The utility model discloses a flanged connectors, including first flange, through a bolt and a flange joint's second flange in opposite directions, be equipped with the sealing washer between first flange and the second flange, be equipped with the seal groove that corresponds with the sealing washer on the sealed face of first flange and the sealed face of second flange respectively, the sealing washer inlays in the seal groove and paste tightly with the lateral wall cooperation of seal groove to form the sealed of sealed face, set up the first through -hole towards the seal groove bottom on the sealing washer, seted up on the second flange and link up the passageway, link up the bottom that the passageway communicates the seal groove of the outside of second flange and second flange to it communicates with each other with first through -hole to link up the passageway. Implement the technical scheme of the utility model, when satisfying sealed the requirement, be convenient for detect the encapsulated situation of sealing washer to the be convenient for alignment and the connection of pipeline.