GR40 Parker SMT16B 150L Three Screw Pump 40 Bar

Product Overview

The GR40 SMT16B-150L-S1 RF2V is a Parker GR Series three-screw pump configured for dry installation and 40 bar-class operation. It is designed for smooth, low-pulsation fluid transfer in lubrication, cooling, filtration and power-hydraulic systems.

According to the Parker GR Screw Pump catalogue, the SMT16B belongs to the 40 bar dry screw pump family. The GR40 frame size is available with nominal flow ratings of 80, 100, 125 and 150 L/min, with the 150L configuration rated at 2950 rpm. The series supports a shaft speed range of 500–3600 rpm, with an outlet pressure rating of 40 bar continuous and 50 bar intermittent.

The GR pump uses one main screw and two secondary screws. Parker describes the design as having only three moving parts, with the secondary screws hydraulically driven by the pumped fluid. The rolling interaction between the screws helps reduce mechanical noise and vibration while maintaining smooth axial flow with low pulsation.

For industrial replacement projects, this configuration is suitable for engineered interchangeability matching against an existing GR40/SMT16B installation. Our replacement units can be matched according to shaft arrangement, mounting interface, rotation, seal configuration and relief-valve configuration, followed by 100% simulated operating-condition testing before shipment.

Technical Specifications

• Model: GR40 SMT16B-150L-S1 RF2V
• Series: Parker GR Screw Pump
• Pump Type: SMT16B dry three-screw pump
• Frame Size: GR40
• Nominal Flow: 150 L/min at 2950 rpm
• Continuous Outlet Pressure: 40 bar
• Intermittent Outlet Pressure: 50 bar
• Permitted Shaft Speed: 500–3600 rpm
• Reference Speed: 2950 rpm
• Inlet Pressure: −0.7 to 3 bar
• Viscosity Option: S1, approximately 100–250 cSt
• Shaft Seal: V = FKM
• Internal Relief Valve: RF2 = fixed 10 bar
• Standard Rotation: Clockwise when viewed from the shaft end; anticlockwise available with SX configuration.
• Standard Housing: Extruded aluminium alloy
• Standard Main Screw: Steel
• Standard Secondary Screws: Cast iron
• Noise Level: Approximately 52–68 dB(A) at 2950 rpm for the GR range
• Approximate Standard GR40 SMT16B Weight: 7 kg
• Displacement: Parker specifies this configuration by nominal flow rather than a separate catalogue displacement value. The equivalent theoretical displacement calculated from 150 L/min at 2950 rpm is approximately 50.85 cm³/rev; this is a calculated engineering value, not a separately published Parker rating.

Key Technical Advantages

1. Three-Screw Axial Flow Architecture

The three-screw arrangement produces continuous axial flow with low pulsation. This makes the GR40 well suited to lubrication and circulation systems where stable delivery is more important than the high-pressure characteristics of a piston pump.

2. Low Noise and Reduced Vibration

The secondary screws are hydraulically driven by the pumped fluid, while the screw set operates with rolling interaction. This configuration minimizes mechanical impact and contributes to the low-noise characteristics of the GR series.

3. S1 High-Viscosity Configuration

The S1 code specifically identifies Parker’s high-viscosity option for approximately 100–250 cSt service. This configuration is relevant to lubrication oils and other relatively viscous fluids where standard low-viscosity selection may not be optimal. Parker notes that high-viscosity options can reduce pump efficiency.

4. FKM Shaft Seal

The V suffix identifies an FKM shaft seal. This provides a different sealing material option from the standard NBR configuration and can be advantageous in selected elevated-temperature or chemically demanding fluid applications, subject to fluid compatibility verification.

5. Stable 40 Bar-Class Operation

The SMT16B family is rated for 40 bar continuous outlet pressure and 50 bar intermittent pressure. The GR40 should therefore be selected as a medium-pressure fluid circulation and power-hydraulic pump rather than treated as a high-pressure piston-pump equivalent.

6. Direct Motor Integration

The Parker GR platform supports ISO 3019/2 and IEC-standard motor connection arrangements. Appropriate shaft and flange configurations can reduce coupling complexity, installation space and assembly time in compact power units.

Application Areas

Typical applications for the GR40 SMT16B-150L-S1 RF2V include:

• Industrial lubrication systems
• Gearbox and gear-train lubrication
• Diesel engine lubrication
• Compressor lubrication
• Turbine lubrication and circulation
• Generator seal-oil and lubrication systems
• Machine-tool lubrication
• Power-hydraulic circuits
• Hydraulic test benches
• Cooling and filtration systems
• Oil and gas auxiliary fluid systems
• Marine and offshore equipment
• Petrochemical fluid circulation systems

Parker specifically lists lubrication, seal oil, power hydraulics, cooling, machine tools, turbines, compressors, gearboxes, marine equipment and petrochemical applications within the GR pump application range.

Expert Maintenance Tips

1. Protect the suction side.
Maintain proper inlet conditions and minimize suction-line pressure losses. Parker specifies an inlet pressure range of approximately −0.7 to 3 bar.

2. Match viscosity, speed and temperature.
For the S1 version, confirm actual operating viscosity rather than relying only on nominal oil grade. High-viscosity fluids can increase starting torque and reduce efficiency, particularly at low temperatures.

3. Verify shaft rotation before commissioning.
The standard Parker configuration rotates clockwise when viewed from the shaft end. Confirm motor rotation before applying full operating load.

4. Treat RF2 as pump protection, not the system’s primary pressure-control valve.
The RF2 designation corresponds to a fixed 10 bar internal relief valve. It should not automatically be interpreted as the main pressure-control device for the complete hydraulic circuit.

5. Maintain high fluid cleanliness.
Parker specifies a recommended filtration performance of β25 > 75 and gives a basic contamination reference of NAS 1638 Class 10 or ISO 4406 19/16. Filter differential pressure should be monitored as part of preventive maintenance.

6. Verify the complete configuration code before replacement.
For a true drop-in replacement, do not match only “GR40” or “150L”. Confirm SMT16B, S1, V, RF2, shaft configuration, flange configuration and rotation direction against the existing pump nameplate and installation drawing. The Parker ordering code explicitly uses these fields to define the final pump configuration.