与机械通风式凉水塔的冷却效果比较表明，该凉水塔具有冷却效率高、运行成本低、操作简单等优点，值得推广应用。
The results show that this kind of hydraulic spray type is worthy to be spread, with advantages of high efficiency, low cost, easy operation, and so on.
该阀采用环空外压操作测试阀的开关，不需要保压，而且采用简单的机械压力平衡机构代替了专用计量套。
Without keeping annulus pressure to static and instead of special metering by simple mechanical pressure ba lance structure, this valve is conducted by annulus pressure.
本文提出的机械测量仪设计方案，经试制具有精度高，体积小，结构简单，操作和携带方便、无振动和噪声的优点。
This paper provide a new design, it has high accuracy, small volume, simple structure, easy operating and bring and no vibration and noise.
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