| 11. | His third stream of philosophy was based around piston valves.
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| 12. | The high-and intermediate-pressure cylinders used piston valves, whereas the low-pressure cylinders used slide valves.
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| 13. | Examples with either slide or piston valves were common.
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| 14. | For the valve gear it used a banjo drive to a close fitting piston valve.
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| 15. | Consequently, the following locomotives were built with piston valves.
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| 16. | Instead, a system of piston valve from the motion.
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| 17. | Most of the superheated engines were also converted from having slide valves to piston valves.
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| 18. | The piston valves were of the outside admission type.
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| 19. | The piston valves were driven by Stephenson valve gear.
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| 20. | Countersteam braking is however only achievable with piston valves.
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