Valve trumpet and electric fan: what they have in common

1. Step 1. Valve trumpet — has part — Valve. Valves.
2. Step 2. Valve — is part of — Central heating. Valves on the radiators set how much hot water flows into a room.
3. Step 3. Central heating — has part — Centrifugal pump. A circulation pump.
4. Step 4. Centrifugal pump — has part — Impeller. The impeller accelerates the liquid.
5. Step 5. Impeller — is part of — Electric fan. A fan's blades are an impeller that pushes the air.

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