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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2007

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Modified design for the poppet in check valves

Lee S. W., Shin D. Y., Byun C. W., Yang H. J., Paek I. C.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 23, nr 1

67-70

Purpose: of this paper: The check valve, which is composed of sleeve, connector and poppet, is the one direction valve that blocks fluid flow. The sleeve and connector are constrained and fixed. But the position of the poppet is swiftly moved by the direction of the fluid pressure. In this check valve, water hammer is applied to the poppet by rapid pressure change. Impact of the water is a reason why the fracture of the poppet is occurred. Using computational fluid dynamics (CFD) and finite element method (FEM), the design of the poppet was verified and modified to avoid the fracture. The diameter of the flow path in the poppet decreased from 6.0 mm to 5.0 mm. By CFD, differential pressure of the modified design was compared with differential pressure of the initial design. So, safety for the structure of the poppet was analyzed and verified using available commercial software MSC.MARC. Based on the numerical results, differential pressure increased about 8.7 %. However, Von Mises stress of the old poppet with 6.0 mm was two times that of the new poppet. It is verified and disclosed from the experiment results that the newly modified poppet had no problem being used in a practical product. Design/methodology/approach: In this paper, pressure loss was calculated by CFD. As such, safety for the structure of the poppet was analyzed and verified using available commercial software MSC.MARC. Findings: Safety and pressure loss of the modified design are obtained from CFD and FEM. Research limitations/implications: CFD is very complicated in regards to boundary and surface condition of the wall such as surface roughness. Therefore, calculated results using CFD are definitely verified by practical experimentation. Practical implications: When the design is modified, the number and expense of the experiment is reduced. Originality/value: The new design for the poppet was analyzed and modified by CFD and FEM. So the modified poppet was verified through the real experiment and is available in a practical product.