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http://dx.doi.org/10.21289/KSIC.2022.25.1.131

A Study on Reduction of Cavitation with Orifice on High Differential Pressure Control Butterfly Valve  

Lee, Sang-Beom (Ship and Ocean R&D Institute, Daewoo Shipbuilding & Marine Engineering Co. Ltd.)
Publication Information
Journal of the Korean Society of Industry Convergence / v.25, no.1, 2022 , pp. 131-139 More about this Journal
Abstract
The exchange of goods over the sea is a situation in which the amount of trade between countries is gradually increasing. In order to maintain the optimal operating condition, the ship maintains stability and optimal operating conditions by inserting or withdrawing ballast water from the ballast tank according to the loading condition of cargo capacity is also increasing. Control valves play an important role in controlling fluid flow in these pipes. When the flow rate is controlled using a control valve, problems such as cavitation, flashing, and suffocating flow may occur due to high differential pressure, and in particular, damage to valves and pipes due to cavitation is a major problem. Therefore, in this study, the cavitation phenomenon is reduced by installing orifices at the front and rear ends of the high differential pressure control butterfly valve to reduce the sudden pressure drop at the limiting part of the butterfly valve step by step. The flow coefficient according to the shape of the orifice, the degree of cavitation occurrence, and the correlation were analyzed using a CFD(Cumputational Fluid Dynamics), and an optimal orifice design for reducing cavitation is derived.
Keywords
Orifice; Cavitation; High Differential Pressure; Butterfly Valve; Control Valve;
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