| 41. | Six locomotives were equipped with superheating, bore cylinders and inside admission piston valves and were reclassified to Class 8BW.
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| 42. | Four locomotives were equipped with superheated boilers, bore cylinders and inside admission piston valves and reclassified to Class 8W.
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| 43. | Although they used the same type of boiler they carried a higher pressure and were fitted with piston valves.
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| 44. | Seven of the eleven were fitted with larger cylinders, Stephenson valve gear and piston valves, raising the weight to.
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| 45. | Early designs used the D slide valve but this has been largely superseded by Piston valve or Poppet valve designs.
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| 46. | Pistons and piston valves are made of aluminium and have hollow rods for to keep the weight in desirable limits.
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| 47. | The poppet valves were not a great success and they all reverted to piston valve engines between 1931 and 1934.
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| 48. | The cylinders were arranged outside the plate frames, with the piston valves above the cylinders and actuated by Walschaerts valve gear.
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| 49. | Modern piston valves were developed by Fran�ois P�rinet for the saxhorn family of instruments promoted by Adolphe Sax around the same time.
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| 50. | It involves the ceramic coating of automotive parts and components specificallycylinder head fire deck, piston crown or head, and piston valve base.
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