High and low pressure work is a workmanship feature of the four-column hydraulic machine. At low speed, high pressure can work at the same time. When the low pressure pump is not working, the one-way valve action causes the low pressure oil to return to the cabin through the safety valve.
The operating speed of the four-column hydraulic machine is determined in this way: the hydraulic mechanical load of the hydraulic machine is large, and the working pressure of the hydraulic machine is high. Therefore, in order to ensure that the pump is not overloaded, it is necessary to reduce the flow and reduce the operating speed of the hydraulic machine. The load is small and the working pressure is low, so ensure that the output power does not exceed the hydraulic oil pump, in case you can increase the flow rate, which will increase the operating speed of the hydraulic machine.
Generally speaking, hydraulic machines operating at high speeds only flow. In other words, a large flow rate becomes faster, a small flow rate becomes slower!
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