Hi Chaps

I need to probe the collective wisdom. I am looking to get a boiler made for a Perrier King 5". Has anyone had expirience with using ceramic cartridges (domestic tap style) as the disc valve of a loco regulator and would be willing to pass on your thoughts.

The other issue is the design relies on a main steam pipe screw cut at either end to connect between the wet header bush in the smokebox and the back end of the regulator valve assembly. The rest of the assembly is connected to the backhead bush and sealed with the usual flange on the face of the backhead bush. Apart from the difficulty of assembly I am concerned at how steam tight the main steam pipe will be, even assuming sealing compound on the threads the lengths of the various bits are critical.

So pointers in the right direction would be welcome to standard ways of acheiving good seals on the various pipes within the boiler and different arrangements to allow fitting it all together.

Best regards Martin