The differences between the forward and backwardstepping process of the twoway stepping fluidic sprinkler of type PXSB50 were analyzed to study the stability of the sprinkler. The gasliquid twophase flow in the pipes for controlling forward and backwardstepping process was studied and the pressure difference in the pipes was compared. The length of the deriving fluid tube, the size and position of the air compensating hole have influence on forward or backwardstepping frequency and angle, spraying range. The frequency was increased but the spraying range was with reducing length. For the same length, the forwardstepping frequency was considerably higher than the backwardstepping frequency; accordingly the spraying range in the forwardstepping process was smaller than that in the backwardstepping process. The closer the air compensating hole was placed to the reversing mechanism, the faster the stepping frequency becomes, and the smaller both the stepping angle and the spraying range get. For the twoway stepping fluidic sprinkler of type PXSB50, an optimum combination of the length of the deriving fluid tube, the size and position of the air compensating hole was obtained by theoretical analysis and experiment, those parameters as follows: the length of the deriving fluid tube 378 mm, the length of the forwardstepping pipe 648 mm, the length of the backwardstepping pipe 648 mm, the diameter of the forwardstepping air compensating hole is 2.0 mm, the diameter of the backwardstepping air compensating hole is 25 mm, the position of the forwardstepping air compensating hole is 3 mm.
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