The invention relates to a device having a flow channel (K) for a fluid, comprising a check valve (4) arranged in the flow channel (K), which check valve allows the fluid to flow through the flow channel (K) in a first direction and which prevents flow through the flow channel (K) in a direction opposite to the first direction. The device further comprises a flow detector (5) for detecting the flow of the fluid through the flow channel (K), wherein the flow detector (5) detects a change in the check valve (4). Said detected change serves as an indicator for the flow of the fluid. The device according to the invention allows flow to be detected using simple means, by using an existing check valve as the indicating means.
