Influence of opening and closing process of ball valve on external performance and internal flow characteristics

Cavitation occurring in a sleeve regulating valve not only increases the energy waste of the whole piping system but also causes severe and costly damage to the valve body and the piping system. In this paper, in order to reduce the cavitation inside the sleeve regulating valve, the effects of different valve core shapes, including flat bottom, ellipsoid, circular truncated cone, and cylinder, on cavitation are investigated by using a cavitation model. The pressure, velocity, and vapor volume fraction distribution in the regulating valve are obtained and compared for different valve core shapes and valve core displacements. The total vapor volumes are also predicted and compared. The results show that vapor primarily appears in the gap between the sleeve and the valve core surface. The cavitation intensities for the ellipsoid and cylinder valve cores are greater than those for the other two valve cores. With the increase of the valve core displacement, the total vapor volumes for all four valve core shapes first increase and then decrease. This work is of significance for the optimization and design of sleeve regulating valves.

Effect of valve core shapes on cavitation flow through a sleeve regulating valve

\n Process valves are responsible for regulating and controlling the rate and direction of flow in pipeline systems. The V-port ball valve is one kind of process valve with a regulating performance influenced by V-angle. In this article, a DN50 V-port ball valve is taken as the research object. This work therefore aims to investigate the effect of and relationship between the V-angle on valve performance and internal flow properties via experiments and numerical simulations. Results indicate that an increase in either V-angle or valve opening causes a large-pressure fluctuation near the valve outlet, thus leading to a long pressure-stable distance. Meanwhile, the flow coefficient increases exponentially with valve opening, and the value of the exponent remains at 2.5 for different V-angles. Furthermore, the stable position of internal energy loss along the downstream pipe is well-matched with the stable position of external pressure fluctuation. This inspires a new method for controlling the pressure stability downstream from the valve. These results may facilitate improvements in the design and optimization of the process valve, thus benefiting the development of fluid transport techniques in energy industries.

An Experimental and Numerical Study of Regulating Performance and Flow Loss in a V-Port Ball Valve

Turbulent compressible flow analysis on multi-stage high pressure reducing valve

Svein Edvardsen

Papers

Experimental and numerical study of single-phase pressure drop in downhole shut-in valve

Experimental and numerical study of two-phase pressure drop in downhole shut-in valve with Unified Comprehensive Model formulation

Two-Phase Flow in a Down-Hole Shut-In Valve

Multiphase Flow in Complex Valve Geometry