PVXS250 Eaton Variable Piston Pump 350Bar

Product Overview

Engineered to handle the punishing requirements of extreme high pressures and continuous heavy loads in industrial hydraulic systems, our industrial-grade PVXS series variable axial piston pump delivers uncompromising performance. Encompassing model codes such as PVXS-250-M-R-DF-0000-000 and the broader PVXS lineup (PVXS-066, PVXS-090, PVXS-130, PVXS-180, PVXS-250), this pump features a high-rigidity swashplate design built for open circuits. It serves as a 100% drop-in replacement for original Eaton Vickers units. As a dedicated manufacturer of high-pressure fluid power equipment, we master precision machining and heat-treatment technologies. Every pump undergoes 100% simulated working condition load testing prior to dispatch, guaranteeing superior volumetric efficiency, low operating noise, and precise control response under continuous 350-bar operation.

Technical Specifications

• Complete Model Code: PVXS-250-M-R-DF-0000-000 (Covering PVXS-066, PVXS-090, PVXS-130, PVXS-180, PVXS-250)

• Pump Type: Heavy-Duty Axial Piston Variable Pump, Swashplate Design (Open Circuit)

• Rated Displacement: 250 cc/rev (Infinitely variable)

• Nominal Operating Pressure: 350 bar (35 MPa / 5000 psi)

• Peak Operating Pressure: 420 bar (42 MPa / 6000 psi)

• Maximum Speed: 1800 rpm (Self-priming)

• Control Method: DF (Pressure Compensator with Remote Control capability)

• Rotation: Right-hand (R, Clockwise, viewed from drive shaft end)

• Mounting Standard: M (Metric ISO mounting flange and metric key/spline shaft)

• Weight: Approx. 155 kg

Key Technical Advantages

• 100% Drop-in Interchangeability: Precision-engineered to exact OEM specifications using CNC grinding and reverse engineering. Mounting flanges, drive shaft dimensions, main ports, and case drain locations match the original Eaton Vickers PVXS-250 identically, enabling direct, modification-free field replacements.

• High-Strength Bimetallic Rotary Group: The bimetallic cylinder block is cast with high-strength bronze-steel composites and paired with carbonitrided steel pistons and wear-resistant brass slippers. This construction easily withstands continuous 350-bar operating pressures and 420-bar pressure spikes without galling.

• Efficient DF Pressure Compensator Control: Features a highly responsive DF pressure compensator valve that supports remote control. When the system pressure hits the preset cutoff limit, the pump instantly destrokes to minimum displacement, drastically reducing wasted power and oil heating.

• 100% Simulated Working Condition Testing: Zero tolerance for batch sampling. Every assembled pump undergoes rigorous full-load pressure shock tests, DF controller response calibrations, and thermal equilibrium validations on automated test benches to ensure performance that meets or exceeds OEM benchmarks.

Application Areas

Specifically designed for open-loop hydraulic power units in heavy stationary industrial applications. It is widely utilized in large metal forging presses, scrap metal balers, heavy-duty injection molding machinery, marine and offshore winch drives, mining crushers, and metallurgical blast furnace hydraulic stations.

Expert Maintenance Tips

• Mandatory Pre-filling & Air Bleeding Protocol: Prior to initial startup, completely fill the pump casing with clean hydraulic fluid through the highest case drain port to expel trapped air. Never dry-run the pump, as a lack of immediate lubrication will instantly destroy the slipper pads and valve plate.

• Strict Case Drain Line Backpressure Limit: The case drain line must be routed independently back to the reservoir (terminating below the fluid level). Ensure internal casing pressure remains strictly below 1.5 bar (absolute) under all operating conditions to safeguard the drive shaft seal.

• Rigorous Fluid Cleanliness Maintenance: The precision spools inside the DF compensator valve are highly sensitive to particulate contamination. Maintain fluid cleanliness at ISO 4406 level 18/16/13 or better, and adhere to a strict replacement schedule for system filters.