Device and method of introducing air into a hydropneumatic reservoir.

hydropneumatic system with charging air, comprising a hydropneumatic tank anti-ram or the adjuster (1) configured to be connected to a pipe (2) and comprising a device for introducing air (3) into the hydropneumatic tank (1) , characterized in that it comprises a sensor (6) of the pressure in the tank, a gate valve (9), controlled by a signal from the sensor, leads outdoor one hand, a tube (8) connected at one end to the gate valve (9) and, at the opposite end, the pipe (2), a first flap (11) arranged on the tube to prevent passage of fluid from the tube to the gate valve and a second flap (5) configured to be arranged in the pipe between the reservoir (1) and the tube (8), the second flap (5) being configured to be closed when a pump (4) mounted on the pipework upstream of the second flap (5) is stopped And open as the pump (4) starts.