Abstract：Stuck malfunction occurred in an inlet hydraulic gate valve is investigated. The structural characteristics of the gate valve are briefly explained and the potential factors causing the stuck malfunction are examined. Based on pressure fluctuation features of the marine hydraulic pressure drive, the opening and closing characteristics of the gate valve are calculated and analysed. The validity of the design is substantiated with the obtained opening and closing characteristic curve associated with fluctuating pressure. The dimensions of the gate valve parts are examined and the most pivotal dimension influencing the opening and closing characteristics of the gate valve is extracted. The test stand simulating a practical ship system is built and the stuck malfunction of the gate valve is reproduced thereby. The gate valve operates well as the pivotal dimension is appropriately controlled, and the fidelity of the results obtained through the employed calculation, adapting to the pressure environment of ship fluc tuation, and analysis methods is confirmed as well.
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