Rexroth Relief Valve - How does the relief valve adjust the pressure?

Create Date: 2024-8-30 12:03:23|Source: Rexroth/Rexroth

1. Constant pressure overflow: In the throttling adjustment system of the quantitative pump, the fixed pump provides a constant flow rate.

2. When the system pressure increases, the flow demand decreases.

3. At this time, the safety valve is opened, so that the excess flow is returned to the oil tank to ensure that the inlet pressure of the safety valve, that is, the outlet pressure of the pump, is constant (the valve port is often opened with pressure fluctuations).

4. Pressure stabilization: the relief valve is connected in series on the oil return road, the relief valve generates back pressure, and the stability of the moving parts increases.

5. System unloading function: the remote control port of the relief valve is connected to the solenoid valve with small flow in series, and when the electromagnet is energized, the remote control port of the safety valve is connected to the oil tank, and the hydraulic pump is unloaded at this time.

6. At this time, the safety valve is used as a safety valve.

7. Safety protection function: when the system is working normally, the valve is closed.

8. Only when the load exceeds the specified limit (the system pressure exceeds the set pressure), the relief valve will be opened, and the overload protection will be carried out to make the system pressure no longer rise (usually the set pressure of the safety valve is 10%-20% higher than the maximum working pressure).

9. Extended information: the principle and function of the relief valve: the working principle is the same as that of the three-section concentric pilot relief valve, except that the oil enters the upper cavity of the main valve from the lower cavity of the main valve through three damping holes.

10. The damping holes 2 and 4 are connected in series, which are equivalent to three damping holes on the main spool of the same core valve.

11. They are oil inlet throttle valves in half-bridge circuits.

12. The effect is to make the pressure difference between the lower cavity of the main valve and the front cavity of the pilot valve act on the upper cavity of the main valve through the damping hole 3, so as to control the opening of the main valve core.

13. The main function of the damping hole 3 is to improve the stability of the main line shaft, which has nothing to do with the bridge.

Rexroth Relief Valve - How does the relief valve adjust the pressure?

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