Transient simulation of valve core movement of pilot-control globe valve in vertical pipelines
QIAN Jinyuan1, ZHU Yinfa2, LIU Buzhan1, LU Anle3, JIN Zhijiang1
1.Institute of Process Equipment, Zhejiang University, Hangzhou, Zhejiang 310027, China; 2.Engineering and Design Institute, Lishui University, Lishui, Zhejiang 323000, China; 3.Shanghai Nuclear Engineering Research and Design Institute, Shanghai 200233, China
A novel pilot-control globe valve, which can be used in vertical pipelines with a lower driving energy consumption, is proposed. A governing equation for valve core motion is obtained through a theoretical analysis of the forces applied on the valve core. A 3D simulation of valve core motion is conducted in Fluent by making use of User Defined Function(UDF)to involve different spring stiffness, steady state displacements, impact speeds and transient state displacements. The results show that there are different opening modes for different spring stiffness. For smaller spring stiffness, the valve is subject to a quicker response to flow to ensure it can work properly; however, this can more easily result in a higher impact speed. With the increasing of spring stiffness, the steady displacement of the core reduces especially beyond a turning point. Besides, the numerical transient displacements with 0.9 and 1.1 times the spring stiffness show good agreement with those obtained from a theoretical analysis. It is found out that the real spring design point should have 0.9 time the spring stiffness determined by the theoretical analysis. This paper provides a reference for designing and application of pilot-control globe valves or other valves with similar structures.
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