Definition of non-return in English:

non-return

Line breaks: non-return
Pronunciation: /ˈnɒnrɪtəːn
 
/

adjective

Permitting the flow of air or liquid in one direction only: a non-return valve
More example sentences
  • 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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