Xiaoyi will introduce to you the way to deal with the unsteady pressure of the pressure reducing valve of the hydraulic press.
1. For pilot relief valves, because the pilot valves and relief valves are universal, the causes and elimination methods of pressure oscillation can be referred to the relevant parts of relief valves.
2. When the pressure relief valve is used in excess of the rated flow rate, the oscillation phenomenon of the main valve often occurs, which makes the pressure relief valve unstable. At this time, the outlet pressure appears a cycle of "boost-buck-rebound-rebound-rebound". Therefore, the pressure relief valve suitable for the type and specification must be selected, otherwise the phenomenon of unsteady pressure will occur.
3. The geometric accuracy of the main spool and body is poor, the movement of the main spool is slow and the work is insensitive. Maintenance to make its movements flexible.
4. The spring of the main valve is too weak, deformed or stuck, so that the spring can be replaced when the valve core is difficult to move.
5. Clean the damped orifice when damped orifice is blocked.
6. Exhaust when oil is mixed with air.