GR20-SMT16B-23L | Settima Screw Pump 23L/min 50bar

Product Overview

The GR Series Three-Screw Pumps are the core product of the SETTIMA SMT16B series. Founded in 1978, Settima Meccanica initially focused on producing high-technology three-screw pumps for the elevator industry to reduce noise and vibration in hydraulic circuits. Over more than four decades, Settima has become a globally recognized manufacturer of low-noise screw pumps, with DIN/ISO 9001 certification and ATEX certification for the SMT16B types.

The SMT16B series is an industrial low-pressure three-screw pump range (continuous pressure up to 40-50 bar). Developed based on the mass production experience of elevator pumps, it is a reliable and low-noise industrial solution. SMT16B pumps are available in dry installation (SMT) or submersible installation (SMIT) variants. Compared to standard SMT pumps, SMT16B features shorter screws, making it ideal for space-restricted applications.

GR series three-screw pumps are positive displacement rotary pumps with axial flow design and only three moving parts—one driving screw and two driven screws. The idler screws are hydraulically rotated by the pumped fluid. There is only a rolling action between the driving screw and idler screws, which eliminates noise and vibration.

GR20-SMT16B-23L model code breakdown:

• GR20: GR series, size group 20

• SMT16B: SMT16B series – dry-installation industrial pump with shorter screws for space-restricted applications

• 23L: Nominal flow of 23 L/min @ 3000 rpm

GR25-SMT16B-30L model code breakdown:

• GR25: GR series, size group 25

• SMT16B: SMT16B series

• 30L: Nominal flow of 30 L/min @ 3000 rpm

GR32-SMT16B-35L-RF3 model code breakdown:

• GR32: GR series, size group 32

• SMT16B: SMT16B series

• 35L: Nominal flow of 35 L/min @ 3000 rpm

• RF3: Internal pressure relief valve (permanently set to 5, 10 or 15 bar)

GR40-SMT16B-125L model code breakdown:

• GR40: GR series, size group 40

• SMT16B: SMT16B series

• 125L: Nominal flow of 125 L/min @ 2950 rpm

We specialize in the R&D and manufacturing of high-pressure pumps, motors, and valve groups. All GR series SMT16B models offer 100% direct interchangeability with original Settima pumps of the same model—no modification required. Every unit undergoes 100% simulated load testing before shipment, ensuring performance validation under real-world operating conditions.

Technical Specifications 

SMT16B Series General Specifications:

• Brand Series: SETTIMA GR Series / SMT16B Series

• Pump Type: Three-screw pump

• Mounting: Dry installation (SMT) / Submersible installation (SMIT)

• Continuous Operating Pressure: 40 – 50 bar

• Peak Pressure: 80 bar

• Fluid Media: Mineral hydraulic oil, gear oil, lubricating oil

• Viscosity Range: Up to 1000 cSt

• Noise Level: Extremely low noise operation – Settima Continuum® system delivers just 68 dB

• Rotation Direction: Clockwise viewed from shaft end (standard), counter-clockwise available on request

• Mounting Flange: ISO 3019/2 compliant

• Line Connections: SAE 3000 PSI and BSP threads

• Installation Position: Any orientation; fully or partially submersible in oil

• Seal Materials: NBR (standard), Viton (FKM), PTFE, EPDM

• Safety Valve Options: Internal relief valve (RF1/RF2/RF3) or external adjustable relief valve (RP)

GR20-SMT16B-23L Specifications:

• Model: GR20-SMT16B-23L

• Size Group: GR20

• Nominal Flow (@ 3000 rpm): 23 L/min

• Continuous Operating Pressure (mineral oil): 50 bar

• Peak Pressure: 80 bar

• Flange Specification: AC14 B14 (standard)

• Suction Port: 1/2″ BSP

• Housing Material: Aluminum alloy (standard) / Cast iron / Stainless steel

• Screw Treatment: S1-S4 (special processing for different viscosity ranges)

GR25-SMT16B-30L Specifications:

• Model: GR25-SMT16B-30L

• Size Group: GR25

• Nominal Flow (@ 3000 rpm): 30 L/min

• Flow (@ 1500 rpm): Approx. 80 L/min (external configuration)

• Continuous Operating Pressure: 40 bar

• Shaft: ISO 3019/2 compliant

• Rotation Direction: Clockwise

• Mounting: Submersible

• Port Connection: BSPP threads (GAS)

• Country of Origin: Italy

GR32-SMT16B-35L-RF3 Specifications:

• Model: GR32-SMT16B-35L-RF3

• Size Group: GR32

• Nominal Flow (@ 3000 rpm): 35 L/min

• Flow (@ 1500 rpm): Approx. 130 L/min (external configuration)

• Continuous Operating Pressure: 40 bar

• Mounting Flange: B5 flange

• Safety Valve: Internal RF3 relief valve (permanently set)

• Rotation Direction: Clockwise

• Viscosity Range: Up to 250-500 cSt

GR40-SMT16B-125L Specifications:

• Model: GR40-SMT16B-125L

• Size Group: GR40

• Nominal Flow (@ 2950 rpm): 125 L/min

• Continuous Operating Pressure: 40 bar

• Maximum Viscosity: 100 cSt

• Mounting Flange: IEC D90 B5

• Shaft: Hollow shaft, 24 mm

• Rotation Direction: Clockwise

• Housing Material: Aluminum alloy

• Seal Material: NBR

• Safety Valve: No internal relief valve

Key Technical Advantages

1. Ultra-Low Noise & Pulse-Free Operation via Three-Screw Principle

Settima three-screw pumps utilize three specially profiled helical screws that mesh to create continuous, pulse-free media delivery. There is only a rolling action between the driving screw and idler screws, which eliminates noise and vibration. The Settima Continuum® system delivers just 68 dB while providing power—up to 15 dB(A) quieter than standard gear and vane pumps.

2. Extremely Low Pressure Pulsation – Ensures Smooth System Operation

The special helical screw design ensures continuous fluid delivery with minimal pressure pulsation. Settima screw pumps are renowned for being pulse-free and noise-free. The geometry and high-precision machining of the three screws form sealed chambers that smoothly transport fluid axially from inlet to outlet.

3. Exceptional Reliability with Minimal Maintenance Requirements

Three-screw pumps have very few moving parts—only three screws—significantly reducing the probability of mechanical failure. The SMT16B series requires virtually no maintenance, substantially reducing total lifecycle operating costs.

4. Broad Media Compatibility with Installation Flexibility

The SMT16B series can handle media ranging from mineral hydraulic oils to high-viscosity lubricating oils, with viscosity up to 1000 cSt. Pumps can be installed in any orientation (dry or submersible). ISO 3019/2 standard flanges and SAE/BSP port options ensure compatibility with a wide range of industrial equipment.

5. Compact Design – Ideal for Space-Restricted Applications

Compared to standard SMT pumps, SMT16B features shorter screws, specifically designed for space-restricted applications. The compact design allows easy installation in the limited space of various industrial equipment.

6. Integrated Relief Valve Options (RF1/RF2/RF3)

SMT16B pumps can be equipped with internal pressure relief valves (RF1, RF2, RF3), permanently set to 5, 10 or 15 bar. GR32-SMT16B-35L-RF3 features the RF3 internal relief valve, providing overpressure protection for the system.

Application Areas

• Lube Oil Stations—centralized lubrication and cooling for industrial equipment

• Gearbox Lubrication Systems—forced lubrication for various industrial gearboxes

• Turbine Lubrication Systems—bearing lubrication for steam and gas turbines

• Compressors & Rotating Equipment—lubrication and cooling systems

• Elevators & Lifts—hydraulic systems (Settima’s founding application)

• Cooling Systems—industrial equipment cooling circulation

• Test Benches—hydraulic testing systems

• Oil Burners—oil burner fuel supply systems

• Shipbuilding—marine hydraulic and lubrication systems

• Power Generation—lubrication systems for various power generation equipment

Expert Maintenance Tips

Model Code Verification (verify each element):

SMT16B series model codes contain critical information. Before selection and installation, confirm the following:

• GR: Product series identifier.

• Numbers (20/25/32/40, etc.) : Size group.

• SMT16B: SMT16B series – dry-installation industrial pump with shorter screws for space-restricted applications.

• Flow code (e.g., 23L, 30L, 35L, 125L, etc.) : Nominal flow (L/min @ 3000 rpm).

• AC code (e.g., AC14, AC19, AC24, etc.) : Flange type and motor mounting specification.

• B5 / B14: Flange mounting type.

• RF1 / RF2 / RF3: Internal relief valve configuration.

• S1/S2/S3/S4: Special screw processing – for different viscosity ranges.

Verify Rotation Direction:

Standard GR series rotates clockwise when viewed from the shaft end. Before installation, confirm that the drive motor rotation matches the pump’s rotation requirement. Counter-clockwise rotation must be specified at the time of ordering, but involves considerable additional costs and longer delivery times. Incorrect rotation will prevent the pump from delivering media properly.

Suction Line and Inlet Pressure Requirements:

GR series screw pumps offer excellent self-priming capability. Ensure the suction line is properly sealed with no air leaks, and select suction line diameter appropriately based on flow rate to avoid cavitation. SMT16B pumps can be installed completely or partially submerged in oil.

Coupling Alignment and Installation Precautions:

Ensure that no axial or radial shaft loads are transmitted to the pump during installation. Use flexible couplings with concentricity within 0.05 mm. Mounting flanges conform to ISO 3019/2 standard. For AC series hollow shaft versions, pumps can be mounted directly onto standard motors.

First-Start Priming Procedure:

After new pump installation or system overhaul, ensure the pump cavity is filled with media before first start. Jog the pump at low speed until the pump body is fully filled with oil and air is purged, then gradually increase to rated speed. Three-screw pumps must never be operated dry—running without media will cause severe wear to screws and the pump housing.

Filtration System and Oil Cleanliness Management:

Regularly inspect return filter condition and replace hydraulic oil and filters per equipment manufacturer recommended intervals. SMT16B pumps can be equipped with internal or external safety relief valves. Proper oil cleanliness management significantly extends pump service life.

Temperature and Viscosity Monitoring:

Maintain media temperature within the recommended range. SMT16B series offers special screw processing options for different viscosity ranges – S1 (100-250 cSt), S2 (250-500 cSt), S3 (500-800 cSt), S4 (800+ cSt). Excessive viscosity increases suction resistance, while low viscosity may reduce volumetric efficiency. Regularly inspect oil condition and replace if emulsified, degraded, or contaminated beyond acceptable limits.