December 17, 2009 12:40AM
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Registered: 16 years ago
Posts: 1,816
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Bill, I think what you are thinking of is not the valve gear but inside and outside
admission valves. Some consider "inside admission" as being like the K-27's 454, 456, 458 and 461 where the piston valve is inboard of the cylinder and "outside admission" as being where they are outboard of the cylinder like the K-28's. This is an error. The location of the piston valve is solely determined by the linkage of the valve gear. Engines with piston valves and Stephenson valve gear often had the piston valves inboard to line up with the gear and most outside mounted valve gears, like Walschaerts and Baker,link to the outboard piston valves. The aforementioned K-27's had their piston valves actuated by Stephenson valve gear when they were first installed and had to be modified with a crossover link when Walschaerts gear was installed.
Outside admission valves are where the steam is admitted to the cylinders around the outside of the moving valve seat at the outside area of the valve chest and the exhaust steam exits at the middle of the valve. These are normally in the shape of D-valves in the old square slide valve chests.
Inside admission valves are where the steam is admitted to the cylinders at the center of the valve chest and the exhaust steam exits around the outer ends of the valve. These are normally piston valves. The K-28's have inside admission piston valves and Walschaerts gear.
Edited 1 time(s). Last edit at 12/17/2009 12:42AM by Herb Kelsey.
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Bill Pratt |
December 16, 2009 06:29PM |
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little stanley |
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bookemdanno |
December 16, 2009 07:39PM |
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little stanley |
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bookemdanno |
December 17, 2009 04:42AM |
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Kelly Anderson |
December 17, 2009 06:23AM |
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bookemdanno |
December 17, 2009 07:07AM |
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bookemdanno |
December 17, 2009 01:48PM |
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bcp |
December 16, 2009 08:49PM |
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Herb Kelsey |
December 17, 2009 12:40AM |
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Russo Loco |
December 17, 2009 01:06PM |
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bookemdanno |
December 17, 2009 01:35PM |
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Russo Loco |
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bookemdanno |
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bookemdanno |
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Russo Loco |
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bookemdanno |
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December 17, 2009 03:16PM |
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December 17, 2009 04:12PM |
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madjack |
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madjack |
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Earl |
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Don Newing |
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SebJ |
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SebJ |
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Russo Loco |
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SebJ |
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SebJ |
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Russo Loco |
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SebJ |
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Russo Loco |
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tomc |
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SebJ |
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Russo Loco |
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myork |
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Earl |
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trainrider47 |
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Russo Loco |
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mesaman3000 |
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Russo Loco |
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Bill Pratt |
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EBTMikes |
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