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How to Choose a Hydraulic Divider

2026-02-27

Summary:One major drawback of slide valve distributors is their sensitivity to pressure fluctuations. In the case of uncontrolled throttling, all diversion capabilities disappear, and the spool type splitter may also be a "T".

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.

 

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