View source for Cylinder Cocks/sv

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Cylinders are {{pll|Steam Overview|steam engine}} components that house pistons that propel the vehicle. Typically, there are two cylinders in the front of the vehicle, one on each side. They are alternately fed steam from the {{pll|Regulator|steam chest}}, with every full rotation of the driving wheels, in the amount set with the {{pll|Cutoff|cutoff}}.
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Steam in cylinders pushes the pistons inside, mechanically linked to the driving wheels, propelling the vehicle. The used steam is then expelled through a blastpipe, where it mixes with smoke from the {{pll|Firebox|firebox}} in the smokebox, and together they are exhausted to the atmosphere through a chimney.
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När ånga inte längre släpps in i cylindrarna kyls de snabbt av. Detta beror på att de är separerade från pannan och eldstaden. Ångan i cylindrar kondenserar sedan tillbaka till vatten ganska snabbt. Eftersom vatten inte är komprimerbart, till skillnad från ånga, kan det, om tillräckligt mycket av det samlas i cylindrarna och trycks av en kolv, bryta cylindrarna och orsaka katastrofala drivlinsskada.
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To prevent this, steam engines come equipped with cylinder cocks. They are usually operated by a lever from inside the {{pll|Rail Vehicle Types|cab}}, and allow water to be expelled from the cylinders. However, since steam escapes through the cocks too, they should only remain open for a short time, typically just a few seconds, when the vehicle begins moving from a standstill.
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Cylinders can also fill with water if the {{pll|Water Level|boiler is overfilled}}, or from running the vehicle with the {{pll|Cutoff|cutoff}} set in the opposite direction.
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[[Category:Steam Drivetrain|3]]