PURPOSE: To spray a disperse system for a long time without reducing the charging quantity even in the case of using the disperse system such as a coarse grain material or resinifying material by providing a plurality of paths for passing the disperse system from a coupling side to a space chamber of a spray head through the inner part of a piston.

CONSTITUTION: The spray head 5 is connected to the one side end of a case 11 and the coupling 9 is connected to the other side end thereof, and the piston 1 provided by winding a spring 8 in the inner part is provided so as to be moval in the axial direction. The piston 1 is provided with the inlet path 3 for the disperse system at the coupling side, extended to the nozzle side and divided into two pieces of the outlet paths 4. The disperse system is jetted in the radiating state or in the axial direction to the inner wall of the spray head 5 formed as the space chamber 2 by changing to various angles of the paths formed with boring. Therefore, the coarse granular material and resinifying polymer can be sprayed without reducing the charging quantity.