，均是在英國使用最先進(jìn)的生產(chǎn)設(shè)施。
大間隙密封備有金屬備份，沒有刀口密封，以防止閥門粘連問題
。
干電樞，以防止電樞腐蝕而影響閥安全關(guān)閉。
維護(hù)簡易，可拆抑制二級管和線圈，無需從管道把閥門拆除。
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