A device having a flow channel (K) for a fluid has a nonreturn valve (4) arranged in the flow channel (K) said nonreturn valve (4) allowing the fluid to flow through the flow channel (K) in a first direction and preventing it from flowing through the flow channel (K) in a direction counter to the first direction. The device furthermore has 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 nonreturn valve (4). This detected change serves as an indicator for the flow of the fluid. The device according to the invention enables flow detection with simple means, in that a nonreturn valve that is present is used as an indicator means.一種具有用於一流體之一流動通道(K)的裝置，其具有一佈置於該流動通道(K)中的止回閥(4)，該止回閥(4)允許該流體在一第一方向上流過該流動通道(K)且阻止該流體在與該第一方向相反的一方向上流過該流動通道(K)。此外該裝置具有一流動偵測器(5)，其用於偵測該流體通過該流動通道(K)之流動，其中該流動偵測器(5)偵測該止回閥(4)的變化。此偵測到之變化充當對該流體之流動的一指示器。因為存在的一止回閥可用作一指示器機構，所以根據本發明之裝置允許利用簡單機構來偵測流動。
