管件就是将管材联接成管路的零件，根据连接方法可分为承插式管件、螺纹管件、法兰管件和焊接管件。
◆ 常见管件：弯头、直通、三通、四通、异径管、截止阀、管帽、球阀。
◆材质：管件多为与管子相同的材料制成。
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