Excavator parts hydraulic pump SY335 1017969 24V excavator hydraulic pump

Working principle of safety valve
Each hydraulic oil circuit on the excavator has a safety valve, and every action is related to the safety valve. The safety valve is a kind of relief valve, which is composed of the spring, the spring seat, the valve needle and the oil inlet at the bottom.
When the high pressure oil enters the working device, the pressure will gradually increase through the bottom oil inlet, and gradually overcome the compression force of the spring. When the safety valve reaches the set pressure, the spring is fully opened, and the hydraulic oil enters the oil back through the valve needle, giving full play to the role of the protective working device.
Function of safety valve
The reason the safety valve is installed in the working oil circuit of each action of the main control valve is to limit the maximum pressure of the oil circuit. For example, the pressure of the main relief valve is manually adjusted. When the relief pressure of the excavator exceeds the set pressure of the safety valve, the relief valve opens to relieve the pressure, so that the working oil circuit does not exceed the set pressure of the safety valve, and the oil circuit is safe and smooth. Another function is that during the construction process of the excavator, if there is a heavy object falling from the height and hitting the cylinder, bucket, boom, etc., if there is no safety valve to protect the hydraulic oil circuit, the huge hydraulic impact will make the tubing burst, damage the spool and seal of the control valve, and even damage the main pump, so the protection function of the safety valve is very important