Abstract
Fixed-cone (Howell-Bunger) valves have been in wide use for many years for flow control. These valves may face different types of damages and failures due to vibrational stresses during operation. In this study, a number of modal analyses of a Howell-Bunger (DN: 1000 mm) valve were conducted using the Finite Element Method (FEM), and its natural frequencies with vibrational mode shapes in five cases including fully opened, 20-, 40-, and 80%-opening conditions were determined; subsequently, the dimensionless coefficient “Mercer” was obtained for the valve. The result showed that the operating point of the valve is the flow rate of 16 m3/s and valve opening degree of 40%; in this case, due to reinforcement resulting from moving shell, the structure strength against vibration increases, and as a result, natural frequency increases as well.
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