Valve for pressurized fluid and tank furnished with such a valve

A valve for pressurized fluid, with or without incorporated pressure-reducing valve, comprising a body comprising a fluid circuit having an upstream end designed to be placed in communication with a reserve of pressurized fluid and a downstream end designed to be placed in communication with a pressurized fluid using device, the circuit comprising an isolation valve element configured to selectively close off the circuit, the isolation valve element being configured to be controlled by a lever, wherein the lever is mounted so as to be capable of pivoting on the body between a rest position in which the isolation valve element is configured to close the fluid circuit and an active position in which the isolation valve element is configure to open the fluid circuit, wherein the lever comprises at least one opening and in that, when the lever is configured in at least one of the active position, the rest position, or an intermediate position between these two positions, the opening accommodates within it a portion of a functional member mounted on the body of the valve, wherein the functional member comprises a measuring member adapted to measure a physical magnitude of the fluid in the circuit, the measuring member comprising a display, the opening of the lever having a shape that matches the display of the measuring member, and wherein when the lever is configured in a position selected from the group consisting of the rest position, the active position and an intermediate position, at least a portion of the display of the measuring member is positioned through the opening of the lever, and the display is at least partially surrounded by the body of the lever and incorporated into a volume of the lever.