Device intended for a double glazing including at least one outer glazing and one inner glazing separated by an intermediary space filled with a gas, used to isolate an inside environment from an outside environment, a pressure variation being liable to occur between these environments, for example in the case of an aircraft in flight,includes means for conserving the outer glazing and the inner glazing of this double glazing mainly parallel, independently of this pressure variation.The invention also concerns a double glazing including this device, the process for maintaining parallelism and software using the process.