broken globe valve

Hi

I have a small brass globe valve that was screwed to a steel spigot

The steel part has snapped off inside the valve and all my attempts to remove it have failed

Is there any chemical way of eroding the steel and leaving the brass intact ? I have used electrosis to remove rust in the past and was thinking of this method but I am unsure what it will do to the brass

Any thoughts?

Thanks

Dougie

Edited By Dougie Swan on 20/05/2017 09:25:54

Alum is sometimes used to disolve broken taps in non ferrous metal so that may work.

Thanks Jason

How is it used?

Dougie

Just make up a solution and leave it in place for a week or so. The steel will corrode away until it becomes loose.

Suppose to work better when hot so pinch the best saucepan and use that.

If you have a google for something like "Alum tap removal" you should find some threads on its use

I have often used this method:

Use a hacksaw blade to make 3 or 4 cuts inside the broken stub. Cut deep enough that the root of the threads are visible, but no deeper. Use a sharp pointed punch to collapse the broken stub. Position the punch near one of the cuts. Catch the top edge of the broken stub with the punch and drive it toward the center of the opening. Usually the stub will come free when just one segment is collapsed. If badly corroded you may have to knock out all the segments.

Best to use a non metalic container, if you are going to heat it, glass is best.

Ian S C