Parker PVS Piston Pump | PVS08 PVS12 PVS16 PVS25 EH140C2 Variable Pump

The Parker PVS Series from LIC Hydraulic is a range of compact, axial variable displacement piston pumps designed for open-circuit hydraulic systems. Covering displacements from $8\text{cc}$ to $25\text{cc}$ (including PVS08, PVS12, PVS16, and PVS25), this series is the preferred choice for industrial and mobile applications where high efficiency and rapid response are mandatory. Models like the PVS25EH140C2 are equipped with high-precision pressure compensators to minimize power loss. We guarantee 100% mechanical interchangeability and subject every pump to 100% simulated response testing, ensuring peak performance at the rated pressure of $140\text{ bar}$.

Technical Specifications (Bulleted List)

• Series: Parker PVS Series

• Displacements: $8.0, 12.0, 16.0, \text{and } 25.0\text{ cm}^3\text{/rev}$

• Rated Pressure: $140\text{ bar}$ ($2000\text{ psi}$)

• Peak Pressure: $210\text{ bar}$ ($3000\text{ psi}$)

• Max Speed: $1800\text{ RPM}$

• Control Type: EH (Pressure Compensator Control)

• Mounting: SAE Standard flanges

• Rotation: Right-hand (Standard) or Left-hand options

• Seal Material: High-quality NBR or Viton (FKM)

Key Technical Advantages

• Ultra-Compact Envelope: The streamlined housing makes the PVS series ideal for integration into crowded machine tool compartments or small hydraulic power units (HPUs).

• Rapid Compensator Response: Engineered with a fast-acting displacement control mechanism, the pump can de-stroke to zero flow in milliseconds once the set pressure is reached, protecting the system and saving energy.

• Whisper-Quiet Operation: Advanced valve plate timing and sound-dampening materials ensure that noise levels remain exceptionally low even at full pressure, complying with strict indoor industrial standards.

• High Volumetric Efficiency: Precision-machined pistons and cylinder blocks ensure minimal internal leakage, maintaining a volumetric efficiency of over $95\%$ across the standard operating range.

Application Areas

• Machine Tools: Clamping, tool changing, and lubrication circuits for CNC centers.

• Small HPUs: Power sources for lifting tables, laboratory test rigs, and compact presses.

• Ag-Machinery: Auxiliary control circuits for tractors and seeding equipment.

• Light Industry: Packaging machinery, injection molding auxiliary drives, and positioning systems.

Expert Maintenance Tips

• Compensator Calibration: The “140” indicates the max setting. After installation, fine-tune the compensator screw to match your specific system requirements. Always ensure the pump compensator is set at least $10\text{–}15\text{ bar}$ below the system’s main safety relief valve.

• Case Drain Management: An external case drain line is mandatory. It must be routed directly to the tank below the oil level. Keep case pressure below $1\text{ bar}$ ($14.5\text{ psi}$) to prevent shaft seal blowout.

• Temperature Control: Due to its small surface area, the PVS pump relies on system cooling. Maintain oil temperatures between $30\text{–}60^\circ\text{C}$ ($86\text{–}140^\circ\text{F}$) to ensure stable control response and prevent premature wear of internal rotating groups.