简体中文标题：法兰及其连接件。等级标示的管、阀门、配件和附件用环形法兰.NPS 1/2到24 钢法兰。

English Name:Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, class-designated - Steel flanges, NPS 1/2 to 24

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颜色的深浅表示不同的等级：最深的红色表示最低水平，最深的蓝色标示最高水平。

The darkness of the color indicates the ranking: the darkest red marks the lowest value, the darkest blue the highest.

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量是质的存在方式，是质的规模和等级的标示。

Quantity, as a way of existence of quality, marks both extent and degree of quality.

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