isolating valve
nounUK /ˈaɪsəleɪtɪŋ vælv/
US /ˈaɪsəleɪtɪŋ vælv/
A valve is a part that can stop or let water or gas go through a pipe.
Before fixing the sink, the plumber closed the isolating valve to stop the water.
OTHER MEANINGS
2. A valve used to separate one part of a system so it can be worked on safely.
The engineer turned the isolating valve to cut off the boiler from the main line.
3. A device that shuts off flow to a single fixture or appliance.
Each radiator has its own isolating valve for maintenance.
4. A safety valve that stops fluid or gas from moving between two sections.
The isolating valve prevented gas from leaking into the empty section of the pipe.