In a hydraulic system composed of a gas-liquid booster pump and a box, each pressure measuring element has a relatively moving surface. For example, there is a certain clearance between the inner surface of the hydraulic cylinder and the outer surface of the piston due to relative movement.
If one side of the gap is high-pressure oil and the other side is low-pressure oil, the high-pressure oil will flow to the low-pressure area through the gap, causing leakage. At the same time, because the sealing of hydraulic components is not perfect, some oil will leak out. This leakage leads to the reduction of actual flow, which is what we call flow loss.
The flow loss affects the operation speed, and the leakage is difficult to avoid completely. Therefore, the rated pump flow in the hydraulic system is slightly larger than the maximum flow required by the system. It can also be estimated by multiplying the maximum flow required for system operation by a factor of 1.1 to 1.3.
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