The ejection principle of the deflected flat fan nozzle is different from that of the axially ejected flat fan nozzle. The ejection shape of the axial flat fan nozzle is formed because the liquid is ejected after being squeezed to form a flat fan ejection shape. The deflection flat fan nozzle generally means that the liquid passes through a circular hole and then hits a diversion surface. The design of this diversion surface is particularly important, and it plays a decisive role in the effect of the jet. Generally, there is a tangent to the nozzle. The arc is formed by adding a straight line.

The above is a wide-angle deflection flat fan nozzle, and there is also a narrow-angle flat fan nozzle. Its working principle is basically the same as that of a wide angle.