One of the mysteries of the English language finally explained.
Permitting the flow of air or liquid in one direction only.‘a nonreturn valve’
- ‘Watering outdoor plants isn't likely to be a high priority on these wet days but if you do use a hose for the garden, or to wash the car, remember to fit a non-return valve on the tap to prevent back-flow.’
- ‘Its only moving parts are a spring-loaded ‘clack’ valve and a non-return flap valve.’
- ‘Self-sealing crashworthy fuel tanks have explosion suppression and non-return valves.’
- ‘If it is taking in air it means that the non-return valve is leaking and needs to be replaced.’
- ‘A non-return flap is usually fitted to prevent cold air coming in.’
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