A check valve comprising: a valve housing defining an opening a valve housing sealing surface surrounding the opening ; a plurality of flapper elements , each flapper element being pivotally mounted to the valve housing about a respective axis transverse to the opening , for rotation between an open position in which the flapper elements permit flow of fluid through the opening and a closed position in which they block the flow of fluid through the opening ; each flapper element comprising: a first side facing the valve housing sealing surface in the closed position; a second side , opposed to the first side and facing away from the valve housing sealing surface in the closed position; a base end , the flapper element being mounted to the valve housing at its base end ; a first edge sealing region extending away from the base end for sealing engagement with the valve housing sealing surface in the closed position of the flapper element ; and a second edge sealing region extending away from the base end for sealing engagement with the base end of an adjacent flapper element in the closed position of the flapper element , wherein an edge of the second edge sealing region of the flapper element engages with the second side of an adjacent flapper element when the flapper elements are in the open position, wherein the base end of each flapper element comprises a sealing surface along an edge region thereof on the first side of the flapper element for sealing engagement with the second side of the adjacent flapper element in the second edge sealing region thereof, characterised in that said base end further comprises an inclined ramp surface joining said base end sealing surface to a main body portion of the flapper element . a valve housing defining an opening a valve housing sealing surface surrounding the opening ; a plurality of flapper elements , each flapper element being pivotally mounted to the valve housing about a respective axis transverse to the opening , for rotation between an open position in which the flapper elements permit flow of fluid through the opening and a closed position in which they block the flow of fluid through the opening ; a first side facing the valve housing sealing surface in the closed position; a second side , opposed to the first side and facing away from the valve housing sealing surface in the closed position; a base end , the flapper element being mounted to the valve housing at its base end ; a first edge sealing region extending away from the base end for sealing engagement with the valve housing sealing surface in the closed position of the flapper element ; and a second edge sealing region extending away from the base end for sealing engagement with the base end of an adjacent flapper element in the closed position of the flapper element , wherein an edge of the second edge sealing region of the flapper element engages with the second side of an adjacent flapper element when the flapper elements are in the open position, wherein the base end of each flapper element comprises a sealing surface along an edge region thereof on the first side of the flapper element for sealing engagement with the second side of the adjacent flapper element in the second edge sealing region thereof, characterised in that said base end further comprises an inclined ramp surface joining said base end sealing surface to a main body portion of the flapper element . <EOS>