non-return
/ˈnɒnrɪtəːn
/adjective
Permitting the flow of air or liquid in one direction only: a non-return valve...
- If it is taking in air it means that the non-return valve is leaking and needs to be replaced.
- Self-sealing crashworthy fuel tanks have explosion suppression and non-return valves.
- A non-return flap is usually fitted to prevent cold air coming in.
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