How to set the pressure of the relief valve/safety valve/pressure cut-off valve in a closed system?
The closed system is equipped with an oil replenishment relief valve 1, a safety valve 2, a pressure cut-off valve 3, a pump cold start valve 4 (many closed systems do not have this valve), and a flushing relief valve 5. Different relief valves have different functions
Distinguish and elaborate.
1. Refill the oil relief valve 1 and flush the relief valve 5
The oil replenishment relief valve 1 is used to set the system's oil replenishment pressure and, in conjunction with the flushing relief valve 5, is respectively used to flush the pump bearing and the motor bearing. The set pressure of the oil replenishment relief valve 1 is usually 20 to 30bar. To ensure oil replenishment
Set a reasonable overflow flushing volume. The set pressure of the flushing relief valve 5 should be slightly lower than that of the oil replenishment relief valve 1 by approximately 4 to 8bar.
2. Safety Valve 2
Safety valve 2 is used to prevent system overload and it represents the maximum short-term normal working pressure of the system. The set pressure is determined by the maximum external load of the system and the displacement of the motor.
3. Pressure Cut-off valve 3
Pressure cut-off valve 3 and safety valve 2 are used in conjunction. Pressure shut-off valve 3 is used to function when the system is instantaneously overloaded (for example, when a wheel is stuck). When the system is instantaneously overloaded, if only safety valve 2 is relied upon
Therefore, this instantaneous high-pressure stage may damage the pump and motor. Therefore, the pressure shut-off valve 3 (with a smaller specification and faster response) opens to take effect, reducing the pump's displacement to 0. Therefore, the setting of the pressure shut-off valve 3 is usually the norm
About 10 to 20bar.
4. Cold start relief valve
When starting up, due to the oil temperature being too low, the pump was sucked dry, causing damage to the pump. The oil temperature is low, and the pressure difference through the filter is large. The system cannot establish control pressure, and the oil automatically passes through the cold start relief valve to generate heat. Therefore, cold start

The set pressure of the oil replenishment relief valve is approximately 2 to 5bar.

Common models of Atos solenoid valves:
Atos solenoid valve DHA-0751/2/PA-GK 21
Atos solenoid valve DHZO-A-073-S5/18
Atos solenoid valve DK-1831/2/A
Atos solenoid valve DKE-1631/2/FV 24V
Atos solenoid valve DKE-1713 24DC
Atos solenoid valve DLEHM-3C 10
Atos solenoid valve DPHA-1631/2/PA-M/7-24DC/EXDIICT4
Atos solenoid valve DPZO-AE-273-D5/GI 50
Atos solenoid valve SDHE-0713PDC10+COE-24DC/10 24VDC 30W T-830-ZS
Atos solenoid valve SDHI-0714 23 DC24V
Atos solenoid valve DLEHK-3C DC24V
Atos solenoid valve MAP-320
Atos Solenoid Valve MAP-320(20)
Atos solenoid valve MAP-320-20
Atos solenoid valve AGIR-10/100
Atos solenoid valve AGIR-10/350
Atos solenoid valve AGIR-32/210 41
Atos solenoid valve HG-031/100
Atos solenoid valve HG-031/210/23
Atos solenoid valve KG-031/210
Atos solenoid valve RZGO-A-033/315 31
Atos solenoid valve RZGO-A-033/50 31

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