Válvula de retenção e steam locomotive: o que têm em comum

1. Passo 1. Válvula de retenção — faz parte de — Piston pump. Check valves direct the flow.
2. Passo 2. Piston pump — evoluiu para — Watt steam engine. The first steam engines (Newcomen’s) pumped water out of mines by driving pumps.
3. Passo 3. Watt steam engine — faz parte de — Steam locomotive. A steam locomotive is driven by a steam engine.

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