Filtering device

A filtering device configured to be immersed at least partially in a fluid to be filtered and comprising at least one main filter and a filter holder supporting the main filter, wherein the filtering device is configured to be moved inside the fluid and wherein;

• the filter holder comprises a body and at least one first and a second valve units, the body and the at least one first and second valve units defining a filtering chamber inside of which the main filter is arranged;
• the main filter has an outer wall facing the body and an inner wall opposite to the outer wall;
• the main filter delimiting in the filtering chamber an inner portion and an outer portion of the filtering chamber, the inner portion facing the inner wall of the main filter and the outer portion facing the outer wall of the main filter
• the filter holder comprises at least one inlet opening defined by the at least one first valve unit and at least one first intake valve cooperating with the at least one inlet opening and configured to allow the fluid to pass through the at least one inlet opening only when the filtering device is moved in a first movement direction;
• the filter holder comprises at least one outlet opening defined by the at least one second valve unit and at least one first release valve cooperating with the at least one outlet opening and configured to allow the fluid to pass through the at least one outlet opening only when the filtering device is moved in said first movement direction;
• the at least one first intake valve being arranged upstream of the at least one first release valve with respect to the direction of flow of the fluid in the filtering device when the filtering device is moved in the first movement direction;
• the passage of the fluid through the at least one inlet opening allowing the fluid located upstream from the filtering device when the filtering device is moved in the first movement direction to penetrate into the filtering chamber;
• the passage of the fluid through the at least one outlet opening allowing the fluid located in the filtering chamber to flow outside of the filtering chamber when the filtering device is moved in the first movement direction;
• the at least one inlet opening and the at least one outlet opening being arranged in such a way that when the filtering device is moved in said first movement direction, the fluid passes through the main filter in a first filtering direction to pass from the at least one inlet opening to the at least one outlet opening;
• the filtering device being configured to prevent the fluid from passing through the main filter in a second filtering direction opposite to the first filtering direction when the filtering device is moved in a second movement direction opposite to the first movement direction.