How to Choose a Hydraulic Divider
2026-02-27
Of course, each method has its own advantages and disadvantages. The new spool-type/bore-type distributor is less expensive than the gear-type. Gear-type distributors are larger and heavier, but they are more resistant to contamination. A major drawback of slide-valve distributors is their sensitivity to pressure fluctuations. When throttling becomes uncontrolled, all diverting capacity is lost; spool-type distributors can also become “T”-shaped under such conditions. Another potential issue with spool-type distributors is heat generation: they operate by creating a pressure drop, which in turn produces heat. If they did not generate heat, they would not function. Under ideal conditions, both designs can achieve accuracy of 2% or better.
In general, gear-type distributors are always the highest-performing type—unless cost, size, or weight become prohibitive. Select a spool-type distributor only when the overload load is minimal, or ensure that the overload is controlled by other means, such as using a balance valve or positioning the distributor in the “meter-out” mode. Carefully consider the heat generated by the resulting flow rate and pressure drop.
Another important consideration is that, compared with gear-type distributors, spool-type distributors can, in certain applications, reduce the actuator’s speed. If overcoming the load constitutes a significant portion of the cycle time—for example, during the closing action of a timber grapple—then attempting to control that load solely to enable a spool-type distributor to function will ultimately not be an acceptable solution.