Valve for a pressurised fluid cylinder comprising a body featuring an end configured to be mounted in an orifice of the cylinder, the valve body housing at least one extraction circuit (3, 11) comprising a first upstream end configured to transfer the storage volume of a pressurised fluid cylinder and a second downstream end configured to be connected to an extracted gas-using member, said at least first circuit (3, 11) comprising an isolation member used to open or close said extraction circuit (3, 11), the valve comprising an electronic device displaying data relating to the fluid content of a cylinder connected to the valve, the electronic display comprising a data acquisition, storage and processing unit and at least one data display connected to the data acquisition, storage and processing unit, the valve further comprising a pressure sensor configured to measure the pressure of the storage volume inside a fluid cylinder connected to the valve, the pressure sensor being connected to the data acquisition, storage and processing unit whereto it is configured to transmit a signal reflecting the measured fluid pressure, characterised in that the data acquisition, storage and processing unit is configured to measure the variation of the signal reflecting the fluid pressure based on the signal provided by the pressure sensor and to compare this measured signal variation with a predetermined extraction threshold and, when the variation of the signal reflecting the pressure of the fluid measured by the pressure sensor exceeds the predetermined extraction threshold, the data acquisition, storage and processing unit is configured to detect the start of a gas extraction process and, in response, to show on the display at least one information relating to said extraction, the start of which was detected by the pressure sensor, and in that, when the variation of the signal reflecting the fluid pressure measured by the pressure sensor exceeds said extraction threshold, the data acquisition, storage and processing unit is configured to detect, based on the signal of the pressure sensor, at least one characteristic of the variation rate of the fluid pressure inside the cylinder owing to the extraction, said characteristic of the rate of fluid pressure variation comprising at least one of the following: a periodic nature of the pressure variation or of the quantity variation, the frequency of the pressure variation or quantity, an average of the pressure measurements, the maximum and minimum values of the pressure measurements and an average or instantaneous value of the pressure variation, and in that the data acquisition, storage and processing unit is configured to compare at least one characteristic of the detected rate of the pressure variation with a characteristic of the determined rate of pressure variation, and when the absolute value difference between said detected characteristic and the determined characteristic is below a predetermined threshold, to detect an extraction corresponding to the fluid supply to a medical ventilator and to show on a display at least one corresponding information relating to the supply of fluid to a medical ventilator.