An automated pressure regulator (60) includes an inlet port (72) configured to engage a pressurized gas bottle (58) to receive pressurized gas (99) therefrom, and an outlet port (74) that is sealably coupled to an inflatable bladder (44). The inlet port (72) is in fluid communication with the outlet port (74), with the pressure regulator (60) including a check valve disposed between the inlet port and the outlet port. The check valve is realized by a slideable piston (62) or a floating diaphragm (68). In the case of a piston, a annular flange (68) includes an inner surface (80) that engages against a spring (76) positioned between the flange (68) and the outlet port. Under a closure force applied by a combination of the spring and any internal gas pressure acting on its inner surface (80), an outer facing surface (90) of the annular flange (68) positively engages against a seal (88) to effect automated closure of the inlet when a counteracting gas pressure from pressurized gas (99) impinging on the outer surface (90) of the flange (68) is insufficient to overcome the closure force. The springs tension is selected or varied to moderate the point when pressurized gas in the gas bottle overcomes the closure force and determines the level of inflation of the bladder (44). The automated regulator finds application in devices where rapid inflation is important and where monitoring of the pressure in the internal bladder is desirable so as to maintain an acceptable (minimum) pressure, but where user observation is not necessarily practicable because of the surrounding environmental conditions. For example, the pressure regulator (60) can be integrated into a portable battlefield tourniquet or a life vest.Linvention concerne un régulateur de pression automatique (60) comportant un orifice dentrée (72), conçu pour sengager dans une bouteille de gaz pressurisé (58) en vue de recevoir du gaz pressurisé (99) provenant de celle-ci, et un orifice de sortie (74) qui est couplé de
