From the view of flow control, the method of cavitation resistance of a pilot-operated water hydraulic valve was investigated.

从流场控制的角度，研究了先导式纯水溢流阀抑制汽蚀方法。

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Here is the port side view of the aft ballast tank showing a closer view of the vent valve and tubing.

这里是港口方面鉴于对尾部压载水舱展示了更紧密的看法通风口的阀门和油管。

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Finally, the proportional electro-pneumatic changeover valve is designed, keeping in view the domestic technology and production capability.

最后结合我国现有的技术特点和工艺、生产能力，完成了比例电空阀的设计。

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Walters will have surgery later this week to replace a faulty heart valve, and will take the summer off from The View talk show to recuperate.

BBC: Barbara Walters

Broadcast journalist Barbara Walters announced this week on The View that she would be leaving to undergo a heart surgery, which would replace a faulty heart valve.

FORBES: Not Even Heart Surgery Stops Barbara Walters