In this study, industrial ball valves used in a variety of industrial fields, fluid-structure interaction analysis, torque measurement and numerical analysis was carried out. Industrial ball valves control the flow of the key components of the valve ball and seat ring assembly by actually loads and loads are caused by the pressure of the fluid. Thus, the receiving seat ring load flow-structure analysis was carried out through a flexible interpretation. In addition, the opening and closing of the valves was measured via the torque required tests, abrasion tests performed on a sheet based on the results of the friction coefficient measured by performing a theoretical analysis of the experimental results and the analytical results is verified by comparison. This ball valve design techniques to minimize the torque was obtained. The results of this study can be summarized as follows.

(1) Analysis of the Flow ball valve opening and closing of the valve angle increases, the rate of fluid inflow showed a tendency to decrease, the vortex interval was increased. In addition, the ball valve of the flow- structure analysis, 0° the lowest stress is 6.3MPa, 70° in stream degree, just before the closing body touches the seat ring and 66.9MPa at the site of maximum stress occurred. The seat ring is the yield strength of the material is 78MPa of Nylon6 to a value lower than the valve that can be structurally stable. However, due to the long-term use can result in fatigue failure fatigue is likely to believe that this should be done further. In addition to greater safety by reducing the stress that is deemed necessary redesign.

(2) In general, the ball valve is used as the material of the sheet material is PTFE, PEEK, Nylon6 abrasion tests conducted for the results, PTFE has the lowest coefficient of friction values ??shown, but compared with other materials, the size of the wear that require high durability because of industrial valve seat material was considered irrelevant. In addition, the materials used in this study is the interpretation of the Nylon6 the average coefficient of friction was measured to be 0.15.

(3) compression load torque measured under a load of 500N through experimental maximum value of the torque in the counterclockwise direction 0.89N·m, from clockwise to 0.84N·m was measured using a torque gauge torque measurement experiments average 3.78N·m (± 0.74) of the value, respectively.

(4) Compression load torque analysis and interpretation opening torque measurement error rate compared with 8% and 12.78%, respectively, reliability of the interpretation is highly likely. Based on the results of the optimization of the ball valve was designed. Believe is the most efficient in the three cases were all reduced torque, optimize Design A (UL: 2.35mm, SC: 0.24mm, CC: 3.29mm) 62% reduction in the torque is considered as the most efficient design.

Finally, through a ball valve seat ring opening torque receive loads and reduce the proposed optimal design geometry was established through two design alternatives, the value added by the foundation was a systematic study of the valve. In addition, a comparison of the measured and interpreted by the value of high-reliability torque analysis method is proposed.