Safety valve and liquid-propellant rocket engine: what they have in common

1. Step 1. Safety valve — is part of — Boiler. A mandatory safeguard for boilers.
2. Step 2. Boiler — is part of — Steam turbine. Steam from the boiler.
3. Step 3. Steam turbine — evolved into — De Laval nozzle. De Laval invented the nozzle for a steam turbine.
4. Step 4. De Laval nozzle — is part of — Liquid-propellant rocket engine. A nozzle.

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