• 제목/요약/키워드: Ball valve

검색결과 111건 처리시간 0.03초

밸브 형식별 유량제어범위 결정에 관한 연구 (Study of Flow Control Range according to Valve Type)

  • 박종호;박한영
    • 한국유체기계학회 논문집
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    • 제14권5호
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    • pp.39-47
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    • 2011
  • Flow control range of valve, which is installed on pipeline, varies according to valve type, pipe diameter, pipe length, roughness, and elevation difference of both ends of pipeline. A lot of computation efforts and knowledge are needed to estimate flow control range of valve, considering above many parameters. The table of flow control range of each valve type is presented for convenience of pipeline design engineers who must make decision of valve size and type in this study. Also the reason that butterfly valve is recommended for flow control, and gate valve is forbidden is presented via quantification and figures in this study.

T형 볼밸브 내의 유동특성 해석 및 압력변동의 FFT 분석 (Study on the flow characteristics and FFT analysis to the pressure fluctuation in a T-type ball valve)

  • 여창호;허형석;서용권
    • 한국해양공학회:학술대회논문집
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    • 한국해양공학회 2003년도 춘계학술대회 논문집
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    • pp.240-244
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    • 2003
  • In this paper, we present the CFD and experimental results for flow characteristics as well as pressure fluctuation in a T-type ball valve. In the experiment, flow visualization for the wake is performed with a fluorescent dye. In CFD, the valve flow is simulated three-dimensionally using a commercial fluid analysis code, FLUENT 6.0. FFT analysis to the pressure fluctuation in the wake region is also calculated Analysis results show that the characteristic frequency of the wake flow is strongly dependent on the Reynolds number.

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Cone Type 밸브 내부유동 수치해석에 관한 연구 (A Study on the Numerical Analysis of Internal Flow in a Cone Type Valve)

  • 진도훈
    • 한국산업융합학회 논문집
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    • 제23권2_2호
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    • pp.199-207
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    • 2020
  • These days, many different types of valves are developed in the industrial area according to their use purpose. Multiple kinds of valves are installed to control a flow and pressure of the pipe conveying fluid. Valves serve as critical roles in land plants such as power plants. The performance of equipment varies depending on valve characteristics. In this study, the internal flow analysis on Cone-type valve is conducted to analyze flow field and secure a value of the flow coefficient Cv. According to the internal flow analysis, when the flow distribution of the middle cross-section of valve was open 100%, flow field was relatively and smoothly taken out. If it was open 50%, flow recirculation region increased and a little complex flow field occurred. Unlike ball valve or butterfly valve, this valve had flow recirculation in its outlet depending on a valve opening amount. Therefore, it was found that there was no flow recirculation in the outlet of Cone-type valve.

자동변속기내 체크밸브의 모델링 및 최적화 연구 (A Study on the Modeling and Optimization of Check Valve in Automatic Transmission)

  • 송재수;정우진;김성원
    • 한국자동차공학회논문집
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    • 제5권2호
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    • pp.111-119
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    • 1997
  • The operating characteristics of the check valve in the clutch piston of an automatic transmission have a great effect on the shifting performance. This paper addresses the modeling, dynamic analysis, and optimization of the check valve. It was found that the vortex causes a pressure drop, which is related to the rotating speed of the clutch piston, oil volume discharged from the check valve, and valve geometry. Maximizing the oil volume discharged, geometry of the check valve is optimized. The results can be used to design an improved check valve which provides a suitable oil pressure curves for achieving smoother shifting.

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독립공리를 이용한 메인 스타팅 밸브의 분석 및 설계 (Analysis and Design of a Main Starting Valve Using Independence Axiom)

  • 배태성;박수철;박상일;이권희
    • 한국기계가공학회지
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    • 제9권5호
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    • pp.7-13
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    • 2010
  • Main starting valve is one of the main parts in the control system of diesel engines, purposed for starting main engines. It is composed of ball valve, check valve, actuator, etc. The design axioms provide a general framework for design methodology. Two axioms are independence axiom and information axiom. These axioms can be applied to all design process in a general way. The first axiom is introduced to analyze and evaluate the design of a main starting valve. The design parameters(DPS) are determined sequentially by considering the independence axiom. For the structural design of a main starting valve, the strength is calculated by using finite element method. In addition, the strength of its actuator piston is evaluated.

수소 압축기용 릴리프 밸브 모델링 및 성능해석에 관한 연구 (A Study on the Relief Valve Modeling and Performance Analysis of Hydrogen Compressor)

  • 박상법;김규보;전충환;윤소남;권병수
    • 한국수소및신에너지학회논문집
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    • 제20권3호
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    • pp.179-187
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    • 2009
  • This paper presents a static and dynamic characteristics of the relief valve which is a kind of direct operated pressure control valve for hydrogen compressor. The valve is consisted of a main poppet, a spring, an adjuster and a valve body. The purpose of this study is development of the simulation model for relief valve by using commercial AMESlM$^{(R)}$ tool. Poppet with sharp edge seat type and ball poppet with sharp edge seat type compare for P-Q characteristic. The dynamic simulation results are presented the operating pressure characteristics of relief valve. High pressure power unit of which maximum pressure control range is 100MPa was manufactured, and the pressure control valve was experimented using the above-mentioned power unit. The new model of pressure control valve from this results was suggested. It was confirmed that the suggested valve has a good control performance from experimental setup.

건축배관시스템 내에서의 수격현상에 관한 실험적 연구 (A Study on Water Hammer Phenomena in Piping Systems of Buildings)

  • 한화택;김종만;김종필
    • 대한기계학회논문집
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    • 제18권9호
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    • pp.2251-2256
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    • 1994
  • An experimental study was conducted on water hammer phenomena generated by quick valve operations in piping systems of buildings. Transient water hammer pressure waves were measured for three different types of valves, i. e. a ball valve, a solenoid valve, and on one-touch valve. The effects of flow rate and valve closing time on the maximum water hammer pressure were investigated. Based on the experimental results, general design recommendations were provided to prevent water hammer phenomena in piping systems of high-rise apartment buildings.

볼밸브용 볼의 로봇 육성용접시스템에서 포지셔너의 설계 및 구조강도해석에 관한 연구 (A study on design and structural strength analysis of positioner in robot overlay welding system of ball for ball-valve)

  • 이종환;노태정
    • 한국산학기술학회논문지
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    • 제16권3호
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    • pp.1639-1644
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    • 2015
  • 볼밸브용 볼의 로봇 육성용접시스템에서 포지셔너의 설계 및 구조강도 해석에 관한 연구를 하였다. 포지셔너의 일부분인 터닝 유닛을 모델링하였고, 보로 가정하여 해석을 진행하였다. 볼의 무게가 $9,000kg_f$ 일 때 터닝 유닛에 가해지는 응력이 366.85MPa로 나왔다. 이 값은 재료의 항복강도보다 높은 값이다. 앞의 결과를 토대로 터닝 유닛을 수정하여 모델링을 하였다. 수정된 모델링으로 해석한 결과, 응력의 값은 296.11MPa로 확인되었다. 이 값은 재료의 항복강도보다 낮은 수치이며, 볼의 무게를 버티는 것을 알 수 있었다.

좌심방의 자유 부유 구혈전 -1예 보고 - (Free-Floating Ball Thrombus in the Left Atrium -A case report -)

  • 김혁;남승혁;김영학;강정호;정원상
    • Journal of Chest Surgery
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    • 제38권9호
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    • pp.644-647
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    • 2005
  • 좌심방의 자유 부유 구혈전은 매우 드물며, 치명적인 전신성 색전증이나 혹은 좌심실 유입구의 폐쇄로 드물게 급사를 초래한다. 저자들은 7년 전에 기계판막으로 승모판대치술을 시행 받은 환자에서 크고, 자유 부유하는 좌심방의 구혈전을 경험하였기에 보고하는 바이다.

화재 안전용 볼밸브의 열·구조 연성해석 (Thermal-structural Coupled Field Analysis for Fire Safety Type Ball Valve)

  • 김시범;이준호;이권희;전락원;도태완
    • 한국기계가공학회지
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    • 제10권3호
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    • pp.28-32
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    • 2011
  • The safety of transporting equipment in a cryogenic condition is one of important problems under the circumstances that the application weight of natural gas is gradually increasing. As a larger disaster may be generated by leakage of oil or gas from valves in case of fire occurrence of a ship, the present research applied a numerical analysis method on thermal stress distribution and deformation, etc. to the design of ball valves satisfying fire safety test's specification(API607) to prevent this. In addition, the present research progressed fire safety tests and compared the test result with numerical analysis results. The Max stress by parts was confirmed through thermal analysis of major parts to evaluate safety. The fire safety test was progressed according to the regulation of API607.