The difference between the pressure reducing valve and the relief valve

1. The Pressure Reducing Valve keeps the pressure at the outlet constant, while the overflow valve keeps the pressure at the inlet constant;

2. When not working, the inlet and outlet of the pressure Reducing Valve are intercommunicated, and the inlet and outlet of the flow valve are not accessible;

3. In order to ensure that the pressure regulating valve outlet pressure setting value is constant, its pilot valve spring chamber needs to be separately connected to the oil tank through the oil drain port; and the overflow valve outlet is straight through the fuel tank, so its pilot valve spring chamber and leakage oil It can be connected through the passage and the oil outlet on the valve body, without having to externally connect the fuel tank (of course, it can also leak).

The main difference of zui: the overflow valve is the inlet pressure control, that is, the inlet pressure is controlled. If the pressure is higher than the set value, the spring in the overflow valve is opened, and the high pressure oil is returned to the tank through the leak port; the pressure reducing valve is Export pressure control, as the name suggests, is to control export pressure.