Fixed Displacement Pumps for Continuous Pressure
Fixed displacement pumps serve to supply a hydraulic system with a continuous flow of hydraulic fluid. They are installed in many systems to provide the base load. An additional pump is usually engaged for peak demand.
Characteristics of Fixed Displacement Pumps
The most important characteristics of fixed displacement pumps:
- Long service life
- Easy replacement
- Reliable pressure generation
- Provision of sufficient base load
Fixed displacement pumps are typically flange-mounted externally. In the event of a defect, this allows for easy replacement with a spare pump.
Types of Fixed Displacement Pumps
The following designs have become established for fixed displacement pumps:
Although one might assume that a fixed displacement pump should consist of as few moving parts as possible, the opposite is true. While pumps for the pressure range up to 350 bar are also available as gear or vane pumps, there is significant demand for fixed displacement pumps that deliver up to 500 bar pressure. The axial piston pump has become established for this purpose. Through the use of high-quality materials, even these complex devices can provide the required service life.
Applications of Fixed Displacement Pumps
Operating fixed displacement pumps requires an equally reliable drive. Particularly robust electric motors are primarily used for this purpose. These are usually dimensioned to generously exceed the actual torque and speed requirements for operating the fixed displacement pump. This does not provide power reserves for peak demand. The reason for this oversizing lies primarily in ensuring adequate supply to the pump at all times.
Repair of Fixed Displacement Pumps
Fixed displacement pumps have the task of maintaining the basic functions of a hydraulic system. They are therefore also responsible for emergency operation characteristics or for maintaining minimum pressure to safely shut down the system. To fulfill this task, fixed displacement pumps are designed for maximum ease of maintenance. It cannot be assumed in every situation that a replacement unit is always available. For these cases, fixed displacement pumps are designed to be disassembled, cleaned, and reassembled as easily as possible. Typically, a small selection of common spare parts is sufficient for overhauling fixed displacement pumps. The following selection is recommended as a stock of spare and wear parts:
- Seals
- Bearings
- Piston rings if applicable
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