Regenerative (Regen):
This often causes a little confusion with newcomers to hydraulics and I hope that I can make it easy to understand. We use the Regen circuit when we need a fast extend e.g approach cycle on a machine tool. Very simply, when extending we only displace the rod volume not the cylinder volume.
This means that the rod will move out faster but will have a much reduced force due to its area.
When we reach the point where we need the large force then we can switch out the Regen and apply pressure over the whole piston area. The ram will now move slower but we only need force not speed. Regen can only work on the extend stroke, however the ram will return quickly due to the anular area.
Be careful! with too large a rod the benefits may not be worth while. If rods are too small the force may not be large enough to overcome seal friction.
Bob
Read more about Regen on www.hydraulicbrain.com
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