Renault 88: Unknown valve in oil filter (Engine Alfa 598/30)

Hello, I've a question about the oil filter of my renault 88. What does the function of the valve you see in the picture in inner of filter? Oil pressure management? Many thanks for helping to understand. Best regards

Bonsoir,

La fonction de ce clapet à bille est d'assurer le graissage du moteur si par faute d'entretien l'élément filtrant à huile est colmaté et ne laisse plus passer l'huile mais dans cette hypothèse l'huile n'est plus filtrée.
Amicalement.

Good evening,

The function of this ball valve is to lubricate the engine if, due to lack of maintenance, the oil filter element is clogged and no longer lets the oil through, but in this case the oil is no longer filtered.
Best regards