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| Re: Real Long Read On NYCPropulsion/Braking (333694) | |||
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Re: Real Long Read On NYCPropulsion/Braking |
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Posted by BIE on Sat Nov 4 13:11:34 2006, in response to Real Long Read On NYCPropulsion/Braking, posted by chicagopcclcars on Thu Nov 2 20:32:01 2006. Why would you "replace" the J relay valves? Those valves could be "traded in" for full core credit.You just request a different ratio "J" valve in return. An Explanation. The "J"series relay valves work to `provide the brake cylinders a high volume source of air which is of the same pressure or a set multiple of the pressure as a low volume control pressure sent from the control and brake valving. For instance, a diesel locomotive has cast iron brake shoes and a 26L air brake schedule. This locomotive will have a regular J-1 relay valve which causes the brake cylinders to have a pressure of 45 PSI in full independent application. The same diesel, when retrofitted with composition brake shoes, will have a J-1.6-16 relay valve which will result in a full app. BCP of 72 PSI or 1.6 times the 45PSI control pressure. The brake cylinder will also be sleeved down to a smaller piston size. Technical description of the 1:! ratio J-1 Relay valve: http://techinfo.wabtec.com/DataFiles/O&Mfiles/pdf/4231-12.pdf Technical description of the 1.6:1 ratio J-1.6-16 Relay valve: http://techinfo.wabtec.com/DataFiles/O&Mfiles/pdf/4231-12,S.2.pdf |
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