Overflow valve of S10 series threaded hydraulic system

Important note:

generally speaking, it is not worth the loss to choose valves with overlapping or dead zones and nonlinear valves for closed-loop control, so it must be avoided as far as possible when selecting the type. Recommended servo characteristic proportional valve, the following are several valves that have been successfully used with DELTARMC controller in the United States. Many valves provide +10V or 4-20mA input. Be sure to choose the valve with +10V control signal. Recommended servo characteristic proportional valve, the following are several valves that have been successfully used with DELTARMC controller in the United States. Many valves provide +10V or 4-20mA input. Be sure to select the valve with ±10V control signal.

The main reasons of pressure fluctuation caused by overflow valve are as follows:

1.The pressure fluctuation is caused by the loosening of locking nut due to vibration of the screw for adjusting pressure;

2. The hydraulic oil is unclean, and there is tiny dust, which makes the main spool slide inflexible, resulting in irregular pressure changes, and sometimes the valve will get stuck;

3. The damping hole is blocked and connected from time to time due to poor sliding of the main valve core;

4. The conical surface of the main valve core is not in good contact with the conical surface of the valve seat and has not been well run-in;

5. The damping hole of the main spool is too large to play a damping role;

6. The pilot valve straightening spring is bent, resulting in poor contact between the valve core and the cone seat and uneven wear.