Product Overview

The ATOS PFE Series is a family of fixed-displacement hydraulic vane pumps designed for industrial hydraulic systems requiring reliable flow delivery, high volumetric efficiency and long operating life.

The requested configurations are:

• PFE-51090/1DU 32
• PFE-41085/1DV-20
• PFE-31044/5DU

ATOS officially classifies the PFE-31, PFE-41 and PFE-51 as fixed-displacement cartridge vane pumps with integral hydraulic balancing, designed for high volumetric efficiency, long service life and low noise. The PFE-32, PFE-42 and PFE-52 families are the higher-pressure, low-noise versions.

The PFE platform uses standardized SAE J744 mounting flanges, multiple port orientations and different shaft configurations, making it suitable for OEM replacement, machine refurbishment and industrial hydraulic service.

The complete ordering code must always be verified because displacement, shaft, rotation, port orientation and seal material are configuration-dependent.

Technical Specifications

PFE-51090/1DU 32

• Brand: ATOS
• Series: PFE-51
• Model: PFE-51090/1DU 32
• Pump Type: Fixed Displacement Hydraulic Vane Pump
• Construction: Cartridge design
• Displacement: 90.0 cm³/rev
• Maximum Working Pressure: 210 bar
• Minimum Speed: 800 rpm
• Maximum Speed: 2200 rpm
• Control: Fixed displacement
• Drive Shaft: 1 = standard cylindrical keyed shaft
• Rotation: D = clockwise, viewed from the shaft end
• Port Orientation: U
• Typical Flow at 1450 rpm / 7 bar: approximately 128 L/min
• Typical Flow at 1450 rpm / 140 bar: approximately 119 L/min
• Typical Power: approximately 45 kW
• Catalog Test Fluid: Mineral oil ISO VG 46 at 50 °C

The additional 32 suffix is retained as part of the supplied product identification, but its complete engineering meaning is not expanded in the publicly indexed ATOS product-page text; it should therefore be verified against the physical nameplate or ATOS configuration documentation rather than guessed.

PFE-41085/1DV-20

• Brand: ATOS
• Series: PFE-41
• Model: PFE-41085/1DV-20
• Pump Type: Fixed Displacement Hydraulic Vane Pump
• Construction: Cartridge design with integral hydraulic balancing
• Displacement: 85.3 cm³/rev
• Maximum Working Pressure: 210 bar
• Minimum Speed: 800 rpm
• Maximum Speed: 2000 rpm
• Control: Fixed displacement
• Drive Shaft: 1 = standard cylindrical keyed shaft
• Rotation: D = clockwise
• Port Orientation: V
• Typical Flow at 1450 rpm / 7 bar: approximately 124 L/min
• Typical Flow at 1450 rpm / 140 bar: approximately 118 L/min
• Typical Power: approximately 43 kW
• Typical Test Condition: Mineral oil ISO VG 46 at 50 °C
• Standard Seal Material: NBR; /PE denotes FKM seal configuration

PFE-31044/5DU

• Brand: ATOS
• Series: PFE-31
• Model: PFE-31044/5DU
• Pump Type: Fixed Displacement Hydraulic Vane Pump
• Construction: Cartridge design
• Displacement: 43.7 cm³/rev
• Maximum Working Pressure: 210 bar
• Minimum Speed: 800 rpm
• Maximum Speed: 2500 rpm
• Control: Fixed displacement
• Drive Shaft: 5 = splined shaft for applicable single/multiple pump configurations
• Rotation: D = clockwise
• Port Orientation: U
• Typical Flow at 1450 rpm / 7 bar: approximately 63 L/min
• Typical Flow at 1450 rpm / 140 bar: approximately 58 L/min
• Typical Power: approximately 22 kW
• Approximate Weight: 9.0 kg
• Shaft: SAE 9-tooth splined shaft, DP 16/32
• Inlet Port: SAE 1-1/4 in flange
• Outlet Port: SAE 3/4 in flange

Engineering Note on Pressure Rating

ATOS’s A005 documentation specifies Maximum Working Pressure, not separate rated and peak pressure values for these PFE-31/41/51 configurations.

Therefore, this product page should state:

• PFE-51090: 210 bar maximum working pressure
• PFE-41085: 210 bar maximum working pressure
• PFE-31044: 210 bar maximum working pressure

A separate “peak pressure” figure should not be invented or inferred from another PFE family.

Key Technical Advantages

1. Integral Hydraulic Balancing

ATOS incorporates integral hydraulic balancing into the PFE cartridge assembly. This design supports stable running clearances, high volumetric efficiency and long service life.

From an engineering perspective, balanced pressure loading helps manage:

• Rotor axial loading
• Internal leakage
• Running clearances
• Volumetric efficiency

2. Cartridge Construction

The replaceable pumping cartridge simplifies service and can reduce downtime compared with more integrated pump architectures. ATOS explicitly identifies simplified maintenance and easy cartridge replacement as key PFE features.

This is particularly useful for:

• Industrial maintenance
• Emergency replacement
• Machine refurbishment
• Aftermarket service

3. High Volumetric Efficiency

For the PFE-51090, the theoretical displacement flow at 1450 rpm is:

90.0 × 1450 / 1000 = 130.5 L/min

ATOS catalog data indicates approximately 128 L/min at 1450 rpm and 7 bar, demonstrating the high-flow capability of the design under the specified test condition.

4. Low-Noise Operation

ATOS describes PFE-*1 pumps as low-noise vane pumps, while the PFE-*2 families are explicitly categorized as high-pressure, low-noise products.

This makes the platform attractive for machine tools, production machinery and indoor hydraulic power units where acoustic performance matters.

5. SAE J744 Mounting Standard

The PFE platform uses SAE J744 mounting flanges and offers multiple inlet/outlet orientation options.

This simplifies installation and can reduce modifications during pump replacement.

6. Flexible Configuration Architecture

ATOS’s ordering system distinguishes:

• Pump size
• Displacement
• Drive shaft
• Rotation
• Port orientation
• Seal material
• Through-shaft arrangement

For example:

• 1 = standard cylindrical keyed shaft
• 5 = splined shaft
• D = clockwise rotation
• S = counterclockwise rotation
• T/U/V/W = port orientation options
• PE = FKM seal option

This makes complete-code verification essential for genuine interchangeability.

Application Areas

Typical applications include:

• Machine Tools
• Hydraulic Power Units
• Metal Forming Machinery
• Industrial Presses
• Plastic Processing Machinery
• Material Handling Equipment
• Steel Processing Machinery
• Industrial Automation Systems
• Hydraulic Test Equipment
• Centralized Industrial Hydraulic Systems

The PFE-31044/5DU is suited to medium-flow applications, while the larger PFE-41085/1DV-20 and PFE-51090/1DU 32 are suitable for higher-flow industrial hydraulic systems.

Expert Maintenance Tips

Control the Inlet Pressure

ATOS specifies recommended inlet pressure of:

• −0.15 to +1.5 bar for speeds up to 1800 rpm
• 0 to +1.5 bar for speeds above 1800 rpm

This becomes particularly important when operating the higher-speed configurations.

Respect Model-Specific Speed Limits

The maximum speeds are not identical:

• PFE-51090: 2200 rpm
• PFE-41085: 2000 rpm
• PFE-31044: 2500 rpm

Do not apply the highest family speed to every PFE model.

Maintain the Correct Fluid Condition

ATOS catalog performance data is based on ISO VG 46 mineral oil at 50 °C. Significant changes in viscosity, temperature or fluid type require a fresh engineering check of operating limits.

Verify Rotation and Port Orientation

The D/S rotation designation and T/U/V/W port orientation are part of the actual pump configuration. A replacement pump should therefore be checked against the original nameplate before installation.

Inspect the Cartridge When Performance Declines

When flow decreases or noise and heat rise, inspect the:

• Rotor
• Vanes
• Balanced plates
• Internal running clearances

rather than replacing only the shaft seal. The cartridge concept is specifically intended to simplify pump servicing.