High efficiency steam engine and impact-free piston operated valves therefor
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United States of America Patent
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Apr 30, 2019
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N/A
app pub date -
Oct 26, 2017
filing date -
Oct 26, 2017
priority date (Note) -
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Abstract
A high efficiency variable cutoff uniflow steam engine with piston operated valves has an exhaust valve that is held open by a spring during the exhaust stroke but is closed at an end of the exhaust stroke by the piston compressing steam in a compartment associated to act on the exhaust valve. The piston continues to move in the same direction a short distance toward top dead center (TDC) compressing a small residual quantity of steam in the cylinder above the piston during the remaining fraction of the exhaust stroke with sufficient pressure to open the steam inlet valve by steam pressure without an impact caused by physical contact with the piston.
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