Abstract: A docking port is for an unmanned aerial vehicle being a rotorcraft, said docking port having at least one primary coil. The docking port has a primary coil housing formed with a funnel shaped indentation adapted to receive a complementary frustoconical shaped external surface of a secondary coil housing positioned on a landing gear of the rotorcraft, and the primary coil is formed to follow closely a funnel shaped indentation surface. The rotorcraft is charged wirelessly by the primary coil in the primary coil housing and a secondary coil in the secondary coil housing. The invention further concerns the landing gear and a system comprising the docking port and the landing gear. A method for docking the unmanned aerial vehicle on the docking port by use of a magnetic homing field is described.

Abstract: A valve assembly comprises a hot stab and a complementary connection block. The hot stab and the connection block are each provided with a pressure balanced rotating sleeve. When the hot stab is disconnected from the connection block, the rotating sleeve is in a closed position and fluid is not allowed to flow through the :hot stab. The rotating sleeve of the connection block is also in a closed position such that fluid is not allowed to flow through the connection block. The hot stab may be connected and disconnected to the connection block without reducing the fluid pressure.

Abstract: A device for a valve has a fixed part provided with at least one fluid port and a rotatable sleeve provided with at least one bore. The sleeve is structured in a manner allowing it to rotate the bore in-line with the fluid port in order to allow a fluid to flow through the fluid port and the bore when the sleeve is in an open position. The sleeve is structured in a manner allowing it to rotate the bore away from the fluid port in order not to allow a fluid to flow through the fluid port when the sleeve is in a closed position. The fixed part and the sleeve form an annulus between the fixed part and the sleeve. The annulus is restricted axially by two packer elements in the axial directions of the sleeve and the fixed part, wherein one of the two packer elements is located at one side of the fluid port, and the other of the two packer elements is located at the opposite side of the fluid port, and wherein the annulus is in fluid communication with the fluid port of the fixed part.