Final answer:
An indicating valve is a gate or butterfly valve in domestic water supply systems or fire pumps that allows for visual status checks of its position. It differs from valves in the cardiovascular system and is unrelated to the Flow-Through in ballast tanks.
Step-by-step explanation:
The valve that controls the flow of water from the domestic water supply system and/or fire pumps, known as an indicating valve, is essential for regulating water flow in various systems. In the context of domestic or fire protection systems, an indicating valve is typically a gate valve or a butterfly valve. These valves show their open or closed status, which is crucial for safety and maintenance purposes. An indication mechanism on the valve is what gives it the name 'indicating valve,' as it provides a visual or other signality of the valve's position.
In contrast, valves in the cardiovascular system are specialized structures ensuring one-way blood flow and do not apply to domestic water systems. Similarly, the concept of Flow-Through as it relates to ballast tanks is not directly applicable when discussing domestic water systems and indicating valves.