Bellows nozzle and electric fan: what they have in common

1. Step 1. Bellows nozzle — is part of — Bellows. It directs air into the forge.
2. Step 2. Bellows — has part — Valve. A valve in the bellows lets air in when they open and keeps it from escaping back.
3. Step 3. Valve — is part of — Central heating. Valves on the radiators set how much hot water flows into a room.
4. Step 4. Central heating — has part — Centrifugal pump. A circulation pump.
5. Step 5. Centrifugal pump — has part — Impeller. The impeller accelerates the liquid.
6. Step 6. Impeller — is part of — Electric fan. A fan's blades are an impeller that pushes the air.

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