What does valved mean refers to having valves or equipped with valves, and the accent in valved as written valve with grave accent may be typographical error or stylistic mark, but standard English word is valved without accent, meaning having or fitted with valve or valves. In biology, valved is used to describe structures that have valves, such as valved veins that contain valves to prevent backflow of blood, or valved heart. In engineering, valved pipe or valved system means pipe that has valve installed to control flow. For example, valved trumpet is trumpet with valves that change pitch, versus natural trumpet without valves. In medical context, valved holding chamber is device used with inhalers that has valve to control airflow. In botany, valved capsule is fruit that opens via valves. The term valved is adjective formed from noun valve plus suffix ed meaning having. So something that is valved has mechanism that opens and closes to regulate flow of liquid, gas, or air. The accent you wrote as valve with grave may be attempt to show pronunciation or from French valvee, but English spelling is valved. So overall, valved means possessing or equipped with one or more valves that control flow or movement in system.
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