Product Overview
The GR20, GR25, GR32, GR40, GR45, GR55, GR60, GR70, and GR80 series, along with specific models such as GR40 SMT16B 100L, originate from the Italian Settima Meccanica GR Series three-screw pump technology platform. Settima is a globally renowned manufacturer of three-screw pumps, and its GR Series products are known for ultra-low noise, pulsation-free output, and long service life, making them ideal for a wide range of low-pressure lubrication, cooling, and fluid transfer applications.
This series features three-screw pump construction, with precision meshing between the main screw and two idler screws, delivering smooth axial fluid flow that fundamentally eliminates pressure pulsation and oil trapping. The SMT16B is Settima’s short-screw compact series, specifically designed for space-constrained applications. GR series pumps are available with internal or external safety relief valves, and the pump body and screw design eliminate any axial loads.
Key Interchangeability Advantage: Our GR series three-screw pumps are manufactured to strict Italian Settima original design specifications, ensuring 100% direct interchangeability with original units. All mounting interfaces, flange dimensions (compliant with SAE-A / SAE-B / European BKT standards), shaft configurations, and port positions are identical to the original product—no modifications required. Every pump undergoes 100% factory performance testing under simulated operating conditions, guaranteeing plug-and-play reliability with zero performance deviation.
Model Code Breakdown (based on Settima GR SMT16B Series designation rules):
GR = Series: Three-Screw Pump
20 / 25 / 32 / 40 / 45 / 55 / 60 / 70 / 80 = Size code (corresponding to different displacement/flow ratings)
SMT16B = Body type: Short-screw compact type for low-pressure applications
100L = Rated flow: 100 L/min (@ rated speed)
RF2 / LS2 / AC28-B5 etc. = Configuration codes for mounting flange, shaft type, ports
Technical Specifications
GR Series – General Specifications
Product Series: GR Series Three-Screw Pump
Brand: Settima Meccanica (Italy)
Pump Type: Three-screw pump, short-screw compact (SMT16B)
Maximum Continuous Operating Pressure: 40 bar
Peak Pressure: 50 bar
Speed Range: 500 – 3600 rpm
Flow Range: 0 – 800 L/min (@ 1500 rpm)
Media Viscosity Range: 0.2 – 100,000 cSt
Operating Temperature Range: -50℃ to +300℃
Inlet Pressure: -0.7 to 3 bar abs
Noise Level: 52 – 68 dB(A) (@ 2950 rpm)
Housing Material: Aluminum alloy (cast iron optional)
Rotor Material: Special alloy steel
Seal Material: NBR / FPM / EPDM
Direction of Rotation: Clockwise (viewed from shaft end)
Mounting Position: Any position
Mounting Flange Standards: SAE-A / SAE-B / European BKT
Port Connection Standards: GAS thread or SAE 3000/6000 weld flanges
GR20 SMT16B Series
GR25 SMT16B Series
GR32 SMT16B Series
GR40 SMT16B Series (including GR40 SMT16B 100L)
Series: GR40 SMT16B
Flow Options: 100 / 125 / 150 L/min
GR40 SMT16B 100L Rated Flow: 100 L/min (@ 3000 rpm)
GR40 SMT16B 100L Flow (@ 1500 rpm): 50 L/min
Pressure: 40 bar (continuous) / 50 bar (peak)
Weight: Approx. 10.8 kg
GR45 SMT16B Series
GR55 SMT16B Series
GR60 SMT16B Series
GR70 SMT16B Series
GR80 SMT16B Series
Key Technical Advantages
1. Precision Three-Screw Meshing Design for Zero Pulsation Output
The GR Series features precision meshing between the main screw and two idler screws, delivering smooth axial fluid flow. The smooth meshing tooth surfaces of the rotors enable pulsation-free fluid flow, fundamentally eliminating the root cause of noise—pressure pulsation—with no oil trapping. This characteristic makes it the ideal choice for lubrication and cooling systems with stringent flow stability requirements.
2. Ultra-Low Noise Operation (52 – 68 dB(A))
Through advanced screw geometry design and high-precision machining processes, the GR Series three-screw pumps achieve extremely low noise levels. The SMT16B pump delivers acoustic emissions of only 52 – 68 dB(A) at 2950 rpm. The low-noise characteristic makes it particularly suitable for indoor equipment, office environments, hospitals, and laboratories with strict noise requirements.
3. Axial Load-Free Design for Extended Service Life
The pump body and screw design eliminate any axial loads. Functional pressure develops tolerance between the balancing piston of the main screw and the surrounding body, creating a balancing hydrodynamic force on the screws while lubricating and cooling the sealing components. The torque needed to move the lateral screws is transmitted hydraulically by the pumped fluid—the screws rotate with no possibility of mechanical wearing. This unique design ensures exceptionally long service life and high reliability.
4. Extremely Wide Media and Temperature Adaptability
The GR Series three-screw pumps can handle an exceptionally wide viscosity range, from 0.2 cSt low-viscosity fluids to 100,000 cSt high-viscosity media. The operating temperature range covers -50℃ to +300℃. This characteristic makes them widely applicable to mineral oils, synthetic oils, lubricating oils, fuel oils, thermal oils, and many other media in transfer and circulation systems.
5. Compact Lightweight Design Saves Installation Space
The SMT16B features shorter screws compared to standard SMT pumps, making it ideal for space-constrained applications. The aluminum housing delivers significant weight reduction while maintaining structural integrity. Pumps are available with internal or external safety relief valves, further simplifying system integration.
Application Areas
Equipment Forced Lubrication Systems: Lubricating oil supply for gearboxes, compressors, fans, generator sets, wind turbine gearboxes
Cooling and Filtration Systems: Large cooling circuits, filtration system circulation pumps, industrial chiller units
Wind Power: Wind turbine gearbox lubrication and cooling systems
Marine and Offshore Engineering: Marine gearbox lubrication, fuel transfer pumps
Metallurgy and Mining: Coal mill oil supply pumps, rolling mill lubrication systems
Power Generation and Power Plants: Turbine lubrication systems, power plant auxiliary oil pumps
Plastics and Rubber Industry: Injection molding machine hydraulic systems
Machine Tools and Industrial Equipment: Machine tool lubrication, low-pressure hydraulic power units
Elevators and Lifting Equipment: Hydraulic elevators, lift platforms
Expert Maintenance Tips
1. Model Confirmation and Selection
Complete GR series three-screw pump model should include: Series (GR) + Size (20–80) + Body Type (SMT16B) + Flow (e.g., 100L) + Configuration Code (e.g., RF2, LS2, AC28-B5, etc.) .
SMT16B is the short-screw compact series with maximum continuous pressure 40 bar and peak 50 bar. For higher pressure requirements, select other Settima high-pressure series (e.g., GR33 continuous pressure up to 265 bar).
Verify operating pressure, flow requirements, and installation space during selection.
2. Rotation Direction Confirmation
3. First Start-Up & Media Priming
Prime the pump housing with clean media before first start-up; ensure suction line is fully filled—never run dry.
Inlet pressure must be maintained within -0.7 to 3 bar abs.
Maintain operating temperature within -50℃ to +300℃.
Speed range: 500 – 3600 rpm.
4. Filtration Requirements
Recommended inlet filtration: 100 μm; pressure port filtration: 10 – 25 μm.
Three-screw pumps have specific fluid cleanliness requirements—regularly monitor fluid quality to prevent contaminants from accelerating screw and bushing wear.
5. Operating Monitoring
Three-screw pumps are known for pulsation-free, low-noise operation—if abnormal noise or pressure fluctuation occurs, first check suction lines for leakage or blockage.
Continuous operating pressure must not exceed 40 bar; peak pressure must not exceed 50 bar (instantaneous).
Regularly check torque on pump and piping connection bolts to prevent loosening from vibration.
