Piston pumps
Piston Pumps
Piston pumps are widely used in hydraulic power systems where high efficiency and the ability to operate under high pressure are required. To generate pressure and transfer hydraulic fluid, piston pumps perform a reciprocating motion of pistons driven mechanically. These pumps operate with high precision and are employed wherever precise control of flow and pressure is essential.
How Do Hydraulic Piston Pumps Work?
Hydraulic piston pumps work by moving pistons inside the cylinders of the pump housing. The pistons move back and forth due to the drive shaft's rotation, which is connected to a swash plate or rotor. When a piston moves down, it creates a vacuum that draws fluid through the inlet valve. When the piston moves up, it compresses and pushes the fluid into the hydraulic system. Pumps with adjustable swash plates allow flow regulation by changing the plate's angle. Depending on the design, piston pumps can be axial or radial, differing in piston arrangement relative to the drive shaft.
Piston Pumps and System Performance
Piston pumps are known for their high efficiency, measured as the volume of fluid displaced per shaft revolution. Thanks to their design and number of pistons, piston pumps achieve significant flow rates despite their compact size. They can operate at pressures ranging from 350 to 700 bar, making them suitable for heavy-duty industrial applications.
They feature high mechanical efficiency with minimal internal leakage, reducing energy consumption and enhancing overall hydraulic system efficiency. Depending on the application, piston pumps can be equipped with pressure, flow, or power regulators to improve functionality and allow precise control of operating parameters.
Key Considerations When Selecting Hydraulic Piston Pumps
Important criteria when selecting piston pumps include flow rate, operating pressure, size, and materials of construction. The pump must be matched to the required fluid volume and maximum system pressure. Resistance to wear, corrosion, temperature, and harsh industrial environments is crucial. A well-chosen piston pump ensures reliable operation even under demanding conditions. Additionally, factors such as seal type, cooling methods, and diagnostic options should be considered, especially for continuous or heavy-duty use.
Features of Variable Displacement Piston Pumps
Variable displacement piston pumps allow adjustment of the flow by changing the angle of the swash plate. Reducing the angle lowers the flow, while increasing it raises the flow rate. This leads to energy savings because the pump supplies only the fluid volume currently needed by the system. Such pumps are especially useful in load-sensing hydraulic systems and other applications requiring dynamic flow and pressure adjustments.
