Rolled Top Radiator Bleed Valve

[Anthony.J.Parry]

Can anyone help, have removed a number of old rolled top radiators and had them shotblasted and powder coated. Now I can't get bleed nipples back in as threads have an issue. Would like to re-tap out the threads can anyone suggest the thread size, have looked on other sites and the only reference is 1/8 bsp.
Alternative is can anoyone suggest metric screw that will fit thread as brass blead screws are too soft and I just keep destroying the thread.

 

[justlead1]

Hi It may pay to borrow or buy a tap slightly larger than existing. Drill out as to data that surrounds screws and taps. Good Luck

 

[stevetheplumber]

Can anyone help, have removed a number of old rolled top radiators and had them shotblasted and powder coated. Now I can't get bleed nipples back in as threads have an issue. Would like to re-tap out the threads can anyone suggest the thread size, have looked on other sites and the only reference is 1/8 bsp.
Alternative is can anoyone suggest metric screw that will fit thread as brass blead screws are too soft and I just keep destroying the thread.

If they were blasted with the screws out its possible the threads are damaged i assume you mean cast iron colum rads ?if so you can change the bushes or the airvent if seperate

 

[migoplumber]

i come across stuck bleed valves on old systems often.
i now drill and retap a new hole with 1/8 bsp cap end.
go to your local iron monger, there is a chart with drill sizes and taps that he will have and have to adhere to. if you want to be really clever you could tap to 1/2inch and install a new bleed valve complete.

 

[stevetheplumber]

i come across stuck bleed valves on old systems often.
i now drill and retap a new hole with 1/8 bsp cap end.
go to your local iron monger, there is a chart with drill sizes and taps that he will have and have to adhere to. if you want to be really clever you could tap to 1/2inch and install a new bleed valve complete.

local iron monger thats a quaint idea dou8bt if theres an iron monger left in london its all b and q down here