The three-way directional valve (also known as three-way shunt valve and three-way commutator) is a special equipment used to switch the material flow direction in the pipeline in the solid material (powder, particle, powder mixture and sheet material) conveying system. The three channels of the three-way commutator are arranged in an angle, one in two out or two in one out. The pneumatic actuator is controlled by the switching of the solenoid valve. The two positions of the spool action are detected by the limit detection switch, which is directly installed on the pneumatic actuator. When the valve works normally, the spool turns to a position. After the commutation command is issued, turn to another position, and the commutation action is completed.