The whistle steam supply was finished today. The steam comes from a big piece of hex that is situated between the boiler and the regulator valve. This was drilled for a union to be silver soldered.
The plumbing run was then done to the union at the front adjacent to the chimney where there is reasonable access.
A phos bronze spring was wound around a 1/16" drill, and ends ground square. It was then fitted to the whistle and the plug drilled to acommodate it. A 1/8" stainless ball was fitted to the valve. The plumbing was tested on air with a whistle hooked up to a piece of hose. The valve works well!
Happy steaming!
Nigel
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