It is mainly used in fixed pump systems of construction equipment. The directional valve is a section structure, which can be expanded according to needs, with a max of 8 working section; it can realize various circuit combinations of parallel circuits, series-parallel circuits, and series circuits; the directional valve has a compact structure and low pressure loss; It is required to set up a secondary relief valve; the control forms mainly include pneumatic control and manual control.This directional valve enables bilateral operation.