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            閥門
            (油田高壓止回閥H42H)油田專用超高壓止回閥正常處于關閉狀態,由于管線中進口端介質的壓力作用,而克服彈簧阻力使閥門開啟。當進口端介質壓力低于出口端時,彈簧將閥芯推向閥芯而使閥門關閉,阻止介質逆流,起止回作用.
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