Pertains to valves or systems that control the flow of gases or fluids within an engine, particularly:
- steam to and from the cylinder(s) of a steam engine
- the fuel-air mixtures to, or exhaust gases from, internal combustion engines
This category has the following 4 subcategories, out of 4 total.
The following 29 pages are in this category, out of 29 total. This list may not reflect recent changes (learn more).