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丹富斯DFH42Y、DFH42W 型升降立式止回閥正常處于關閉狀態(tài)，由于管線中端介質(zhì)的壓力作用，而克服彈簧阻力使閥門開啟。當端介質(zhì)壓力低于出口端時，彈簧將閥芯推向閥座而使閥門關閉，阻止介質(zhì)逆流，故起止回作用。
Dan fuss DFH42Y, DFH42W te vertical lifting check valve normally closed, due to the pressure of the inlet medium in the pipeline, and to overcome the spring resistance makes the valve opens. When the inlet pressure of medium below the outlet, the spring into the valve core seat and make the valve closed, s medium counter-current, start-s function back.
