Hydraulic Pumps and Motors: A Buying Guide for Facility Managers

Executive buying summary

Hydraulic pumps and motors are essential components in many industrial and medical systems, converting mechanical power into hydraulic power to drive cylinders, motors and other actuators. Selecting the correct type and specification is crucial for reliable operation and efficient performance. The total cost of ownership is influenced by factors such as energy efficiency, maintenance requirements, and the longevity of the components. A significant risk to avoid is selecting equipment that is not compatible with the existing hydraulic system, leading to potential damage and downtime.

• Careful consideration of the application and operating environment is vital for selecting the appropriate hydraulic pump or motor.
• Understanding the differences between various equipment types, such as gear, vane, and piston pumps, is key to optimising performance.
• Adherence to relevant safety standards and regulations, including PUWER and LOLER, is paramount for ensuring a safe working environment.
• Traceability of components and adherence to manufacturing quality standards, such as BS EN ISO 9001, are essential for reliability.
• Regular maintenance and adherence to manufacturer recommendations are crucial for extending the lifespan of hydraulic equipment.

Equipment types compared

Key features to look for

• Displacement: The volume of fluid moved per revolution directly impacts the system's power output; confirm it aligns with the application's needs.
• Pressure Rating: Ensure the pump or motor can safely handle the maximum system pressure to prevent failure and potential hazards.
• Efficiency: Higher efficiency reduces energy consumption and running costs; request performance curves and data sheets.
• Noise Levels: Consider noise reduction measures, especially in environments with noise restrictions; ask about noise dampening features.
• Fluid Compatibility: Verify compatibility with the hydraulic fluid being used to prevent degradation and damage; consult fluid specifications.
• Mounting Options: Confirm the mounting configuration suits the existing system and allows for easy installation and maintenance.
• Sealing Technology: Robust sealing is crucial for preventing leaks and maintaining system performance; inquire about sealing materials and design.
• Filtration Requirements: Understand the required filtration levels to maintain fluid cleanliness and extend component life; check ISO 4406 cleanliness levels.

Pros and cons of each equipment type

Gear Pump

Pros:

• Simple design and relatively low cost.
• Robust and reliable for a wide range of applications.

Cons:

• Lower efficiency compared to other types.
• Can be noisy in operation.

Vane Pump

Pros:

• Good volumetric efficiency.
• Relatively compact design.

Cons:

• More complex than gear pumps.
• Can be susceptible to wear if fluid cleanliness is poor.

Piston Pump (Axial)

Pros:

• High pressure capability.
• Good efficiency.

Cons:

• More complex and expensive than other types.
• Requires more precise maintenance.

Piston Pump (Radial)

Pros:

• Extremely high pressure capability.
• Suitable for demanding applications.

Cons:

• Very complex and expensive.
• Requires specialist knowledge for maintenance.

Hydraulic Motor (Gear)

Pros:

• Simple and robust design.
• Relatively low cost.

Cons:

• Lower efficiency compared to other motor types.
• Can be noisy in operation.

Which facilities each type suits

• Gear Pump: General manufacturing, material handling, and low-pressure applications.
• Vane Pump: Mobile equipment, industrial machinery requiring moderate pressure and efficiency.
• Piston Pump (Axial): Heavy-duty machinery, hydraulics power units, and applications requiring high pressure.
• Piston Pump (Radial): Specialist equipment, high-pressure testing, and applications demanding extreme pressure capabilities.
• Hydraulic Motor (Gear): Conveyor systems, rotary actuators, and applications requiring simple, robust rotation.

Buyer's checklist

1. Confirm the required flow rate and pressure for the application.
2. Verify compatibility with the existing hydraulic system (fluid type, pressure ratings).
3. Check the supplier's experience and reputation for supplying hydraulic components.
4. Request detailed technical specifications and performance data.
5. Ensure the equipment meets all relevant safety standards and regulations (PUWER, LOLER).
6. Inquire about the availability of spare parts and service support.
7. Clarify warranty terms and conditions.
8. Assess the supplier's quality control processes and traceability procedures (BS EN ISO 9001).
9. Consider the lifecycle costs, including energy consumption and maintenance requirements.
10. Arrange for operator training on the safe operation and maintenance of the equipment.