トンネル形凸部を持つ低壊食性バタフライ弁の締切側における壊食の抑制効果

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  • Suppression of Cavitation Erosion on a Low-Erosion Butterfly Valve with a Tunnel-Type Buffer.
  • トンネルケイ トツブ オ モツ テイ カイショクセイ バタフライベン ノ シメ

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In order to improve the reliability of butterfly valves, it is absolutely imperative to prevent fatal cavitation erosion. In our previous studies, we developed a new butterfly valve with a tunnel-type buffer, and showed that it was effective in suppressing cavitation erosion on a specific valve opening when the erosive vortex cavitation occurred predominantly on a typical valve. Practically speaking, when the valve is operated near valve closure, erosion is an especially big problem. In this paper, therefore, the cavitation shock pressures and the highly erosive vortex cavitation arising around the butterfly valve with the tunnel-type buffer are compared with a typical valve counterpart by means of pressure-sensitive films and high-speed photography. It is found that the tunnel-type buffer is also useful in preventing erosion near valve closure.

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