The invention relates to a barrier valve for creating a fluid tight barrier in a well during the installation of completion equipment. The barrier valve includes a housing having a longitudinal direction for being installed in a tubular string. A hinged curved, substantially circular valve flapper is disposed in the housing. The valve flapper has a normally closed position for forming a fluid tight barrier between the inlet side of the housing and the outlet side of the housing. The valve flapper is configured for forming a fluid tight barrier in two directions, i.e. both in an upstream direction and in a downstream direction. A pressure actuated valve flapper actuator is configured for bringing the valve flapper from the closed position to an open position after a predetermined number of pressure increases. Also described is a method for opening a fluid tight barrier valve in a well, as well as a tubular part having a zigzag recess.
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