What is "system working pressure" in hydraulic construction machinery, and how does it affect equipment performance?

System working pressure refers to the maximum pressure that the hydraulic system of the equipment (including hydraulic pumps, cylinders, and valves) can stably maintain during normal operation. It directly determines the force output of the working device:

Higher system pressure (e.g., 34-38 MPa for large excavators) means stronger digging force or lifting force—for example, an excavator with higher hydraulic pressure can break harder rock or lift heavier materials.

However, system pressure cannot exceed the rated pressure of hydraulic components (pumps, hoses, seals); otherwise, it may cause component leakage, damage, or even system failure.

Manufacturers usually match the pressure to the equipment’s designed working load to ensure reliability.

Why is "hydraulic oil flow rate" an important parameter for hydraulic machinery?

Hydraulic oil flow rate refers to the volume of hydraulic oil delivered by the hydraulic pump per unit time (usually measured in L/min). It mainly affects the response speed of the working device:

Higher flow rate means faster movement of the working device—for example, an excavator with a hydraulic flow rate of 200 L/min can lift the boom or swing the upper structure more quickly than one with 150 L/min, improving overall work efficiency.

Similar to pressure, flow rate must match the design of the hydraulic system: excessive flow may cause "flow saturation" (valves cannot handle the oil volume, leading to jitter), while insufficient flow results in slow, sluggish operation.