Steam Engine Design/Slide Valve
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Description
The slide valve was used in many steam engines in the early part of the 20th century, when steam locomotives, tractors, and other steam machines were common. It consists of a plate with one (or more) holes that let steam pass at the right point in the steam cycle. The slider valve was often driven by an eccentric on the drive shaft. This allowed the timing to be adjusted somewhat.
Diagram
