• 1. Reduction sleeve: 变径套
• 2. local reduction valve sleeve: 局减阀套

• 1.The circular boundary between the reduction sleeve 2 and the filter body 3 are welded.
  过渡套2与过滤体3之间外圆分界线焊接连接。
  dict.yoduao.com
• 2.The circular boundary between the positioning sleeve 1 and the reduction sleeve 2 are welded.
  定位套1与过渡套2之间外圆的分界线焊接连接。
  dict.yoduao.com

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