Why are bleed-off flow controls preferred in hydraulic systems over meter in and out flow controls?

Bleed-off flow controls are preferred in hydraulic systems primarily because they are more energy efficient. This type of flow control works by directing a portion of the fluid back to the tank rather than continuously circulating it through the system. This reduces overall energy loss because it minimizes the energy needed to maintain system pressure and flow.

When using a meter-in or meter-out flow control, the complete flow is often restricted, leading to increased pressure drops and the need for additional energy to maintain operation. On the other hand, bleed-off systems can maintain the desired pressure and flow with less resistance, allowing for more efficient use of the hydraulic fluid.

This design results in lower operational costs and less heat generation, ultimately contributing to a more efficient hydraulic system over time. The combination of these factors highlights the advantages of selecting bleed-off flow controls in hydraulic applications, focusing on performance and energy use.