The circuit shows a balanced logic element that is used to unload the cylinder without decompression shock. The logic valve is opened by a low controlled pressure that is just sufficient to open the valve against flow forces.
- Normally closed balanced logic: DK*C, DK*S
- Direct-acting pressure-reducing/relieving: PR**
Benefits of this circuit arrangement:
- The circuit allows gentle unloading of the accumulator that is used to maintain a clamping force. Decompression shocks are common when a force is maintained with an accumulator.
- The advantage of the balanced logic element DK** is that it opens smoothly regardless of the pressure to be unloaded. The opening force on the valve can be adjusted by the setting of the PRDB.
