Apply pipe dope sparingly on pipe threads, never on valve threads.

在管道螺纹上涂敷螺纹油，但是不要在阀门螺纹上涂螺纹油。

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Apply pipe dope sparingly on pipe threads, never on valve threads.

阀杆上的短梯形螺纹适用于快速启闭操作。

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Both have the same pitch diameter at the top of the hole of internal threads or end of the pipe on external threads, and both have the same thread lengths or depths.

在内螺纹的孔的顶端或者外螺纹的管的端部拥有相同的中径，而且拥有相同的螺纹长度和深度。

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