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RISS 인기검색어
- 검색키워드
- 저자 : 정석규(Suk-Kyu Chung) (검색결과 1 건)
- 무료
- 기관 내 무료
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오상권(Sang-Gweon Oh),정석규(Suk-Kyu Chung),김경구(Kyung-Gue Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
The conventional control valves have been used at the locations occurring high differential pressure which causes cavitation, flashing, severe vibration due to abrupt flow change, and sudden pressure drop. These kinds of undesirable symptoms lead to uncontrollable flow rate, and damage of valve trim. To increase the thermal efficiency of power plant and to extend the life of control valves, the conventional control valves are required to be replaced or modified. Previous studies concerning control valves focused to prevent damage of valve trim due to the internal leak and low flow rate. In this study, a multi-cage valve is designed for the purpose of solving the afore-mentioned problems, and evaluated the flow characteristics. The loss coefficients are investigated by designing the number of cage holes and reynolds numbers. Since the loss coefficient has no variation according to the value of reynolds number in the region of high reynolds number, a constant value of the loss coefficient can be applied to the design of the valve cage. The number of holes each cage and the height of the cage fin have been determined by a theoretical analysis and a series of. experiments. The newly designed control valve has been installed at the location of high pressure change in a power plant, and operated for evaluation. It is confirmed that the new control valve developed in this study generates satisfactory performance in comparison with previous control valves.
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