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Продувательные клапаны цилиндров

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При остановке подачи пара в цилиндры, они быстро остывают. Это связано с тем, что они отделены от котла и топки. Вследствие этого, пар, оставшийся в цилиндрах, довольно быстро конденсируется обратно в воду. Вода, в отличие от пара, несжимаема, и если достаточное её количество соберётся в цилиндрах и толкнётся поршнем, это может привести к поломке цилиндров и вызвать критические повреждения паровой машины.

For this reason there are cylinder cocks. They are operated by a valve from inside the cab, allowing water to be released from the cylinders. As some of the steam from the cylinder is lost while the cylinder cocks are open, acceleration is reduced. Typically, the drivers open cylinder cocks for a few seconds after being stationary for some time.

Cylinders can also fill with water in a process called priming. This is the case of the boiler having too much water, or running the vehicle with the cutoff set in the opposite direction, causing water to overflow into the cylinders.

See also: Mechanical Powertrain Damage, Water Level, Cutoff