Do you know the role of these accessories of excavator?

It is well known that the engine is the heart of the excavator and the power source of the vehicle.But there is an excavator accessories, its role is not to be underestimated, it is the excavator solenoid valve.Today Volvo construction machinery accessories Xiaobian to bring you to know it.
Principle of action:
PC-EPC valve is mainly to sense the actual speed of the engine and adjust the main flow rate of the hydraulic pump of excavator accessories to the corresponding signal.Due to the change of working conditions, the speed of the engine will also change, and the flow rate of the hydraulic pump matched with the engine will also change accordingly.

The change of engine speed is transmitted to the computer through the speed sensor installed on the flywheel shell of the excavator accessories, and then the computer issues the command of the change of hydraulic pump flow. The PC-EPC solenoid valve receives this command through the PC valve to adjust the flow of the hydraulic pump appropriately, so as to correspond to the change of engine speed.
In addition, the current size of the PC-EPC solenoid valve is also related to the monitor instructions, hydraulic pump pressure and other factors.
Excavator solenoid valve
PC-EPC solenoid valve function:
Computer board by rotating speed sensor to detect the actual engine speed, when the load increases, cause the loss of engine speed, the computer board to excavator parts of PC - EPC valve issue instructions and make the flow to the PC - EPC instruction current of solenoid valve in accordance with the drop with increasing of the engine speed, to reduce the hydraulic pump of swash plate Angle, reduce the output flow of hydraulic pump,So that the engine speed recovery.
Fault phenomena:
The vehicle each work device speed is slow, black smoke is serious when holding back the car flameout, poor handling and other faults.