Unloading valve

An unloading valve is characterized in that a positioning structure is correspondingly arranged between a valve body and a valve seat, and the valve body is matched with the valve seat in a positioning mode. The central axis of the liquid return opening coincides with the central axis of one liquid return hole, the central axis of the liquid inlet coincides with the central axis of one liquid inlet hole, and the central axis of the liquid outlet coincides with the central axis of one liquid outlet hole. The jet flow phenomenon caused by the included angle generated by misalignment of the liquid ports in the valve body and the liquid holes in the valve seat is effectively avoided, and then the service life of the valve body is guaranteed. 一种卸载阀，其特征在于：阀体与阀座之间对应设置有定位结构，阀体与阀座定位配合，使得回液口的中心轴线与其中一个回液孔的中心轴线相重合、进液口的中心轴线与其中一个进液孔的中心轴线相重合、出液口的中心轴线与其中一个出液孔的中心轴线相重合，有效避免阀体上的各个液口与阀座上的液孔不对齐产生夹角引起射流现象，进而保证阀体使用寿命。