Product Overview
The PVS12AZ140, PVS12EH140, PVS16AZ140, and PVS16EH140 are Parker PVS series high-pressure pressure-compensated variable displacement vane pumps featuring a slanted-disc structure, with displacements of 12.8 mL/rev and 16 mL/rev respectively, and a rated outlet working pressure of 140 bar. The series delivers fast adjustment response, wide adjustment range, low noise, and high efficiency, making it suitable for open-circuit hydraulic systems.
The PVS series offers multiple control options depending on the regulator function: AZ denotes standard pressure-compensation control, while EH denotes high-precision pressure-sensing variable control.The PVS12AZ140 and PVS16AZ140 are suited for general hydraulic systems requiring stable pressure performance. The PVS12EH140 and PVS16EH140 are designed for precision hydraulic applications demanding higher pressure regulation accuracy and response speed.
Each unit is manufactured to exact Parker PVS series specifications, with mounting flange, drive shaft, port locations, and control interfaces fully dimensionally matched for drop-in interchangeability. Every pump undergoes 100% simulated load testing on our test bench, validating flow characteristics, pressure regulation accuracy, and operational stability across the rated pressure range before shipment.
Technical Specifications
PVS12AZ140 / PVS12EH140 Core Specifications
Model: PVS12AZ140 (AZ standard pressure-compensation control)
Model: PVS12EH140 (EH high-precision pressure-sensing variable control)
Series: Parker PVS Series
Displacement (Vg max): 12.8 mL/rev
Rated Outlet Working Pressure: 140 bar
Maximum Working Pressure: 140 bar
Speed Range: 1000–1800 rpm
Flow Rate (at 1500 rpm): approximately 19 L/min
Power Consumption (at 1500 rpm, 140 bar): approximately 5.0 kW
Minimum Inlet Pressure: 1.0 bar (absolute pressure 0.8 bar)
Maximum Drain Port Pressure: 0.5 bar
Oil Temperature Range: -10°C to +70°C
Viscosity Range: 22–100 mm²/s (up to 800 mm²/s during short-term startup)
Rotation Direction: Clockwise (viewed from shaft end)
Weight (approx.): 9 kg
PVS16AZ140 / PVS16EH140 Core Specifications
Model: PVS16AZ140 (AZ standard pressure-compensation control)
Model: PVS16EH140 (EH high-precision pressure-sensing variable control)
Series: Parker PVS Series
Displacement (Vg max): 16 mL/rev
Rated Outlet Working Pressure: 140 bar
Maximum Working Pressure: 140 bar
Speed Range: 1000–1800 rpm
Flow Rate (at 1500 rpm): approximately 23 L/min
Power Consumption (at 1500 rpm, 140 bar): approximately 8.7 kW
Minimum Inlet Pressure: 1.0 bar (absolute pressure 0.8 bar)
Maximum Drain Port Pressure: 0.5 bar
Oil Temperature Range: -10°C to +70°C
Viscosity Range: 22–100 mm²/s (up to 800 mm²/s during short-term startup)
Rotation Direction: Clockwise (viewed from shaft end)
Weight (approx.): 18.1 kg (single pump)
PVS Series Full Displacement Range
PVS08: 8.3 mL/rev, rated pressure 140 bar, speed 1000–1800 rpm
PVS12: 12.8 mL/rev, rated pressure 140 bar, speed 1000–1800 rpm
PVS16: 16 mL/rev, rated pressure 140 bar, speed 1000–1800 rpm
PVS25: 24 mL/rev, rated pressure 140 bar, speed 1000–1800 rpm
PVS32: 31 mL/rev, rated pressure 140 bar, speed 1000–1800 rpm
PVS40: 40 mL/rev, rated pressure 140 bar, speed 1000–1800 rpm
PVS50: 51.5 mL/rev, rated pressure 140 bar, speed 1000–1800 rpm
Data referenced from Parker PVS series official technical documentation. AZ control denotes pressure-sensing variable control, while EH denotes high-precision pressure-sensing variable control.
Key Technical Advantages
1. Dual AZ and EH Control Options for Diverse System Requirements
The PVS12AZ140 and PVS16AZ140 feature the AZ standard pressure-compensation controller, which automatically adjusts system pressure through pressure-sensing control. When system pressure reaches the set value, the pump automatically reduces displacement to near zero, maintaining only leakage compensation. This makes them ideal for injection molding machines, hydraulic presses, and other general hydraulic systems requiring stable pressure performance. The PVS12EH140 and PVS16EH140 feature the EH high-precision pressure-sensing variable controller, offering further improvements in pressure regulation accuracy and response speed, making them suitable for CNC machine tools, precision test stands, and other applications demanding precise hydraulic output.
2. Slanted-Disc Structure with Fast Adjustment Response
The PVS series utilizes a slanted-disc variable displacement structure, achieving stepless displacement adjustment by varying the swashplate angle. Compared to conventional variable vane pumps, this design offers faster adjustment response and a wider adjustment range, enabling rapid response to system pressure changes and ensuring stable output during load fluctuations.
3. Three-Section Cast Iron Housing with Large-Area, Low-Friction Guide Sleeve
The pump features a three-section high-strength cast iron housing with a large-area, low-friction guide sleeve. The cast iron construction provides excellent compressive strength and thermal stability, maintaining structural integrity in harsh industrial environments. The low-friction guide sleeve reduces wear on the swashplate kinematic pair, extending the service life of the variable mechanism while lowering drive torque requirements.
4. Low Noise Design and High Volumetric Efficiency
The PVS series is optimized in both flow passage design and vane structure, achieving low operating noise levels. The slanted-disc structure combined with a precision-machined valve plate minimizes output flow pulsation, reducing system vibration and noise. Clearances between the vanes and stator ring are precisely controlled to maintain high volumetric efficiency under rated conditions.
5. Compact Structure with OEM Interchangeability
The PVS12 weighs approximately 9 kg, and the PVS16 weighs approximately 18.1 kg as a single pump, featuring a compact structure. Mounting flanges, drive shaft specifications, inlet/outlet port positions, and control interfaces are fully matched to the original pump, enabling direct replacement without piping or bracket modification, significantly reducing equipment downtime. The PVS series supports through-drive configuration for single or multi-pump applications.
Application Areas
The PVS12AZ140, PVS12EH140, PVS16AZ140, and PVS16EH140 are widely deployed in the following machinery and systems:
Plastic Processing Equipment: Injection molding machine hydraulic systems (clamping, injection, and holding pressure circuits)
Metal Forming Equipment: Hydraulic presses, punch presses, and press brake power units
Machine Tools: CNC machine tools, machining center hydraulic clamping and tool change systems
Industrial Hydraulic Power Units: General-purpose hydraulic power packs, automation equipment hydraulic drives
Metallurgical Equipment: Small-to-medium metallurgical machinery hydraulic transmission systems
Expert Maintenance Tips
Pre-Installation Checks:
Verify pump rotation direction is clockwise (viewed from shaft end). Reverse operation is not permitted.
Fill the pump housing with clean hydraulic oil (ISO cleanliness level 16/13 or better) before installation to prevent dry-start damage to the vanes and stator ring.
Check drive shaft-to-coupling alignment: radial deviation ≤ 0.05 mm, angular deviation ≤ 0.5°.
AZ Control Adjustment (PVS12AZ140 / PVS16AZ140):
The compensation pressure of the AZ standard pressure-compensation control is adjustable within a defined range. After adjustment, tighten the sealing nut and record the setting dimension for future maintenance reference.
Maintain system cleanliness at ISO 16/13 or better to prevent contaminants from causing spool sticking in the control valve.
EH Control Adjustment (PVS12EH140 / PVS16EH140):
The EH high-precision pressure-sensing variable controller has higher requirements for oil cleanliness. System filtration should be maintained at ISO 16/13 or better.
Periodically inspect the pressure-sensing element of the controller for contamination and clean or replace as necessary.
After pressure adjustment, perform multiple pressure cycles to verify regulation accuracy and repeatability.
Hydraulic Fluid and Filtration:
Use ISO VG 46 anti-wear hydraulic oil with a viscosity range of 22–100 mm²/s. Short-term startup viscosity up to 800 mm²/s is acceptable.
Maintain system filtration at ISO 16/13 cleanliness level or better.
Replace all hydraulic fluid after the first 100 hours, then every 2000 hours or annually.
Operational Monitoring:
Minimum inlet pressure must not drop below 1.0 bar (absolute pressure 0.8 bar). If inlet pressure is low, inspect the suction filter and reservoir level.
Drain port pressure must not exceed 0.5 bar. Ensure the drain line is unobstructed and returns below the oil level in the reservoir.
Oil temperature should be maintained between -10°C and +70°C. If exceeded, inspect the cooling system and circuit leakage.
Every 1000 hours, verify pressure compensator settings for drift and re-adjust if necessary.
