DSC is progressive dividers is generally composed of 3-10 working valve pieces, its head and tail valve pieces are working valve pieces. There are 5 displacement specifications for the working valve disc, and different displacement specifications can be selected for combination. The distributor valve disc has two side outlet structure, which can be changed to one side outlet by merging, and the displacement is superimposed. The distributor valve disc is sealed with O-ring, the whole has good sealing, stable and reliable oil.