Permitting the flow of air or liquid in one direction only.
单向的
a non-return valve
单向阀。
Example sentencesExamples
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.
A non-return flap is usually fitted to prevent cold air coming in.
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.
Definition of non-return in US English:
non-return
adjectiveˌnänrəˈtərn
Permitting the flow of air or liquid in one direction only.
单向的
a nonreturn valve
单向阀。
Example sentencesExamples
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.
Its only moving parts are a spring-loaded ‘clack’ valve and a non-return flap 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.
If it is taking in air it means that the non-return valve is leaking and needs to be replaced.