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Steam chest question

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Sky King:
This applies to Elmer's #29 mine engine.

Since the steam chest is .250" high and the valve is .203" high, that leaves a gap of .041" between the valve and the top cover.
Question is ,,what keeps the incoming steam from pushing the valve up and steam escaping instead of flowing through to the cylinder passage???  I am thinking the nut holds it down but still curious..

Julian

cwelkie:
I think you will find that the supply steam fills the steam chest and helps hold the sliding valve down onto the sealing surface.  The valve diverts the cylinder exhaust to the exhaust port.

crueby:

--- Quote from: cwelkie on June 06, 2019, 01:34:11 PM ---I think you will find that the supply steam fills the steam chest and helps hold the sliding valve down onto the sealing surface.  The valve diverts the cylinder exhaust to the exhaust port.

--- End quote ---
Agree - sometimes with steam chests on the side of the engine (where the valve face is vertical) you may get some leakage past the valve when first starting up with low pressure, but as soon as some flow goes past it will draw the valve in tight, then the pressure difference from inside the chest to the exhaust port holds it there.

b.lindsey:
Also important is a good flat and smooth interface between the valve and steam chest face (ports) to further eliminate any leakage.

Bill

Sky King:
I thought that too, but with the exhaust port hole in the cover all of the pressure seems to be escaping via it... I get a LOT of air escaping out the cover port,,,

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