• 기술사
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• 제30권3호
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• pp.104-114
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• 1997

Throughout the practical process engineering design and commissioning 8E startup experiences focused on chemical process safety, the review of design and installation of the thermal relief valve with its surrounding facility in a chemical plant piping system is made to help the better understanding of the piping system of characteristics of thermal relief valve which Is consisting of theoretical approach, correlation in terms of temperature and pressure increase caused by external heat supply in a piping system, consideration of thermal relief valve design, pressure relieving system of serial thermal relief valves and exception of their installation. It is earnestly recommended that following topic should be implemented during thermal relief valve design, installation and normal operation as well.

• 대한안전경영과학회지
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• 제8권4호
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• pp.39-51
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• 2006

Based on the practical process engineering design and commissioning and startup operation experiences focused on chemical process safety, the comprehensive review of engineering design and installation of the thermal relief valve with its surrounding facility in a chemical plant piping system is provided to enhance the better understanding of the piping system of characteristics of thermal relief valve which is comprised of the theoretical approach, correlation in terms of temperature and pressure increase caused by external heat supply in a piping system, consideration of thermal relief valve engineering design, pressure relieving system of serial thermal relief valves and exception of their installation. It is earnestly suggested that following topic should be implemented during thermal relief valve engineering design, installation and normal operation as well.

• 대한기계학회논문집
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• 제1권2호
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• pp.65-72
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• 1977

Major problems in the design and use of refief valve are (a) chattering because of instability, (b) excessive pressure differential which makes the valves crack far below maximum pressure diminishing useful flow in the system. In this study, A magnet-coupled relief valve is investigated theoretically and experimentally in order to improve the performance of a conventional direct type reliefvalve. A theory is developed to predict the performance, response, and stability of the magnet-coupled valve taking into account the delivery line response. In the experiment, a typical magnet-coupled relief valve is designed on the basis of the analytical results; the discharge rates are measured varying the supply pressure, and both the pressure-time curves and valve displacament-time curves are recorded providing the supply pressures greater than the setting pressure. The measured override characteristic curves are then compared with those of conventional pilot type and direct type releif valves. It is showm that the excessive pressure differential of a magnet-coupled relief valve becomes less than that of a conventional direct type valve. It is also shown that the most important chatacteristic of a magnet-coupled relief valve is to eliminate valve chattering due to instability regardless of the magnitude of setting pressures and discharge rates, which suggests wide applications of the idea of the use of a magnet in the design of hydraulic valves.

• 한국생산제조학회지
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• 제25권3호
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• pp.171-176
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• 2016

Growing concerns about air pollution have led to increased demand for liquefied natural gas (LNG)-fuelled ships that have crankcases equipped with explosion relief valves to relieve excessive crankcase pressures and stop the flames emitted from the crankcase. The results of a computational fluid dynamics (CFD)-based feasibility analysis of the crankcase relief valve flame arrester design conducted using ANSYS CFX V14 showed that the inlet and outlet relief valve temperatures differed by $350-700^{\circ}C$. An explosion test was performed based on European standard EN14797 to evaluate the flame transmission and mechanical integrity of the valve. No flame transmission from the pressure vessel to the exterior was detected, and the mechanical integrity of the valve was confirmed. Thus, the relief valve components were found to be safe from the viewpoint of fracture.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 춘계학술대회
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• pp.629-636
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• 2003

The purpose of this study is localization of safety relief valves for Nuclear Service through technical development with overall design, fabrication, inspection, capacity certification test and functional qualification test of safety relief valves in accordance with ASME Section III and KEPIC Code. Safety relief valve is the important equipment used to protect the pressure vessel, the steam generator and the other pressure facility from overpressure by discharging the operating medium when the pressure of system is reaching the design pressure of the system. But we're depending on technology of the other country up to the present time. Because we don‘ have our own technologies, we have been spent the great time and money on installing and repairing safety relief valve at nuclear power plant. Therefore we have to achieve the development of safety relief valves for Nuclear Service with our own technologies.

• 한국가스학회지
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• 제4권1호
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• pp.63-68
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• 2000

가정용 가스보일러의 안전장치인 새로운 과압방지밸브를 개발하였다. 본 과압방지밸브는 방출용량을 고려하여 입출구의 구경과 시트구경을 확대하였고, 스프링과 난방수가 닿지 않는 밀봉구조로 설계하여 기존 과압방지밸브의 문제점인 입구유로의 고착, 막힘이나 스프링의 부식현상을 최소화하였다. 개발된 과압방지밸브는 시험결과 분출개시압력, 분출정지압력, 밀폐성, 내구성의 성능특성이 우수하였고, 보일러 설치후의 작동성도 우수한 것으로 평가되었다. 본 연구결과를 통한 과압방지밸브의 표준화와 적용은 부품호환뿐만 아니라 유지보수가 용이하다는 장점을 제공할 수 있을 것이다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2009년도 추계학술대회 논문집
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• pp.267-268
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• 2009

• 항공우주기술
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• 제11권2호
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• pp.109-116
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• 2012

우주발사체의 액체추진공급시스템에서 사용되는 연료 벤트/릴리프밸브는 안전밸브의 조합체로 지상에서 연료를 주입할 때와 비행 중에 추진제 탱크의 과압을 해소하는 역할을 한다. 벤트/릴리프밸브는 구동가스 공급에 의해 벤트밸브를 작동시키는 벤트모드와 설정된 압력을 유지하기 위해 자동으로 밸브를 개폐하는 릴리프모드로 작동한다. 본 논문에서는 해외발사체에 사용된(Saturn) 벤트/릴리프밸브 샘플을 이용하여 한국형발사체의 규격에 적용한 밸브 설계를 검토하였다. 또한 설계 검증 및 기본적인 작동 특성을 분석하기 위해 AMESim 상용코드를 이용하여 해석 모델을 구성하였다. 밸브 모델을 이용해서 동특성 해석을 수행하여 설계 변수에 대해 밸브 개폐 작동시간, 작동성능, 개폐압력을 예상하였다. 이를 통해 연료 벤트/릴리프밸브 설계변수에 따른 작동성을 파악하여 시제품 제작 전 의 상세설계 및 설계 경계조건을 제시하였다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.508-511
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• 2008

The most landing gear use oleo-pneumatic shock strut to absorb the impact energy during touchdown. The shock strut is composed of the oil damper and the gas spring, especially the oil damper provides resistance force which is proportional to the square of landing speed. In case of high landing speed, the abnormal peak load can be occurred and transferred to the airframe structure. To prevent this, the pressure-relief valve is used to limit the damping force under the specific level. In this paper, it is presented the design process to find optimal damping and analysis results using pressure-relief valve.

• 한국유체기계학회 논문집
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• 제12권1호
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• pp.16-21
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• 2009

In the last five years, 91 accidents from portable gas ranges and non-refillable metallic gas cartridges have occurred. The gas cylinder installed with a relief valve was developed to prevent an explosive accident from the gas cartridge. In this study it was carried out to evaluate the safety of a gas cylinder mounted with a relief valve which can prevent an explosion. Under the real using condition and the extreme condition the gas cylinder is heated with an electric heater. Simultaneously, the operating pressure is checked and the suitability of releasing flux is evaluated. And the possibility of fire or explosion was tested when the gas was released from the relief valve at the real using condition. Using a numerical simulation method, the diffusion of butane gas released from a relief valve was visualized.