Setting valves: Difference between revisions

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[[Category:Steam Locomotive Parts]]
#Redirect:[[Valve Timing]]
 
== Valve Formulas ==
 
From Larry Koehl, <i>[[Live Steam Magazine]]</i>, June 1976
 
 
: [[File:Valve Travel formula.gif]]
 
 
: [[File:Valve Cut Off formula.gif]]
 
 
The Throw of Eccentric formula, below, applies only to locomotives using Stephenson valve gear.
 
 
: [[File:StephensonEccentricThrow formula.gif]]
 
 
Larry suggests adding up to 0.002 inches to the Throw of Eccentric value for each pin in the valve gear (including the eccentric, too) because, even when new, there will be lost motion, possibly enough to eliminate the lead.
 
Larry also points out the fact that Cut-Off is always 75% when Lap equals Port Width, for all values of Port Width.
 
== External Links ==
 
* [http://palivesteamers.org/pubs/gazette/2011_1-2.pdf "Steam Cutoff - Part 1 - Fun with Efficiency", <i>PLS Gazette</i>]
* [http://palivesteamers.org/pubs/gazette/2011_3-4.pdf "Steam Cutoff - Part 2 - More Fun With Efficiency", <i>PLS Gazette</i>]
* [http://www.jghtech.com/html/dead-center-1.html "Finding Locomotive Dead Centers", Jeffrey G. Hook]
* [http://enginemanwook.wordpress.com/2010/04/10/steam-engine-steam-cutoff-explained/ "Steam Engine Steam Cutoff Explained"]
* [http://books.google.com/books?id=TKV-AAAAMAAJ&dq=Yoder%20Wharen%20%22Locomotive%20Valves%20and%20Valve%20Gears%22%20ragonnet&pg=PR12#v=onepage&q=Yoder%20Wharen%20%22Locomotive%20Valves%20and%20Valve%20Gears%22%20ragonnet&f=false Locomotive Valves and Valve Gears, with a Special Treatise on Valve Setting]
* [[Allen Models of Michigan]] catalog contains a write-up on how to set valves for an Stephenson Valve Gear.
* [http://www.discoverlivesteam.com/magazine/179/index.htm "The Company Notch", <i>DiscoverLiveSteam.com</i>]

Latest revision as of 16:58, 24 July 2014

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