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Throttles for speed control

The function is simple: By reducing the flow cross-section, the volume flow decreases and thus the extension speed of a cylinder or the rotational speed of an hydraulic motor also has to decrease. Throttles have no polarity, that means the direction of the oil flow throgh the throttle is freely selectable.

Symbol hydraulic throttle - non-adjustable and adjustable

Symbol hydraulic throttle - non-adjustable and adjustable

Note: Adjustable throttles have a throttle screw with which you can increase or decrease the circular cross-section.

Regarding the throttle the flow rate depends on:

  • The opening cross section itself
  • From the effective pressure difference. If for example pressure increases due to load on the actuator, this represents a higher hydraulic resistance. The pressure difference at the throttle inevitably decreases and the volume flow also decreases.
  • The viscosity of the oil used. This is particularly noticeable on components with a high oil flow rate. This also includes throttles.

Hydraulics - Throttle - function and circuit example

When you use throttles?

When the load is constant or when fluctuations in the load are insignificant.