a and 4 b a principle view is illustrated of an alternative embodiment of a flange portion for a valve according to the invention the valve 1 which may be similar to that in fig1 has an alternative flange portion 2 the flange portion 2 has a main channel 4 and a bore 6 extending from an outside to the main channel 4 in the flange portion in this bore 6 parts 14 15 of a control unit are mounted for a valve which has to be placed in an outlet bore 50 of a wellhead christmas tree 5 to which the valve 1 is to be secured the parts comprise a piston unit 14 which is mounted in the bore 6 where a first mechanical actuation part 15 is secured to this piston unit 14 by pressurising the piston 14 for example hydraulically from the outside of the flange portion 2 it will be moved towards the main bore 6 whereupon the first actuation part 15 is moved from a position outside the main channel 4 to a position partly internally in the main channel 4 in this position it can interact with a second actuation part 16 located in the main channel 4 and extending in the longitudinal direction thereof by interacting with the first actuation part 15 the second actuation part 16 is moved in the longitudinal direction of the main channel 4 and by means of.