The directional valve is a section structure, and can be expanded according to needs, with a maximum of 8 working sections; The telescopic luffing adopts a parallel circuit and the winch adopts a series parallel circuit combination; The directional valve has a compact structure and low pressure loss; The working port can be equipped with secondary relief valves according to requirements; The main form of control is manual control; This directional valve is a dual pump oil inlet, the dual pumps supply oil to winch when the winch below the setting pressure.The single pump supply oil to winch when the pressure is higher than the setting pressure.