Deflating a tire with a broken valve

[AnnieBikes]

You might actually be able to replace the valve itself. A few weeks ago, I unscrewed the cover cap on the valve of my road bike, and it was after riding my touring bike for two weeks, so the valve was sort of "stuck". The cap unscrewed the valve itself, a completely separate thing from the tube. So your LBS may be able to replace the valve separately from the tube.

[redrhodie]

Would a valve extender help?

[DebW]

Some, not all tubes, have replaceable valves. You can ask at your LBS, but they may prefer to just sell you a new tube.

You might actually be able to replace the valve itself. A few weeks ago, I unscrewed the cover cap on the valve of my road bike, and it was after riding my touring bike for two weeks, so the valve was sort of "stuck". The cap unscrewed the valve itself, a completely separate thing from the tube. So your LBS may be able to replace the valve separately from the tube.

[marni]

if nothing else works, scrap the tube- stab it with a knife or something and move on with a new tube.