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The invention relates to a pressurized fluid cylinder, a member for acquiring, storing and processing data, and at least one data display device. The valve comprises a sensor which detects the position of a manual control member, and a pressure sensor for measuring the pressure inside the storage sp

The invention relates to a pressurized fluid cylinder, a member for acquiring, storing and processing data, and at least one data display device. The valve comprises a sensor which detects the position of a manual control member, and a pressure sensor for measuring the pressure inside the storage space of a fluid cylinder. The data acquisition, storage and processing member is designed to: calculate an actual value for the amount of fluid remaining and/or drawn off; calculate a theoretical value for the amount of fluid remaining and/or drawn of on the basis of the regulation performed by the regulating member and measured by the position of the control member compare the actual value based on the measurement of the pressure sensor with the theoretical value; and generate a warning signal if the difference between these actual and theoretical values is greater than a specific safety threshold.

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1. A valve for a pressurized fluid cylinder, comprising a body provided with an end configured to be mounted in the orifice of a pressurized fluid cylinder, the body of the valve accommodating a first withdrawing circuit comprising a first, upstream end configured to communicate with the storage vol

1. A valve for a pressurized fluid cylinder, comprising a body provided with an end configured to be mounted in the orifice of a pressurized fluid cylinder, the body of the valve accommodating a first withdrawing circuit comprising a first, upstream end configured to communicate with the storage volume of the pressurized fluid cylinder and a second, downstream end intended to be connected to a consumer of the withdrawn gas, the first withdrawing circuit comprising a member for regulating the flow rate and/or the pressure of the withdrawn fluid between the upstream end and the downstream end, the valve comprising a member for manually controlling the regulating member, the control member being mounted so as to be able to move relative to the body of the valve and cooperating with the regulating member to control the flow rate and/or pressure of fluid allowed to circulate from the upstream end to the downstream end depending on the position of the control member with respect to the body, the valve comprising an electronic device for indicating data relating to the fluid content in the pressurized fluid cylinder connected to the valve, the electronic indicating device comprising a member for acquiring, storing and processing data and at least one data display connected to the member for acquiring, storing and processing data, the valve having a sensor for sensing the position of the member for manually controlling the regulating member, the position sensor being connected to the member for acquiring, storing and processing data in order to transmit to the latter a signal indicative of the fluid flow rate and/or pressure set by the regulating member, the member for acquiring, storing and processing data being configured to cause an information item relating to the mode of use of the valve to be displayed on the display in response to the reception of this set flow rate and/or pressure signal, the valve having a pressure sensor configured to measure the pressure within the storage volume of the pressurized fluid cylinder connected to the valve, the pressure sensor being connected to the member for acquiring, storing and processing data in order to transmit to the latter a signal indicative of the measured fluid pressure, wherein the member for acquiring, storing and processing data is configured to receive both the signal of pressure measured by the pressure sensor and the flow rate and/or pressure signal supplied by the position sensor and to calculate, in response, a value of the quantity of remaining fluid and/or withdrawn fluid from these two signals, the member for acquiring, storing and processing data being configured to: calculate an actual value of the quantity of remaining fluid and/or withdrawn fluid on the basis of the pressure measurement by the pressure sensor,calculate a theoretical value of the quantity of remaining fluid and/or withdrawn fluid on the basis of the regulation set by the regulating member and measured by the position of the control member,compare said actual value based on the measurement by the pressure sensor with the theoretical value set by the regulating member, andgenerate a warning signal if these theoretical and actual values diverge to an extent greater than a given safety threshold. 2. The valve of claim 1, wherein the value of the quantity of remaining fluid and/or withdrawn fluid is at least one member of group consisting of: the pressure of the fluid, the quantity of fluid by mass or volume, the autonomy of fluid remaining in the pressurized fluid cylinder, the variation in the quantity or pressure of fluid in the cylinder, the withdrawn fluid flow rate, the autonomy of remaining fluid in quantity, and the temporal autonomy of remaining fluid at a given withdrawing flow rate. 3. The valve of claim 1, wherein the safety threshold corresponds to a divergence of 15 to 35% between the actual and theoretical values. 4. The valve of claim 1, wherein the member for acquiring, storing and processing data is configured to calculate the theoretical autonomy of remaining fluid from the initial pressure measured, from the theoretical decrease over time in pressure or the quantity of gas generated by the withdrawing flow rate and/or pressure set by the regulating member, and to calculate the actual autonomy of remaining fluid from the initial pressure measured and the actual decrease over time in pressure or the quantity of gas measured by the pressure sensor. 5. The valve as of claim 1, wherein the member for acquiring, storing and processing data is configured to calculate an information item relating to the autonomy or content of fluid over a given period of time of between one second and ten minutes from the current pressure and the theoretical decrease over time in pressure or the quantity of gas set by the regulating member. 6. The valve of claim 1, wherein the member for acquiring, storing and processing data is configured to calculate a value relating to the autonomy or content of fluid over a given period of time of between thirty seconds and ten minutes from the signal of pressure measured by the pressure sensor. 7. The valve of claim 1, wherein the member for acquiring, storing and processing data is configured to sense the pressure measured by the pressure sensor for a time of between 1 ms (millisecond) and 100 ms every 5 s (seconds) to 60 s. 8. The valve of claim 1, wherein the member for acquiring, storing and processing data is configured to sense the position of the manual control member measured by the position sensor for a time of between 1 ms and 50 ms every 1 to 20 seconds. 9. The valve of claim 1, wherein the theoretical value relating to the autonomy or content of fluid remaining in the pressurized fluid cylinder is expressed in time remaining by dividing the initial pressure measured by the pressure sensor by the theoretical variation in pressure set by the regulating member, by a formula of the type: Time remaining=Initial pressure/variation in pressure set, the quantity being estimated via the perfect gas equation (PV=nRT) or real gas equation (PV=ZnRT), where P is the pressure measured, V the known volume of the pressurized fluid cylinder, n the quantity, R the perfect gas constant and T the temperature measured or approximated to the ambient temperature measured, Z the compressibility factor known from a table or calculation. 10. The valve of claim 1, wherein the member for acquiring, storing and processing data is configured to recalculate automatically an update of the value relating to the autonomy or content of fluid on receiving a signal from the position sensor indicating a change in fluid flow rate and/or pressure set by the regulating member via the control member. 11. The valve of claim 1, wherein the sensor for sensing the position of the control member comprises at least one of: a capacitive sensor, a magnetic sensor, or a mechanical sensor. 12. A pressurized fluid cylinder, comprising a valve as claimed in claim 1. 13. The cylinder of claim 12, wherein, after the cylinder has been filled and before first withdrawal, the member for acquiring, storing and processing data is configured to cause a fixed information item relating to the fluid content in the cylinder to be displayed on the display until the position sensor transmits a signal indicative of a flow rate and/or the pressure of fluid withdrawn from the reservoir for a given time and/or corresponding to a given quantity of fluid.