Dear Experts

We have a turning machine with chuck having hi/lo pressure. Required pressure for Hi chucking pressure is 15 bars and for low it is 8 bars
Problem that we are facing is during changeover from hi to lo chuck pressure, hi pressure is increasing upto 18 bars and lo upto 11/12 bars
Please refer to spec of valve attached
We have taken following actions :


  1. Taken out and serviced hi ands low pressure direction control valve - manually pushed the valve to feel movement of spool inside, found alright
  2. This valve operating with 110VDC, replaced valve with valve operating with 24V DC - after electric modification via relay
  3. Check valve opened up and serviced
  4. No leakages observed in the hydraulic power pack


Request your suggestions

Regards