The Vickers PVH074 is a high-pressure, high-efficiency axial piston variable displacement pump developed by Vickers (a renowned brand under Eaton Corporation). As a key model in the PVH Series, it is specifically designed for high-pressure, medium-power industrial and mobile hydraulic systems, integrating advanced hydraulic technology and robust structural design to deliver reliable performance, precise flow control, and excellent energy-saving effects in heavy-duty working conditions.

1. Model Overview

The Vickers PVH074 is a swashplate-type axial piston variable displacement pump, which adopts a stepless displacement adjustment structure with the swashplate as its core component. It is a fixed-frame-size model in the PVH Series, with a nominal displacement of 74 cc/rev, catering to high-pressure hydraulic systems with medium flow demands. Its variable displacement design allows the output flow to be flexibly and accurately adjusted according to real-time system pressure and flow requirements, achieving optimal energy utilization and stable system operation.

2. Structural Features

• High-Pressure Axial Piston Design: The PVH074 is equipped with high-precision axial pistons evenly arranged around the cylinder block. Driven by the rotation of the swashplate, the pistons perform stable and smooth reciprocating motions along the cylinder block axis to complete the suction and discharge of hydraulic oil. This optimized design ensures high volumetric efficiency (up to 98% under rated conditions) and a compact structure, making it suitable for installation in limited space of various heavy-duty equipment. The precision fit between pistons and cylinder bores further improves the pump’s leakage resistance and working stability under high pressure.
• Precise Variable Displacement Mechanism: Displacement adjustment of the PVH074 is realized by changing the swashplate angle, which supports hydraulic, electro-hydraulic, and manual control modes (electro-hydraulic control as standard configuration). It is equipped with pressure compensation and flow compensation functions, and optional load-sensing control, enabling the pump to automatically adjust displacement based on real-time system demands, effectively reducing energy loss and ensuring precise flow output.
• Robust and Durable Construction: The cylinder block, pistons, and swashplate of the PVH074 are fabricated from high-strength alloy structural steel, undergoing precision machining, heat treatment, and surface hardening processes. This ensures superior wear resistance, corrosion resistance, and high-pressure bearing capacity, enabling the pump to withstand long-term stable operation under high-pressure working conditions. The pump housing is made of high-quality cast iron with reinforced rib design, providing excellent rigidity and shock absorption to adapt to harsh industrial and mobile working environments.
• Integrated High-Performance Valve Group: The PVH074 comes standard with an integrated valve group, including pressure relief valves, check valves, and flow control valves, which reduces the need for additional hydraulic components and simplifies the overall system layout. Optional configurations include electro-proportional control valves, anti-cavitation valves, and load-sensing valves, which can be customized to meet the specific requirements of different application scenarios.

3. Working Principle

When the PVH074’s drive shaft is connected to a prime mover (such as an electric motor or engine) and starts rotating, the cylinder block rotates synchronously with the drive shaft. Under the combined action of centrifugal force and the spring force of the return plate, the pistons are tightly attached to the surface of the swashplate. Due to the inclined angle of the swashplate, the pistons reciprocate linearly in the cylinder bores during the rotation of the cylinder block, completing the cyclic process of oil suction and discharge. The precision-machined components ensure stable displacement adjustment and consistent flow output throughout the working cycle.

During the half-cycle where the piston moves outward (away from the center of the cylinder block), the volume of the cylinder bore increases, forming a negative pressure, and hydraulic oil is sucked into the cylinder bore through the suction port. During the other half-cycle where the piston moves inward (towards the center of the cylinder block), the volume of the cylinder bore decreases, the hydraulic oil is compressed to high pressure (consistent with the rated pressure of the pump), and then discharged from the discharge port. By adjusting the angle of the swashplate, the stroke of the pistons can be changed, thereby altering the pump’s displacement and realizing stepless and precise adjustment of output flow. The pressure generated during the compression process follows the basic pressure formula P=F/A, ensuring stable and controllable pressure output.

4. Performance Advantages

• Excellent High-Pressure Performance: The PVH074 is specifically designed for high-pressure operation, with a rated working pressure of 42 MPa and a maximum intermittent pressure of 48 MPa, which is suitable for various high-pressure hydraulic systems. Its high-pressure bearing capacity is ensured by the optimized structural design and high-quality materials, enabling long-term stable operation without failure under rated pressure conditions.
• High Efficiency and Energy Saving: The optimized hydraulic circuit design, precision-machined components, and advanced variable control mechanism of the PVH074 ensure high volumetric efficiency and mechanical efficiency, effectively reducing energy loss and improving the overall energy utilization rate of the hydraulic system. The precise displacement adjustment avoids unnecessary energy waste caused by excessive flow output.
• Stable, Quiet and Low Vibration Operation: The swashplate of the PVH074 adopts a hydraulic balance design, and the rotating components undergo precision dynamic balance treatment, which minimizes vibration and noise during operation. This ensures smooth and reliable performance even under high-speed and high-pressure working conditions, protecting the overall hydraulic system and extending the service life of related components.
• Long Service Life and Strong Reliability: The adoption of high-quality materials, advanced manufacturing processes, and effective lubrication and cooling systems significantly extends the service life of the PVH074. The modular design of key components enhances the pump’s reliability, reduces the risk of failure, and lowers maintenance costs. The precision heat treatment of core components further improves their wear resistance and service life.
• Easy Maintenance and Wide Adaptability: The PVH074 adopts a modular structure, which is convenient for disassembly, inspection, and maintenance. Wear parts (such as pistons, seals, and bearings) are standardized and easy to replace, reducing downtime. It also has strong anti-pollution capacity and can adapt to harsh working environments such as high temperature and high humidity, maintaining stable performance in various industrial and mobile scenarios.

5. Application Fields

The Vickers PVH074 axial piston variable displacement pump is widely used in high-pressure, medium-power hydraulic systems in various industries, relying on its excellent high-pressure performance and reliability, including but not limited to:

• Industrial machinery: High-pressure hydraulic stations, large extruders, heavy-duty presses, and precision industrial equipment that require high-pressure and stable flow output.
• Mobile equipment: Medium-sized construction machinery (excavators, loaders, crawler cranes), mining machinery, and offshore engineering auxiliary equipment.
• Other fields: Marine hydraulic systems, metallurgical equipment, oilfield machinery, and aerospace ground support equipment that require high-pressure hydraulic power.

6. Installation and Maintenance Notes

• The PVH074 should be installed on a solid, flat, and vibration-damping base to avoid vibration interference, which may affect the pump’s performance and service life. The drive shaft must be accurately aligned with the prime mover’s shaft to prevent misalignment, which may cause bearing damage and oil leakage.
• Use clean hydraulic oil that meets the specified grade (recommended ISO VG 46 or VG 68), and ensure the hydraulic system is equipped with a high-precision filter (filtration accuracy ≤ 10 μm) to prevent impurities from entering the pump and damaging precision components. This is crucial for maintaining the pump’s high-pressure performance and extending its service life.
• During operation, regularly check the oil level, oil temperature (normal working temperature: 40℃ – 80℃), and operating noise. If abnormal phenomena such as oil leakage, excessive noise, overheating, or pressure fluctuation occur, stop the machine immediately for inspection and troubleshooting to avoid further damage to the pump and related components.
• Perform regular maintenance in accordance with the operating manual, including replacing hydraulic oil (every 2000 – 4000 working hours), cleaning the filter, inspecting the wear of key components (pistons, swashplate, seals, etc.), and tightening loose fasteners. When replacing wear parts, use genuine Vickers accessories to ensure the precision fit and performance of the pump.

With its excellent high-pressure performance, high efficiency, reliability, and easy maintenance, the Vickers PVH074 axial piston variable displacement pump has become the preferred choice for hydraulic system designers and users in high-pressure, medium-power heavy-duty application fields, providing stable and efficient hydraulic power support for various equipment.