Aveling canopy irons and safety valve cover

[ferguson_tom]

Originally Posted by No.41

Tom,

You can only fit an Aveling pattern safety valve bonnet if the cylinder top cover (which includes the safety valves) is flanged to fit the bonnet. For engines built without a canopy normally there was no flange. The bonnet size certainly differs between 8 and 10 ton rollers, but not sure about the 12 ton roller.

Sandy

Thanks Sandy, I didnt realise there was a special flange for them but will check on the engine. I may be wrong but i think the safeties on the 10 are same as on my 12 tonner. Although she never had a canopy fitted I would like to at least make it as close to the Aveling design as possible.

Being a glasses wearer the effects of lifting safety valves at junctions and traffic lights are well known!