Pc200-6 Excavator relief valve PC200 main relief valve 723-40-51102

The difference between relief valve and pressure reducing valve
The relief valve is to avoid system overspeed and ensure safety. The pressure reducing valve is to increase the system pressure under the premise of ensuring that the system does not lack phase.
1, the pressure reducing valve is mainly used to reduce the pressure of a branch line of the oil pressure system, so that the branch pressure is lower and stable than the main oil pressure, in the range of setting pressure, the pressure reducing valve is also turned off like the relief valve. And with the decrease of the system pressure, when the pressure set by the pressure reducing valve is reached, the pressure reducing valve is opened, and part of the oil will return to the tank (at this moment, there is a certain pressure of the oil back to the tank, the water temperature of the tank will rise), the hydraulic pressure of this branch will not rise. It plays the role of reducing pressure and stabilizing pressure on this avenue! The relief valve is different, and it is installed at the outlet of the pump to ensure that the overall pressure of the system is stable and does not overpressure. Therefore, he has the role of safety, pressure regulation, pressure regulation and so on!
2, the relief valve is usually in parallel in the system of the mountain road to play the role of pressure regulation, pressure regulation and pressure reduction, and the pressure reducing valve is usually in series on a road to play the role of pressure reduction and pressure preservation road!
3, the relief valve is normally closed, but also when the system overpressure action; The pressure reducing valve is open and depressurizes through a narrow channel.
4, the role of the relief valve is pressure regulation, overflow, overload protection. The pressure reducing valve reduces the pressure, and the pressure in a certain part of the oil pressure system is reduced. Different uses. Therefore, it cannot be replaced.