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| Re: Brake Valve pr0n Re: LIRR MP-54 #1149 and its ME-23 brake valve (485381) | |||
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Re: Brake Valve pr0n Re: LIRR MP-54 #1149 and its ME-23 brake valve |
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Posted by randyo on Mon Sep 3 20:47:45 2007, in response to Re: Brake Valve pr0n Re: LIRR MP-54 #1149 and its ME-23 brake valve, posted by SelkirkTMO on Sun Sep 2 23:23:11 2007. One variaton on the ME23 brake valve was the presence of the feed valve with an "overcharge button" on the left side of the pipe bracket. I only noticed these on the ME-21 brake valves on the IRT Hi-Vs and flivvers and the low numbered Lo-Vs. Should the feed valve overcharge the brake pipe and prevent the brakes from releasing, the M/M by pressing the overcharge button could bleed off the brake pipe air at the feed valve allowing the brakes to be released. Another which I belive was used in Philadelphia was a reduction limiting valve which would also be on the left side of the brake valve provision for which exists on later model ME-23s and ME-30s. Since reducing equalizing reservoir air more than 20 lbs causes the brake pipe to go into emergemcy, the reduction limiting valve would stop the reduction at 20 lbs preventing an unintended emergency application. The LIRR brake valve in question also was interlocked with the cab signal/speed control system whch required the engineer to make a minimum brake pipe reduction in order to supress a brake appliction consistent with the cab signal display. That probably accounts for that additinal device on th left side of the brake valve in the photo. There may be some LIRR people out there who may be familiar with the older equipment and may be able to explain the operation better than I can. |
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