pipe union的用法和樣例：
例句
- This permits fouled valve replacement with a new body cartridge, which will fit the old union nuts.
這使得骯臟的閥門(mén)更換件可以配置新的閥體，并且可以與舊的管接螺母相配套。 - Slide the union nuts over the end connectors and screw onto the valve cartridge threads, no more than handtight.
將管接螺母移到端口連接件上，并且將螺紋套在閥腔的螺紋上，感到手緊后就停止。
