Gear and variable pressure piston pumps are the most commonly used hydraulic systems in various applications, however, they each have their pros and cons that make them suitable for certain tasks. For one to understand why someone might prefer using variable pressure piston pumps than gear pumps it will be necessary to look at the details of hydraulic engineering, system requirements, and energy efficiency.
The first advantage that is clear with variable pressure piston pumps is the fact that they can provide varying flow rates and pressures. Unlike gears, which maintain a stable flow irrespective of any changes in pressure, with the help of an angle adjustment of the swashplate by this types of pump will lead to a variation in pump displacement thus effecting a change in fluid flow rate. It is particularly useful when there is need for different amount of forces over different speeds like manufacturing sector process construction machinery or even high performance vehicles.
Secondly, variable pressure piston pumps are generally more energy efficient compared to gear pumps. This is because they adjust themselves only as required thereby minimizing waste. Just think about a hydraulic system powering an industrial robot: when lifting, the arm may require quick strenuous movements then low pressure force while placing down. Such changing needs would be met through using a variable pressure piston pump which saves on energy. The gear pump operates at constant flow conditions hence would require either throttling or bypass methods so as to adjust system’s pressures hence leading to loss of energy.
Thirdly, there are more complex control systems associating with variable pressure piston pumps which enhance better synchronization among other parts within hydraulic systems or even mechanical plus electrical mechanisms elsewhere. This makes it easier to build highly integrated and sophisticated machinery where precise control is required; for example aviation industry or specialized industries.
Moreover, variable pressure offers longer service life than that offered by fixed volume ones. These are often made from materials that can resist different levels of pressures; hence they wear out less over time. However gear ones are simple but stronger and as such they wear out more often due to their continuous flow feature requiring maintenance or replacement frequently.
However, notably variable pressure piston pumps are expensive when initially purchased. Generally gear pumps are less complicated, easily repairable and cheaper to install. However the long-term benefits of using a variable pressure piston pump in situations where complex control is required, along with requirements of variable speeds and pressures and high efficiency overcome these initial disadvantages.
Finally, although both can be used for different purposes, piston pumps are preferred because they can adapt to changing system requirements better than gear pumps can, consume less energy; be equipped with more sophisticated control systems and last longer.
