Patent attributes
A coupling member is disclosed which includes a valve device that is axially movable between an open position and a closed position where the valve device closes an annular valve opening defined an outer valve seat portion and an inner valve seat portion. The valve device includes an outer annular sealing member and an inner annular sealing member. The inner annular sealing member includes an annular extending portion configured such that, when the valve device approaches the closed position, the annular extending portion sealingly engages the inner valve seat portion and is elastically bent to allow the valve device advance further to the closed position so that the outer annular sealing member positively engages the outer valve seat portion.
