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Steam operated drain cocks

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duncan webster14/06/2021 18:32:27
3444 forum posts
63 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.

Baz14/06/2021 19:31:18
554 forum posts
2 photos

Totally agree with Duncan

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