因为他们受到的天气和水，确保您的景观灯光设计只使用天气密封户外使用而设计单位。
Because they are exposed to weather and water, make sure your landscape lighting designer USES only weather-sealed units designed for outdoor use.
两侧都经过精密光亮磨光的刀片确保填料腔的气密性密封。闸板的密封面经过研磨，以提供最好的阀座密封性。
Precision ground blade on both sides for tighter packing chamber sealing. Sealing face of the gate is lapped to provide the best possible seat tightness.
介绍干气密封的结构、工作原理、优越性，以及在离心泵轴封领域的应用情况和前景。
The paper introduces the structure, working principle, advantage of gas seal in centrifugal pump and its application and prospect.
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