And from the footnote:
"The regulator shuts once a small amount of hot steam has entered into the cylinder."
No, it doesn't, the regulator is essentially just a tap, that restricts the flow-rate of the steam. The amount of steam that enters the cylinder is controlled by the valve-gear. In a simple model, it is probable that the cylinder (head) gets filled with steam at (almost) boiler-pressure.
Biting the hand that feeds IT
