Hydraulic pumps

Hydraulic pumps can be categorized in many ways. Two main categories are industrial and mobile hydraulic pumps. Mobile Power Hydraulik Ltd. (MPH Ltd.) primarily stocks mobile hydraulic pumps, but general industrial pumps are also available in our inventory. However, they can also be categorized based on constant or variable displacement or whether they are single-circuit or multi-circuit types. When selecting hydraulic pumps, it is important to consider the hydraulic fluid flow requirements of the system (typically measured in liters per minute) and the pressure requirements of the hydraulic system.

Hydraulic Pump Delivery

The delivery of a hydraulic pump depends on the volume displacement per revolution (cm³/rev) characteristic of the pump and the rotational speed. The product of these two gives the actual delivery value. However, this is only valid at the pressure port, as the components of the system generate losses, so the actual delivery at the actuators will certainly be less. This loss is characterized by the system's efficiency. Thus, the delivery volume can be adjusted by changing the drive speed or replacing the pump with another type that has a different displacement.

Hydraulic Pump Drive Power

The required drive power demand (kW) is directly proportional to the product of the delivery and pressure values. The required drive torque (Nm) is, however, directly proportional to the product of the delivery per revolution and pressure values. From this, it follows that if we want a high delivery volume and therefore choose a large hydraulic pump with low speed, we can only achieve this with a drive that provides a higher torque. In the case of a low-torque drive, delivery volume can only be increased by increasing the speed.

Types of Hydraulic Pumps

Hydraulic pumps can be classified as gear pumps, bent-axis piston pumps (which are sometimes referred to as banana pumps in mobile hydraulics due to their shape), swash plate piston pumps, or vane pumps. The volume displacement per revolution of swash plate piston pumps can be adjusted by changing the angle of the plate, so these pumps fall into the category of variable displacement pumps.

Industrial Hydraulic Pumps

Industrial hydraulic pumps are generally driven by constant-speed electric motors. If flow regulation is required, a variable displacement pump is used. Nowadays, frequency inverter-driven electric motors, which make speed control simple, are becoming more common. In mobile hydraulics, hydraulic pumps are driven by a vehicle engine using a power take-off (PTO). In many working machines, the internal combustion engine directly drives the hydraulic pumps, which are used to drive the actuating cylinders and hydraulic motors.

About Our Company

Our company, Mobile Power Hydraulik Ltd., is primarily specialized in mobile hydraulics, but our product list also includes industrial hydraulic pumps and accessories. As a Parker representative, we often encounter pump units used for special machinery drives, so we can also assist with this if needed.

For any questions, please seek the professional assistance of our experienced colleagues!