21. It was a slide valve coal gas engine. 22. The class were fitted with a steam chest and slide valves located beneath the piston valves. 23. The high-pressure cylinders were fitted with diameter Richardson balanced slide valves and had a bore of. 24. Conventionally, piston valve locomotives had inside admission, whereas outside admission was used with slide valve locomotives. 25. The compression and expansion processes are provided by a specially designed reciprocating machine using sliding valves . 26. In the 3001 class the steam chest was located underneath the cylinders, and contained two slide valves . 27. All cylinders have flat slide valves and outside Heusinger valve gear with lifting links and Kuhn slides. 28. On simple slide valves , no opposing steam admission is possible due to the way they are constructed. 29. With a comparatively high boiler, later increased to, it was considered impractical to use traditional slide valves . 30. Superheating also required alteration of the valve gear and piston valves were therefore used instead of slide valves .
