Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Stress Analysis of a Trunnion Ball Valve for Ball Weight Reduction

이축 볼밸브의 볼 경량화를 위한 응력해석

  • Kim, Hyung-Woo (Offshore Plant Research Division, Korea Research Institute of Ships and Ocean Engineering) ;
  • Cho, Su-gil (Offshore Plant Research Division, Korea Research Institute of Ships and Ocean Engineering) ;
  • Park, Jane (AlphaEng) ;
  • Lee, Jaehwan (Naval Architecture and Ocean Engineering, Chungnam National University)
  • 김형우 (선박해양플랜트 연구소 해양플랜트 산업기술센터) ;
  • 조수길 (선박해양플랜트 연구소 해양플랜트 산업기술센터) ;
  • 박제인 ((주)알파이엔지) ;
  • 이재환 (충남대학교 선박해양공학과)
  • Received : 2019.09.17
  • Accepted : 2020.02.07
  • Published : 2020.02.29
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Abstract

A valve product can be over-designed or too heavy. Finite element analysis was performed using ANSYS for two and three-dimensional ball valve models, and the ball weight was reduced by optimization within the allowable design criteria. The ball is structurally safe according to the computed stress values, which are within the material's admissible stress. The weight was reduced by about 22%, and the structural safety factor was 1.25. The structural safety of the seat insert and ring, which are used to prevent leakage, was confirmed through finite element analysis. It is shown that the two-dimensional analysis can result in similar values to the three-dimensional analysis for the axisymmetric structure. The redesign of the valve is not included in the results since such changes require a whole new design process, including all valve components.

고압을 받는 플랜트용 제품 설계 시에 대부분 강건 구조를 지양하다 보면 안전율이 높아지고 중량이 과다 해지는 문제가 있다. 본 논문은 플랜트용 이축 볼밸브 볼의 경량화를 위하여 밸브의 3차원 모델링과 ANSYS를 적용한 유한요소해석으로 응력해석을 수행한 후에, 허용 응력 범위와 설계 변경 제한 조건 내에서 최적화 과정으로 볼의 중량 감소를 달성하였다. 약 22%의 볼 중량이 감소되었고 응력은 증가하였으나 안전계수는 1.25가 되었다. 볼의 일부분에 과도한 응력이 있으나 대부분 재료의 항복응력 허용치 내에 있어 안전한 상태이다. 유동의 흐름을 제어하는 실링 (seal) 역할을 하는 시트 인서트와 시트 링 등 밸브의 3차원 모델에 대한 정적 구조해석으로 응력 값을 확인하여 안전함을 확인하였고, 또한 대칭 구조인 부분에 대해 2차원 단순 모델의 구조해석으로 같은 결과가 도출됨을 확인하였다. 본 연구의 범위는 볼의 중량 감소라 볼의 감소된 치수가 도출되었으며, 주변 부재의 재설계는 (신제품 개발에 해당되어) 본 연구에 고려되지 않는다.

Keywords

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