Answer :
Final answer:
The check valve, also known as a non-return valve, allows fluid to flow in a single direction and automatically closes when fluid flow is reversed.
Explanation:
In a fluid control system, when flow is stopped or reversed, it is the Check Valve that reacts. The check valve, also known as a non-return valve, is a special type of valve that allows fluid to flow in only one direction and automatically shuts when the flow is reversed. This is important in preventing any potential damage or inefficiencies that could occur if a fluid were allowed to flow the wrong way through the system. None of the other options provided (pressure relief valve, ventilation duct, excess flow valve) take action upon reversal of flow in the same way as check valve.
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