Atos PFG Series Gear Pump PFG-114/D PFG-120/D PFG-128/D PFG-142/D

The industrial-grade Atos Compatible PFG Series High-Performance External Fixed Displacement Gear Hydraulic Pumps, manufactured by Chengyuan Hydraulic, are premium fluid power components developed for medium and high-pressure modern industrial systems. Representing global excellence in gear pump engineering, this series combines an ultra-compact mechanical envelope with high volumetric efficiency, exceptionally low operational noise, and outstanding structural fatigue resistance, making it standard equipment within machine tool, plastics machinery, and heavy industrial hydraulic stations worldwide.

This technical product copywriting profiles and replaces Atos’ core high-frequency reference configurations, including: PFG-114/D, PFG-120/D, PFG-128/D, and PFG-142/D (where “1” represents the standardized size 1 body framework, “14/20/28/42” designates the targeted displacement thresholds, and “/D” specifies the optimized clockwise rotational setup and shaft assembly). These pumps operate as critical power supply elements within central manifold integration blocks, filtration networks, and electro-hydraulic proportional/servo system pilot lines.

Chengyuan’s alternative gear pumps perfectly align with authentic Atos technical dimensions, mounting profiles (matching standard rectangular or SAE configurations), drive shafts (including straight keyed or involute splined variants), and port flange geometric positions. This layout guarantees 100% direct drop-in interchangeability for B2B commercial procurers, OEM machinery fabricators, and aftermarket equipment refurbishers. Maintenance personnel can execute straightforward field replacements onto existing motor mounts without altering complex high-pressure piping or custom coupling configurations.

High-pressure gear pumps must operate reliably through severe pressure fluctuations, continuous thermal stress up to 80°C, and heavy fluid shear forces. Lower-grade alternatives often suffer from shaft bearing failure, causing internal gear scuffing (“housing sweep”), rapid volumetric efficiency degradation, or shaft seal blowouts. To ensure continuous operation, 100% of Chengyuan’s PFG series replacement pumps undergo 100% strict dynamic load testing on digitized simulation benches. Verified under high pressure ranging from 210 to 230 bar, each unit is certified for hot flow capacity, shaft seal integrity, and mechanical volumetric efficiency before shipment.

Technical Specification

• Product Classification: High-Performance Fixed Displacement External Gear Hydraulic Pump

• Compatible Reference Platform Series: Atos PFG Series Size 1 Framework

• Geometric Displacement Specifications per Model Code:

  • Replacement Reference: PFG-114/D: Nominal displacement calibrated at approx. 1.4 cc/rev

  • Replacement Reference: PFG-120/D: Nominal displacement calibrated at approx. 2.0 cc/rev

  • Replacement Reference: PFG-128/D: Nominal displacement calibrated at approx. 2.8 cc/rev

  • Replacement Reference: PFG-142/D: Nominal displacement calibrated at approx. 4.2 cc/rev

• Maximum Continuous Operating Pressure: Rated up to 210 bar to 230 bar (21 to 23 MPa / 3045 to 3335 psi)

• Maximum Permissible Peak Intermittent Pressure: 250 bar (25 MPa / 3625 psi)

• Operational Rotational Speed Horizons: Minimum 600 rpm, with continuous operational speeds reaching 3000 rpm to 4000 rpm depending on displacement size

• Input Drive Shaft Configuration: Standard straight cylindrical keyed shaft or standard SAE involute spline

• Mounting Flange Matrix Alignment: Standard 2-bolt rectangular flange configuration (matching original Atos bolt spacing)

• Fluid Suction & Discharge Interface Setup: Side-ported standard metric/G parallel threads or standard split 4-bolt flange interfaces

• Fluid Medium Compatibility & Viscosity Horizons: Mineral-based anti-wear hydraulic oil matrices (HLP classification) or synthetic fire-resistant fluids, supporting operating viscosities from 10 cSt to 100 cSt

• Target Functional System Cleanliness Criteria: Must strictly track ISO 4406 19/16/13 criteria or better

Key Technical Advantages

• Hydrostatically Pressure-Balanced Axial Clearance Side Plates: The pump interior features floating thrust plates composed of a specialized bimetallic copper alloy composite. A precisely machined pressure balance chamber on the rear of the plates routes high-pressure fluid from the discharge side to seal the gear faces. This self-compensates for thermal expansion and mechanical wear, maintaining a high volumetric efficiency of over 95% even at 210 bar continuous pressure.

• Heavy-Duty DU Self-Lubricating Composite Journal Bearings: The internal gear journals are supported by advanced multi-layer DU composite sliding bushings instead of standard roller bearings. These bushings are continuously cooled via specialized internal fluid circulation channels. Engineered for high impact resistance, they absorb the strong radial forces generated by high speeds and high pressures to prevent internal gear-to-housing contact.

• 12-Tooth High-Precision Low-Pulsation Gear Profiles: The internal driving and driven gears are forged from premium alloy steel (20CrMnTi), case-hardened, and finished on CNC profile grinders. The optimized 12-tooth involute design significantly reduces flow pulsation and fluid-borne resonance, delivering quiet operation suitable for noise-sensitive indoor hydraulic power units.

• Aviation-Grade High-Density Extruded Aluminum Housing Matrix: The structural center body is manufactured from high-tensile extruded aluminum alloy. Engineered for exceptional fatigue resistance, it minimizes housing flex under cyclic high-pressure pulses to maintain strict internal clearances and optimize long-term mechanical efficiency.

Application Areas

Chengyuan’s high-performance replacement Atos PFG series gear hydraulic pumps deliver efficient fluid power across diverse industrial manufacturing sectors:

• Machine Tools & Metal Cutting Automation: Powering hydraulic chuck clamping cylinders, automated tool changers, tailstock positioners, and centralized machine lubrication systems.

• Plastics Machinery & Precise Injection Equipment: Serving as the high-pressure pilot fluid supply source for electro-hydraulic proportional and servo valves on molding and blow-molding equipment.

• Custom Hydraulic Integrated Systems & Power Packs: Providing dependable fluid power for waste compactors, woodworking machinery, and automated assembly line valve manifolds.

Expert Maintenance Tips

• When Aligning the PFG Gear Pump with the Drive Motor, Strictly Verify Shaft Concentricity and Always Utilize a Flexible Coupling Assembly: Because gear pumps use precision sliding journal bearings, they are highly sensitive to radial and axial misalignment. Maintain a concentric alignment tolerance within 0.05 mm; excessive runout introduces lateral forces that cause shaft seal leakage and premature bearing wear.

• Always Pre-Fill the Pump with Clean, Filtered Hydraulic Oil via the Suction Port Prior to the First Machine Start; Never Dry-Start the Unit: The internal sliding bushings and floating side plates rely on an immediate fluid film for lubrication. Running the pump dry—even for a few seconds before fluid is drawn from the reservoir—can generate excessive heat and score the precision bronze sealing faces.

• An External Safety Relief Valve Must Be Installed in the Discharge Line Near the Pump Outlet, and Its Pressure Setting Must Never Exceed the Rated 210-230 bar Limit: Because this is a fixed positive-displacement pump, any unexpected blockage in the downstream line will cause pressure to spike instantaneously, which can cause the pump casing to rupture or damage the drive motor if an override path is not available. Ensure regular relief valve testing.