valve
valve /v'ælv/ (valves)
1 [N-COUNT]
A valve is a device attached to a pipe or a tube which controls the flow of air or liquid through the pipe or tube.
2 [N-COUNT]
A valve is a small piece of tissue in your heart or in a vein which controls the flow of blood and keeps it flowing in one direction only.
He also has problems with a heart valve.
3
see also safety valvesafe|ty valve (safety valves)
1 [N-COUNT]
A safety valve is a device which allows liquids or gases to escape from a machine when the pressure inside it becomes too great.
Residents heard an enormous bang as a safety valve on the boiler failed.
2 [N-COUNT]
A safety valve is something that allows you to release strong feelings without hurting yourself or others.
...crying is a natural safety valve.
1 [N-COUNT]
A valve is a device attached to a pipe or a tube which controls the flow of air or liquid through the pipe or tube.
2 [N-COUNT]
A valve is a small piece of tissue in your heart or in a vein which controls the flow of blood and keeps it flowing in one direction only.
He also has problems with a heart valve.
3
see also safety valvesafe|ty valve (safety valves)
1 [N-COUNT]
A safety valve is a device which allows liquids or gases to escape from a machine when the pressure inside it becomes too great.
Residents heard an enormous bang as a safety valve on the boiler failed.
2 [N-COUNT]
A safety valve is something that allows you to release strong feelings without hurting yourself or others.
...crying is a natural safety valve.