Abstract: The present invention relates to a device for controlling predetermined fluid sequences, which prevents unwanted diffusions between the same. The device is intended to control the flow of at least two fluids according to a preprogrammed path sequence, comprising a body (1) comprising a main reservoir (2), a main channel (3), at least one second reservoir (4) intended to house a second fluid, at least one secondary channel (5) connected to the second reservoir (4) and a liquid attraction element (6). Additionally, the body (1) comprises an air chamber (7) and at least one capillary check valve (8, 9), intended to retain the second fluid and at least two valve channels (10, 11) that enable the fluids to pass according to a predetermined sequence.