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duncan webster	14/06/2021 18:32:27
5307 forum posts 83 photos	Consider it my way round. The diameter of port 1 scales at half the outside diameter of the Oring, so the areas are 4:1. The area exposed to cylinder pressure is 3/4 of that exposed to boiler steam pressure, and so if cylinder pressure is 1.333 * boiler pressure the valve will open. The other way round you need cyl pressure = 4* boiler pressure to open it. As Fizzy says, both work. The drawing implies port 1 is exhaust as there is no thread to secure it.
Baz	14/06/2021 19:31:18
1033 forum posts 2 photos	Totally agree with Duncan

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