Patent ID: 7264327

Claim:
A method of regulating negative or positive pressure in a reserve of liquid also containing a gas, comprising the following steps: a) defining a set pressure value around which the gas present in the reserve is to be maintained, and defining minimum and maximum threshold pressures for fast regulation that are respectively less than and greater than said set pressure value; b) measuring the instantaneous pressure of the gas present in the reserve; c) when the measured instantaneous pressure is less than said minimum threshold pressure or greater than said maximum threshold pressure, connecting said reserve with a continuous source of gas under positive or negative pressure, respectively, until said instantaneous pressure reaches a value between said threshold pressures; d) comparing the measurement of the instantaneous pressure of the gas present in the reserve with the set pressure value; e) in cases where the measurement of the instantaneous pressure of the gas present in the reserve is higher than the set pressure value, creating a calibrated volume of gas under negative pressure and then pulling it in communication with the reserve; and f) in cases where the measurement of the instantaneous pressure of the gas present in the reserve is less than the set pressure value, creating a calibrated volume of gas under pressure and then putting it in communication with the reserve.