GR32SMT16B35LRF3 Settima Three Screw Pump 35 L/min 40 bar

Product Overview

The GR32SMT16B35LRF3 is a three-screw pump from Settima Meccanica’s SMT16B series, designed for low-pressure industrial applications up to 40 bar. Featuring a triple-screw (three-spindle) design, this pump delivers exceptional low-noise performance, high reliability, and extended service life — making it the ideal choice for hydraulic systems requiring quiet operation and consistent output.

This model offers direct interchangeability with Parker GR series pumps of equivalent specifications. All mounting dimensions and port interfaces are fully compatible, enabling seamless replacement without system modifications. Settima Meccanica, a leading European manufacturer since 1978, holds DIN/ISO 9001 certification.

Model Code Breakdown:

• GR32 — Pump group size

• SMT16B — Series code (SMT = dry installation, 16B = body size)

• 35L — Flow rating (35 L/min @ 3000 rpm)

• RF3 — Internal relief valve, set at 15 bar

Technical Specifications 

• Model: GR32SMT16B35LRF3

• Brand: Settima Meccanica (Italy)

• Pump Type: Three-screw pump

• Geometric Displacement: 11.8 cm³/rev

• Nominal Flow Rate: 35 L/min @ 3000 rpm

• Rated Pressure: 40 bar

• Intermittent Pressure: Up to 100 bar

• Internal Relief Valve (RF3): Set at 15 bar

• Minimum Speed: 500 rpm

• Maximum Speed: 3,600 rpm

• Viscosity Range: 2 to 10,000 cSt

• Fluid Temperature Range: -20°C to +180°C

• Ambient Temperature Range: -20°C to +60°C

• Noise Level: 52 to 68 dB(A) @ 2950 rpm

• Pump Body Material: Extruded aluminum alloy

• Screw Material: Hardened steel (primary) / cast iron (secondary)

• Seal Material: NBR (standard), FKM/EPDM optional

• Mounting Type: Dry (SMT)

• Rotation Direction: Clockwise (standard), counter-clockwise available on request

• Flange Standard: ISO 3019/2

• Port Standard: SAE 3000 / BSPP

• Filtration Requirement: NAS 1638 Class 8 or ISO DIS 4406 17/14, recommended β25 ≥ 75

Key Technical Advantages

1. Superior Low-Noise Performance

The triple-screw helical meshing design delivers approximately 15 dB(A) lower noise compared to traditional external gear pumps. With noise emissions of just 52-68 dB(A) at 2950 rpm, this pump is ideal for noise-sensitive applications including elevator hydraulics, hospital equipment, and laboratory systems.

2. Wide Viscosity and Media Compatibility

Exceptional viscosity range (2 to 10,000 cSt) accommodates everything from low-viscosity hydraulic fluids to high-viscosity lubricating oils. Compatible with mineral oils, HFA (oil-water, ≥5% oil), HFB (water-oil emulsion, ≥40%), HFC (water-glycol), HFDR (phosphate ester), synthetic fluids (MIL-H, SKYDROL), and fuels (MGO, MDO, HFO).

3. High Volumetric Efficiency & Stable Output

The three-screw design ensures continuous, pulse-free fluid delivery with minimal flow pulsation. High efficiency is maintained even at low speeds (down to 500 rpm), making it suitable for applications requiring precise flow control.

4. Exceptional Reliability & Service Life

Primary screws are manufactured from case-hardened steel with specialized surface treatment for enhanced wear resistance. The extruded aluminum alloy body provides excellent heat dissipation. The SMT16B series holds ATEX certification for operation in potentially explosive atmospheres.

Application Areas

• Elevator Hydraulic Systems — Low noise, long-life operation

• Gearbox & Bearing Lubrication — Consistent oil delivery

• Cooling Circulation Systems — High-flow, low-pressure coolant transfer

• Hydraulic Test Benches — Stable pressure and flow output

• Industrial Burner Fuel Supply — Fuel oil transfer

• Marine Engineering — Bilge and lubrication systems

• Filtration Equipment — Low-pressure filtration circuits

• Lubrication & Greasing Systems — Centralized lubrication

Expert Maintenance Tips

1. Installation Guidelines

• Ensure no axial or radial loads are applied to the pump shaft

• Standard rotation is clockwise (viewed from shaft end); confirm if counter-clockwise is required

• Inlet pressure range: -0.7 bar minimum to 3 bar maximum

2. Filtration & Cleanliness

• System filtration must meet NAS 1638 Class 8 or ISO 4406 17/14 standards

• Recommended filtration: β25 ≥ 75

• Thoroughly flush all piping before initial start-up

3. Start-Up & Operation

• Prime the pump by filling the housing with fluid before initial start-up

• Avoid prolonged operation below 500 rpm

• Do not exceed 180°C fluid temperature

4. Maintenance Schedule

• Periodically verify the RF3 relief valve (set at 15 bar) is functioning correctly

• Replace seals every 2,000 operating hours or per OEM recommendations

• Before restarting after extended shutdown, check shaft flexibility and seal condition