Abstract: In this paper, the piston type valve core and the unbalanced moment on its bottom are studied. To decrease the influence of non-common geometrical factors, a simplified model of the piston type globe valve is proposed in this study. Based on the computational fluid dynamics (CFD) method, the effects of different geometrical parameters on the unbalanced moment existing on the bottom of the valve core, which include the bending radius of the inlet flow channel, the diameter of the special-shaped pipe, and the height of the valve core, are studied. Finally, the effects of geometrical parameters on the unbalanced moment on the bottom of the valve core are clarified by correction and variation classification and provide a basis for further optimizing the structure of the piston type valve. The results show that the unbalanced moment decreases with the increase of the bending radius of the inlet flow channel, but increases with the increase of the diameter of the special-shaped pipe and the height of the valve core. Moreover, the relation between the unbalanced moment and flow rate is proposed.

Key words: Piston type valve core; Unbalanced moment; Geometrical parameters; Computational fluid dynamics (CFD)

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