Excavator John Deere 200-6210 distributor hydraulic proportional solenoid valve

      The main relief valve hydraulic pump is constantly delivering oil, but when the hydraulic pressure is too high, it will cause damage. Therefore, the hydraulic circuit is equipped with an overflow valve to prevent damage to the pump. The hydraulic cylinder is extended too long, or too short, or the hydraulic cylinder and the hydraulic motor add a lot of force, so that the hydraulic cylinder and the hydraulic motor stop, the oil sent by the hydraulic pump will not go away, so that the hydraulic device has the potential to burst, the hydraulic pressure rises very high, and the pump is too large a burden. This will bring damage to the pump, in order to make the hydraulic pressure rise to a certain extent, the oil from the pump will return to the working oil tank, it is necessary to install the overflow method, so that the hydraulic pressure does not rise too high. At the same time, the relief pressure of the relief valve can also be adjusted to determine how much kg/cm2 is allowed to rise. The relief valve is the function described above and is installed in the circuit between the hydraulic pump and the control valve, but it is generally placed together with the control valve. If the condition of the relief valve is not good, the low pressure will open, then the hydraulic pressure will not go on, and the strength of the hydraulic cylinder and the hydraulic motor will be weak. In addition, if the relief valve is not related, when the pressure rises, it will cause oil leakage, and finally the oil from the pump and the leakage of oil are the same, the hydraulic pressure can no longer rise higher, so that the strength of the hydraulic cylinder and the hydraulic motor is weak