PVXS250 Eaton Vickers Piston Pump 350Bar

Product Overview

The PVXS Series Heavy-Duty Axial Variable Piston Pumps (covering PVXS66, PVXS90, PVXS130, PVXS180, PVXS250, and heavy industrial PVWS-250 models, including specific configuration codes like PVWS-250M07R00C1R01SVVAD and PVWS-250M07R0001R01SCVAD) are high-pressure fluid power solutions engineered for heavy-duty industrial and mobile open/closed hydraulic circuits. Manufactured in strict accordance with Eaton Vickers OEM engineering standards, this series provides 100% drop-in mechanical, hydraulic, and control interchangeability. Constructed with heavy-section ductile iron housings, hydrostatically balanced valve plates, rigid swashplate assemblies, and heavy-duty tapered roller bearings, the PVXS pump operates quietly while supporting 350 bar continuous rated working pressure. Every pump is subjected to 100% factory bench testing under simulated full-load pressure and dynamic control conditions to ensure an immediate, reliable replacement for original Vickers pumps.

Technical Specifications 

• Full Model Series: PVXS / PVWS Series (Representative Model: PVXS250 / PVWS-250; Part Codes: PVWS-250M07R00C1R01SVVAD, PVWS-250M07R0001R01SCVAD; Series covers PVXS66, PVXS90, PVXS130, PVXS180)

• Nominal Displacement: 250 cm³/rev (PVXS250/PVWS-250; series displacement range 66 to 250 cm³/rev)

• Continuous Rated Pressure: 350 bar (35 MPa / 5000 psi)

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

• Max Rated Speed: 1800 RPM (at 1 bar absolute inlet pressure)

• Control Options: Electro-hydraulic proportional displacement control, pressure compensation, load sensing (ES, DFR, DP, C1/C2 options)

• Rotation: Clockwise (CW) or Counter-Clockwise (CCW) available

• Mounting & Porting: Standard SAE/ISO mounting flange with high-pressure SAE 4-bolt flange fluid ports

• Net Weight: Approx. 215 kg (PVXS250 / PVWS-250)

Key Technical Advantages

• 100% Drop-In Eaton Vickers Fit: Mounting coordinates, shaft splines, main SAE port flanges, and pilot control connections strictly mirror OEM Vickers specifications for seamless plug-and-play field replacement.

• Hydrostatically Balanced Efficiency: Features precision-ground, hydrostatically balanced valve plate and cylinder block surfaces, minimizing internal fluid blow-by and delivering over 95% volumetric efficiency under high pressures.

• Low-Noise Rigid Construction: Built with a sound-damped ductile iron housing, thick swashplate supports, and high-precision sliding couples to absorb operational vibration and ensure low-noise performance in heavy factory settings.

• Heavy-Duty Bearings & 100% Load Tested: Equipped with oversized tapered roller bearings designed for severe radial/axial loads. Every unit is 100% bench-tested for full-pressure holding, displacement response, and case drain leakage prior to shipment.

Application Areas

• Heavy Metallurgy & Steel Mills: Rolling mill screw-down systems, blast furnace top drives, and heavy forging press primary hydraulic stations.

• Plastics & Injection Molding: Large injection molding machine high-pressure injection, clamping units, and blow molding equipment.

• Mining & Heavy Construction: Main thrust hydraulic circuits for tunnel boring machines (TBM), mining roadheaders, and hydraulic block presses.

• Marine & Offshore Machinery: Marine deck winches, deep-sea towing winches, and offshore Hydraulic Power Units (HPU).

Expert Maintenance Tips

• Mandatory Case Filling Before Startup: Always fill the pump housing with clean hydraulic oil (approx. 4.0 to 5.0 liters) through the uppermost drain port prior to initial motor start-up to avoid dry friction on the swashplate and piston shoes.

• Independent Low-Pressure Drain Line: Connect the case drain line directly and independently to the reservoir below fluid level. Keep case pressure strictly under 0.5 bar to preserve the shaft seal integrity.

• Maintain Rigorous Fluid Cleanliness: Maintain hydraulic fluid cleanliness to ISO 4406 18/16/13 (NAS Class 7) or better. Regularly replace 10-micron high-pressure filter elements to guarantee responsive, trouble-free operation of the proportional control valves.