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首页> 美国卫生研究院文献>Micromachines >Numerical Study of the Microflow Characteristics in a V-ball Valve
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Numerical Study of the Microflow Characteristics in a V-ball Valve

机译：V球阀中微射线特性的数值研究

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摘要

V-ball valves are widely applied in many process industries to regulate fluid flow, and they have advantages of good approximately equal percentage flow characteristics and easy maintenance. However, in some applications, the V-ball valve needs to have good performance under both large and extremely small flow coefficients. In this paper, the improvement of the original V-ball valve is made and the flow characteristics between the original and the improved V-ball valve are compared. Two types of small gaps are added to the original V-ball, namely the gap with an approximately rectangular port and the gap with an approximately triangular port. The effects of the structure and the dimension of the gap on flow characteristics are investigated. Results show that within the gap, the flow coefficient increases but the loss coefficient decreases as the valve opening increases, and the flow coefficient has an approximately linear relationship with the flow cross-area of the added gap. Results also show that under the same flow cross-area, the flow coefficient has a higher value if the distance between the gap and the ball center is greater or if the gap is an approximately rectangular port, while the loss coefficient has an opposite trend.
机译：V-Ball阀门广泛应用于许多工艺行业来调节流体流动，并且它们具有良好的大致相等的流量特性和易于维护的优点。然而，在某些应用中，V-Ball阀在大而极小的流量系数下需要具有良好的性能。在本文中，制造了原始V滚珠阀的改进，并比较了原始和改进的V杆阀之间的流动特性。将两种类型的小间隙添加到原始V领之间，即具有近似矩形端口的间隙和具有近似三角形端口的间隙。研究了结构和间隙的尺寸对流动特性的影响。结果表明，在间隙内，流量系数增加但随着阀门开度的增加而降低损耗系数，并且流量系数与添加间隙的流动交叉区域具有大致线性关系。结果还表明，在相同的流量交叉面积下，如果间隙和球中心之间的距离更大或者间隙是近似矩形端口，则流量系数具有更高的值，而损耗系数具有相反的趋势。

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