• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2010년도 춘계학술대회
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• pp.415-416
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• 2010

최근 석유수급에 대한 불안함이 증가되고 있으며 그로 인해 천연가스의 개발과 사용범위가 확대되고 있다. 특히, 전 세계적으로 조선에서는 LNG 및 LPG와 같은 천연가스의 저장과 운반에 대한 발전이 급속도로 성장하고 있는 반면에, 국내에서는 극저온 부품소재의 기술력 저하로 극저온 버터플라이 밸브와 같은 핵심부품을 전량 수입에 의존하고 있는 실정이다. LNG 및 LPG 둥은 미래 핵심 천연연료로 많은 지지를 얻고 있고 사용빈도도 증가하고 있기 때문에 이와 관련된 기술이 발전되어야 함은 물론이고, 국내에서도 극저온 버터플라이 밸브 제작과 설계에 대한 핵심기술을 확보하여야 한다. 이러한 관점에서 본 논문에서는 극저온 환경 하에서 우수한 신뢰성과 안전성이 보장될 수 있는 원주가압형 극저온 버터플라이 밸브를 유동-구조 연성해석을 이용하여 밸브 가압 길이에 따른 강도 평가를 수행하였다.

• Journal of Advanced Marine Engineering and Technology
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• 제32권6호
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• pp.923-930
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• 2008

The butterfly valve is widely used in the industrial field as an on-off or a flow control valve. When the butterfly valve is used as a flow control valve. cavitation sometimes occurs in the range of high flow rate because of the small valve opening. Therefore. the pressure loss and the cavitation characteristics are investigated by use of a commercial CFD code. The results show that the possibility of cavitation occurrence in the cryogenic butterfly valve is very high in the case of valve opening angle below 10 degree and incident velocity over 6m/s. By increasing the inlet velocity at 10 degree of valve opening angle. the value of loss coefficient increased. However. by increasing the inlet velocity at 50 degree of valve opening angle. the value of loss coefficient decreased.

• 한국유체기계학회 논문집
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• 제11권2호
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• pp.20-28
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• 2008

Recently, butterfly valves are used as control valves for industrial process. However, there are not so many reports on cryogenic butterfly valves in spite of broad application in LNG storage station and LNG carriers. Present study is focused on the investigation of the detailed hydrodynamic and aerodynamic characteristics of cryogenic butterfly valves to contribute to the operation during the handling on LNG transportation system, and to the practical utilization in design of butterfly valves and actuators. The results show that large recirculation vortices in the region downstream of the valve are founded and the cavitation flows are intensively generated on the surface of valve disc at the relatively small opening angle. The aerodynamic characteristics, lift, drag and torque, acting on the valve disc are calculated. The pressure distribution and the pressure loss coefficient of the cryogenic butterfly valve show almost similar pattern with those of the butterfly valve which is used on the normal temperature.

• 대한조선학회논문집
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• 제43권5호
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• pp.611-618
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• 2006

Recently, cryogenic butterfly valves for LNG carriers are actively developed by ship equipment companies. The dual core structure unlike usual butterfly valve has both translation and gyration motions of the disk of the valve assembly. Especially, the ship equipment companies can not have overcome 2D design method; in addition, even though 2 years of development has passed, the drawing cannot be secured. In this research, for the cryogenic butterfly valves and the product design, 3D design method was introduced and DMU(Digital Mockup) was applied to complement the problems in 2D design and investigate application possibility of 3D design method.

• 한국기계가공학회지
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• 제7권4호
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• pp.76-81
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• 2008

A cryogenic butterfly valve is used to transfer the liquefied natural gas (LNG) which temperature is $-162^{\circ}C$. This valve is core part in the piping system using LNG. This paper performed coupling analysis using FEM to evaluate safety of cryogenic butterfly valve. Flow analysis is calculated numerically the CAE and CFD methods are useful to predict the thermal matter and the inner flow field of the valve. Thermal analysis and structural analysis used ANSYS Workbench.