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There may be no piston or valve in the model. Not needed for this show.The entire system would build to the same air pressure quite quickly, as soon as the valve moved, so the engine would not even start if the plumbing was configured as shown.Gene
... As I tell friends regularly perpetual motion on earth is a pipedream but they keep trying to convince me it exists. ...
Good point! Glad that woodpecker who was banging on the top of my furnace flue at dawn got tired...