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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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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In view of the operation situation of valve-control sealed battery in power system, some practical maintenance methods are presented in this paper and their feasibility is discussed.

针对阀控密封式铅酸蓄电池在电力系统的使用情况，介绍了几种实用的维护方法，并进行了可行性探讨。

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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