YXL priority valve is a fixed differential pressure reducing hydraulic component, no matter how the load sensing steering system load pressure and oil pump oil supply changes, the priority valve can keep the flow of the supply steering gear is always equal to the product of the steering wheel speed and the steering gear displacement to ensure the required flow of the steering gear. It is used with BHR5, BPB5, BPBS5T and other load sensing full hydraulic steering gear. Widely used in agricultural machinery, construction machinery, forklift and other fields. It is divided into dynamic signal and static signal in two forms