Vehicular hydraulic system with relief valve

摘要

A vehicular hydraulic system having a hydraulic pump, a first hydraulic application and a second hydraulic application arranged in series. A relief valve is arranged parallel with the second application to allow fluid to bypass the second application when fluid pressure upstream of the second application exceeds a threshold value. The first and second applications may be a brake assist device and a steering gear assist device. The hydraulic system may also include a priority valve for diverting a portion of the fluid flow to the second application when the pressure upstream of the first application exceeds a threshold value. The threshold value for the first application may be greater than the threshold value for the second application. The hydraulic system may include a pump having a discharge rate that falls within a predefined range. A check valve may also be arranged parallel with the relief valve and second application.