1. Constant pressure variable displacement pump. The device can achieve the purpose of excavator operation based on the flow output of the compression pump, and can save the excess oil in the relief valve compared with the hydraulic control of the relief valve. Therefore, it can effectively reduce the waste of oil.
2. Constant power variable pump. The principle of the pump is to control the amount of oil output based on the output pressure. It can keep the prime mover under full load, so it has the characteristics of high power, high efficiency and low consumption.
3. Constant pressure and constant power variable displacement pump. The power of the prime mover is very small, but it can output appropriate flow. It has low hydraulic power, low heat dissipation demand and can work without relief valve to ensure energy saving in the whole process.
In addition, solenoid valve unloading variable displacement pump, negative flow control, load sensitivity are also common variable displacement pump energy saving options.
Compared with valve control measures, pump control hydraulic equipment has better energy saving, but considering its production cost, working cost and operation performance, valve control still plays a dominant role in actual production. But under the theme of energy saving, we also need to ensure the high quality, excellent performance, economy and stability of the hydraulic valve system, at the same time, we also need to achieve energy saving through reasonable design and regulation.
