pressure pulsation and smooth axial flow for stable delivery and low noise
- High suction capability for effective priming and lift
- Shaft sealing: mechanical seals or packing seals selectable according to conveyed medium
- Small-flow units (typically 0.2–6.5 m3/h) are commonly supplied as a single horizontal assembly; medium and large flow designs may use removable bushings or double-suction construction for higher capacities
- Safety valve option for medium-flow models to protect pump, motor and piping by returning excess pressure to the inlet
- Marine AC motor drive available for marine installations
Applications
Ideal for metered transfer, circulation and loading of lubricating oils and similar non-corrosive, particle-free liquids in industrial, marine and process environments. Common uses include oil transfer, lubrication systems, fuel supply and hydraulic oil circulation.
Selection notes
When specifying a 3G screw pump, provide required flow and pressure, operating temperature, fluid viscosity (or sample), desired shaft seal type, and any required motor or mounting configuration. For high-viscosity fluids, specify heating or jacketed options to ensure the fluid is within the pump's recommended viscosity range.
Product Details
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