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    3. 閥門
      J/L66Y平衡式節流閥閥瓣通過閥桿壓板和閥桿連接,該閥為節流、截止。順時針方向旋轉手柄,閥桿向下移動,推動閥瓣向下移動,逐步地縮小閥座與閥瓣上的開口通道面積,以此達到減少流體流量和節流降壓的目的。逆時針方向旋轉手柄時則相反.