Effects of sleeve opening on flow characteristics of double-layer sleeve valve
JIANG Yongbing1, HOU Congwei2, HAO Jiaoshan1, WANG Weibo1, YU Longjie2, QIAN Jinyuan2, JIN Zhijiang2*
1. Chongqing Chuanyi Control Valve Co., Ltd., Chongqing 400707, China; 2. Institute of Process Equipment, Zhejiang University, Hangzhou, Zhejiang 310027, China
Abstract：In order to study the influence of the inner and outer sleeve holes diameter on the flow coefficient and pressure drop flow characteristics of the double-layer sleeve valve, the steady numerical model of the double-layer sleeve control valve based on the compressible superheated steam flow is established by suing CFD. The differences of flow coefficient and pressure drop flow characteristics of different inner and outer sleeve hole diameter combination models under full opening condition is compared and analyzed. The research indicates that holes diameters of sleeves have significant influence on the pressure drop of each sleeve. When the holes diameter of the inner and outer sleeves is proportionally enlarged, the pressure drop of each sleeve hardly changes. When only the holes diameter of the outer sleeve is increased, the fluid velocity in the gap between the inner and outer sleeves increases continuously. When the holes diameter of the inner and outer sleeves is proportionally enlarged, the fluctuation of the fluid velocity in the gap between the inner and outer sleeves decreases. When a small increase in the flow coefficient is needed, it can be achieved by increasing the holes opening diameter of the outer sleeve; When a great increase of the flow coefficient is needed, the opening holes diameters of the inner and outer sleeves should be increased proportionally at the same time. The results have a certain valuable guiding significance for the design of the holes diameter in the sleeve valve.
