Traditional hydraulic piston pumps are inclined to operate at a constant displacement. Though the design is simple, it cannot be changed with system load variation, and it is vulnerable to getting wasted and inefficient with energy. Nevertheless, for special purposes, load sensing hydraulic piston pumps and hydraulic variable displacement piston pumps have emerged and are the key driver for improving the efficiency of hydraulic systems.
Hydraulic variable displacement piston pumps optimize the flow output by compensating for the displacement in real time depending on system demand in order to avoid unnecessary energy consumption. Load sensing hydraulic piston pump also introduces load sensing technology on top of this, which has the capability to automatically adapt the pump displacement and flow according to the system load changes in order to have the system in the optimum state of operation at all times. These technologies are not only used to make the hydraulic system more energy-saving and efficient but also smarter in responding to pressure change or load variation, aiming to maximize the overall safety and efficiency of the system.
Working principle of hydraulic variable displacement piston pump
Hydraulic variable displacement piston pump is the most common pump used in hydraulic systems. Its basic feature is the ability to automatically adjust the displacement according to changes in load. This means that the pump will be monitoring the system's pressure demand in real time when operating and adjusting its displacement size according to this demand. Unlike traditional fixed displacement pumps, hydraulic variable displacement piston pumps are capable of automatically adjusting the size of displacement when the load changes, thereby achieving energy saving and high efficiency.
The structure of a hydraulic variable displacement piston pump usually includes multiple pistons and an inclined pump disc. When the pump is running, the piston moves through the inclination angle of the pump disc to adjust the discharge of the oil. By changing the angle of the pump disc, the piston pump can achieve displacement changes and accurately control the flow rate.
This design can effectively cope with load fluctuations. When the load increases, the pump displacement increases to ensure sufficient flow supply to the system; when the load decreases, the displacement automatically decreases to avoid unnecessary energy waste. This dynamic adjustment capability makes hydraulic variable displacement piston pumps the first choice for efficient and energy-saving hydraulic systems.
Poocca Hydraulic Manufacturer sells variable piston pumps: parker PV P2, Rexroth A10VSO A15VSO A8VO, Toyooki HPP-VB2V HPP-VC2V and other brand series. For more series, please contact us.
Hydraulic axial piston pump with load sensing and pressure limiting control
The hydraulic axial piston pump with load sensing and pressure limiting control function is an advanced version of the hydraulic variable displacement piston pump. After the technical upgrade, it has the ability of intelligent adjustment, which enables it to be accurately adjusted according to the load changes and pressure requirements of the system. The core of this technology is to further improve the stability, safety and energy efficiency of the hydraulic system through the optimization of load sensing and pressure limiting control.
Load sensing control technology
Load sensing control technology is one of the key functions of hydraulic axial piston pumps with load sensing. It relies on load sensors (usually marked with **"LS"** symbols or circuit icons with load sensing words) to monitor load changes in the hydraulic system in real time. Through this technology, the pump can automatically adjust the displacement according to the real-time load to ensure that the system is always in the best working state, thereby improving the overall work efficiency and energy efficiency.
Specifically, when the system load is low, the load sensing sensor will send a signal to the hydraulic pump, and the pump will automatically reduce the displacement based on this feedback, thereby avoiding excessive hydraulic oil output and reducing unnecessary energy consumption. With an increase in load, the sensor will increase the pump displacement proportionally to the load requirement so that the hydraulic system will have adequate flow and pressure to cater to the operational requirements at high load.
For example, when the actuator of the hydraulic system (such as a hydraulic cylinder or hydraulic motor) is operating under no-load or light-load conditions, the pump will reduce the displacement to reduce energy consumption; while under heavy load conditions, the pump will automatically increase the displacement to ensure that the system can output sufficient flow to ensure work efficiency and stable operation of the equipment.
Pressure Limit Control Technology
Pressure limit control (usually represented by **"PRV") is another key function in hydraulic axial piston pumps, mainly used to protect the hydraulic system from damage caused by excessive pressure. This control function ensures that when the pump reaches the set maximum working pressure, it will automatically take measures to limit the displacement or stop the oil supply to prevent the hydraulic system from being damaged by excessive pressure. This function can ensure the safety of the system and can provide certain prevention in the case of high-load operation or unexpected load surges.
The fundamental issue of pressure limit control technology is this: when the operating pressure of the hydraulic system exceeds the set point, the pressure limit control unit will automatically and immediately change the displacement of the pump. or reduce the pressure of the system by regulating the system valve to avoid overflow operation. Not only is this capable of protecting the various components of the hydraulic system from damage, but also effectively checking against problems such as hydraulic oil leakage, bursting of pipes or seal damage resulting from too high pressure.
In addition, the pressure limit control function can also reduce the energy waste caused by excessive pressure in the system. For example, if the pressure is too high in some parts due to resistance or system imbalance during the operation of the system, the pump will automatically adjust the displacement to reduce the energy consumption of excessive output and help the system maintain a safe and efficient working state.
Adjustment mechanism and changes
The hydraulic axial piston pump with load sensing and pressure limit control responds to load and pressure changes in the hydraulic system in real time through a comprehensive adjustment mechanism. The load sensing function enables the pump to dynamically adjust the displacement according to different load requirements to adapt to actual working conditions; while the pressure limit function ensures that the system will not exceed its designed maximum working pressure under any circumstances to protect the safety of equipment and systems.
When the load and pressure of the hydraulic system change, the displacement of the pump will be adjusted accordingly. For example, when the system load is reduced, the displacement is reduced and the system pressure drops accordingly; when the load is heavier, the pump displacement increases and the pressure rises accordingly until the set maximum working pressure value is reached. In this process, the pressure limit control system plays a key role in preventing overpressure and ensuring that the system will not fail due to excessive pressure.
Signs and symbols
The load sensing mark on the hydraulic pump is usually denoted as LS, indicating that the pump is equipped with the feature of load sensing control. The PRV symbol is usually utilized to indicate the mark for pressure limit control, indicating that the pump is equipped with a pressure relief valve or equivalent pressure controlling device. Users may easily determine by these symbols and indications the functional characteristics of the pump and properly use it within the hydraulic system.
Hydraulic axial piston pumps with load sensing and pressure limit control provide extremely high operational flexibility and safety for hydraulic systems through intelligent displacement adjustment and pressure control. Load sensing technology enables the pump to automatically adjust the flow according to load changes to avoid energy waste, while pressure limit control technology effectively protects the hydraulic system and prevents equipment failure caused by overpressure. The combination of the two greatly improves the overall performance, work efficiency and safety of the hydraulic system. By using these functions properly, enterprises can significantly reduce energy consumption, extend the service life of equipment, and reduce maintenance costs, bringing higher cost performance to the hydraulic system.
Key factors to improve system efficiency
Energy saving is the most important advantage of hydraulic piston pumps with load sensing and pressure limiting control functionality. Traditional hydraulic pumps possess fixed displacement and can't be adjusted according to load requirements, so energy is lost. The hydraulic variable displacement piston pump enables the hydraulic system to make efficient use of energy through real-time adjustment of the displacement. When the load is light, the pump will lower the displacement itself to avoid over-supplying; when heavy load is existing, the pump will raise the displacement itself in order to make the system get sufficient flow.
The load sensing pump system can also sense the pressure and flow requirement of the hydraulic system in real time and optimize the output of the pump. This dynamic adjustment maintains the system in its optimal working condition at all times, thereby improving work efficiency. Through reduced energy waste, the hydraulic system can operate more efficiently with less energy.
Improve equipment reliability and extend service life
In addition to energy saving, hydraulic piston pumps with load sensing and pressure limiting control also play an important role in improving system reliability and extending equipment service life. Traditional fixed displacement pumps may have problems such as uneven load and pressure fluctuations during operation, which not only affects work efficiency, but also may accelerate the wear of the pump body and other components. Hydraulic piston pumps with load sensing function can dynamically adjust the flow rate according to load demand, avoiding system failure caused by excessive oil supply or excessive pressure.
By adopting pressure limiting control, the pump can also effectively prevent the system from being damaged due to overpressure. When the system pressure reaches the predetermined threshold, the pump automatically adjusts the displacement to ensure that the system is always within the safe range. This function not only reduces the incidence of equipment failure, but also greatly reduces maintenance costs.
Piston pump scope of application and application examples
Hydraulic piston pumps with load sensing, especially hydraulic variable displacement piston pumps and hydraulic axial piston pumps with load sensing and pressure limiting control, have been widely used in different sectors and fields.
In construction equipment, hydraulic systems are usually under the impact of big load oscillations. With load-sensing hydraulic piston pumps, it can be ensured that the machinery can operate smoothly in various work conditions. In farm machinery, high efficiency in hydraulic pumps can enhance work efficiency and reduce fuel consumption. In industrial automation equipment, load-sensing pumps can ensure the efficiency and reliability of hydraulic systems under long-term working conditions.
For example, heavy construction machinery such as excavators and bulldozers typically need to operate under the conditions of high pressure and high load. The use of hydraulic piston pumps with pressure limiting and load sensing control has the potential to make the hydraulic system more stable, reduce the energy consumption of the machine, and increase the work efficiency.
From the foregoing analysis, we can see that hydraulic piston pumps with load sensing function, specifically hydraulic variable displacement piston pumps and hydraulic axial piston pumps with load sensing and pressure limiting control, have played a very important role in improving the efficiency of hydraulic systems, reducing energy waste, and improving equipment reliability. With the technology continuing to develop, the potential uses of these hydraulic pumps will be increasingly wider, and they are able to provide more efficient and effective hydraulic power solutions to various industries.
hydraulic variable displacement piston pump FAQ
Q1: What is the difference between a hydraulic piston pump with load sensing and an ordinary hydraulic pump?
A1: A load-sensing hydraulic piston pump can automatically adjust the pump displacement in response to variations in system load, thereby providing more efficient energy usage and reducing avoidable energy wastage. Most hydraulic pumps are fixed displacement pumps and cannot be modified in accordance with variations in load, thereby leading to inefficient systems and excessive energy usage.
Q2: How are hydraulic variable displacement piston pumps useful in improving hydraulic system efficiency?
A2: Hydraulic variable displacement piston pumps dynamically change the displacement in real time, which allows the hydraulic system to adjust dynamically to the changing load needs. When there is a light load, the pump automatically reduces the displacement so that it won't over-supply; when there is a heavy load, the pump adds displacement to ensure the system has sufficient flow. This adjustment operation avoids energy wastage and optimizes the system's efficiency.
Q3: What are the advantages of load sensing technology for hydraulic systems?
A3: Load sensing technology enables hydraulic pumps to sense the system load in real time and automatically adjust displacement according to demand, optimize flow output, and make the system always operate in the best operating state. The technology not only saves energy but also prevents excessive consumption and system instability effectively, especially in the case of applications with large fluctuation in load.
Q4: Applications to which hydraulic piston pumps with load sensing are most ideally suited:
A4: Hydraulic piston pumps with load sensing find routine use in agricultural vehicles, construction equipment, mining machines and other hydraulic systems requiring precise load adjustment. Especially ideal for situations involving massive load fluctuations, they can automatically adjust the displacement according to actual demand in order to ensure the hydraulic system runs at all times in an efficient manner.
Q5: How to maintain a load sensing hydraulic piston pump?
A5: To guarantee the long-term and efficient operation of a hydraulic piston pump with load sensing, the operating condition of the load sensor, the pressure control system and the hydraulic oil cleanliness must be inspected periodically. Replace the hydraulic oil periodically and check the pump sealing, and ensure that the oil system pressure is normal. In addition, in accordance with the operation and maintenance manual of the manufacturer, it can actually extend the service life of the pump and offer steady operation of the system.
These FAQs will help explain the advantages, application and maintenance of load sensing hydraulic piston pumps. If you have any further questions or need technical support, please don't hesitate to contact our customer service department.
