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Regeneration Circuit with Load-Holding

Cylinders can extend with pressure on both the piston side and rod end side. This is called a regeneration circuit. The reduced effective area (rod diameter) results in a higher extension speed at a reduced foce. A counterbalance valve can be used for a smooth transition from the regeneration mode of the cylinder to the standard mode when the rod side of the cylinder is diverted to tank. A vented counterbalance is required for additional load holding on the rod end side.

  • Pilot-to-close check valve:         CO*A-XEN    
  • Vented counterbalance valve:    CW**, CA**
  • Counterbalance valve:                CB*A, CBEJ

Benefits of this circuit arrangement:

  • For fast extension of the cylinder, the pilot-to-close CO*A valve allows flow from the rod side of the cylinder to the piston side of the cylinder. This flow is additive to the pump flow. A small directional valve is sufficient for the higher flow, as the high flow in regeneration mode does not pass through that valve.
  • CB opens when the pilot pressure P times pilot ratio (usually 3) plus pressure P on the inlet to CB exceed the setting of the CB valve.  A CBEA set at 4000 psi opens to tank at P = 1000 psi
  • In regen mode, the additional counterbalance valve CW on the rod end side sees high back pressure. A vented counterbalance valve is required for load-holding to prevent unwanted cylinder extension.

For Sun technical support, contact Steve Weber.

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