A method and a regulating valve for maintaining a fluid pressure within a defined volume, and simultaneous registering of discharge of fluid from the volume as a result of leakage or consumption. The image display apparatus includes a video input device that receives a video signal, a video display that displays an optical image based on an input signal S1 from the video input device, and a video signal adjusting device that adjusts the display setting of the video display based on a signal mode of the input signal S1. If the receiving station detects and reacts to the in-band signals, then both stations can pass control information and data as well as enhancements between each other, without any need of infrastructure upgrade andor quality compromise to legacy phone users. The antenna element is electrically coupled with the electrically conductive layer across the opening end via a matching circuit, and receives an electric power through one end of the antenna element. The invention is further characterized in that when said base section is rotated to a disk playing position, said engaged section is adapted to engage with said engaging section. A high-pressure fuel pump feeds the liquid fuelgas solution into a common rail and further into fuel injectors, providing a pressure P4 higher than a pressure P5 in the combustion chamber at a moment of combustion.