mott
Hi-poster
Posts: 151
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Post by mott on Mar 18, 2006 20:20:50 GMT
Hi guys, Firstly I agree with the sentiments of the earlier string about ModelWorks. However I don't think they are out of the wood just yet. The 14XX kit which I though I had successfully completed has been plagued with problems in course of raising steam but most it turns out have been "known faults". Some are really glaring such as the inadequate safety valve, bad joint at the steam chest and now I am wondering about the regulator.
When I pressurise the boiler either with water or compressed air and with the regulator closed I find either water (or air) coming out of the exhaust blast pipe. usually there is a water coming our of the drain cocks also. Now we can all agree that if the regulator is fully closed that should not happen. Having eliminated leaks into the steam pipe inside the boiler I am left with the regulator. I have a theory that back pressure is lifting the regulator valve against the inadequate spring sitting on top of the valve. I think pressure in the boiler is overpowering the o ring supposedly sealing the screw carriying the cam which lifts the valve to admit steam when the regulator handle is turned. I can think of no other expanation. I will try an experiment with a stronger spring keeping the valve closed but am wondering if this yet another "known fault". Any parallel experiences? Mott.
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sjtown
Active Member
Posts: 38
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Post by sjtown on Mar 18, 2006 21:35:02 GMT
Mott,
I'm pretty sure I haven't had this problem, although not 100% as haven't run it in months!
I have put the Modelworks drawing of the regulator system in the images section with my own conversion drawing for fitting the Modelworks regulator to Winson.
I used the Modelworks original spring on mine and seems to be powerful enough to stop any sort of back pressure.
It did get stuck open once on the rolling road though, which was 'interesting' to say the least, seeing as the fire was good and was about to put some more water in and was running at a good speed! A few open a close movements closed it off again saving me from disaster. Think I can only put that down to a bit of scale getting caught as I closed it, or having opened to to far at one point and it catching on the cam. (this was before final adjustments so I wasn't actually opening her up to full throttle as it may seem!!)
The only other thing I can think of is the pipe from the regulator to the banjo not sealing in the boiler either with the banjo or main assembly, meaning constant leaking to the pistons...??
Will be very interesting to hear how your experiments go!
Steve
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Post by burnettsj on Mar 20, 2006 10:43:04 GMT
It did get stuck open once on the rolling road though, which was 'interesting' to say the least, seeing as the fire was good and was about to put some more water in and was running at a good speed! A few open a close movements closed it off again saving me from disaster. If the regulator doesn't shut for whatever reason - putting engine in mid gear should avert disaster. |
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mott
Hi-poster
Posts: 151
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Post by mott on Mar 20, 2006 10:51:30 GMT
Yes I clearly understand your point, but before you can get into steam if the regulator is leaking steam you will never get up enough steam pressure in the boiler to turn the wheels.Mott
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mott
Hi-poster
Posts: 151
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Post by mott on Mar 20, 2006 12:20:09 GMT
A final point to complete this string.I have discussed this problem with Ian at ModelWorks and concluded that the problem probably lies in the profile of the cam which lifts the regulator valve. When fully closed the valve lifts off its seat slightly, with 90lbs pressure in the boiler it will then pass thru quite a quantity of water, hence it is not possible to pressurise the boiler.Mott PS thanks for helpful comments on this and the "steam chest" string.
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mott
Hi-poster
Posts: 151
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Post by mott on Mar 28, 2006 17:47:32 GMT
A final, final conclusion of this string. The fault was establsihed by ModelWorks Technical Support . They examined the loco and quickly found the the regulator was leaking, a new one was installed very quickly and the loco loaded back into my car all within 2 hours. The joint between the steam pipe and regulator which was previously under suspicion was found to be sound. Ian and Debbie at ModelWorks really know their business and I left well satisfied with the decisive way they sorted out the problem. Mott
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Post by johnaj on Feb 20, 2011 10:42:49 GMT
I am attempting to renovate aWinsom 1400, and i am not happy with the inner dome where it screws onto the regulater.Is it possible to drill the thread out, so that the inner dome slides over the thread portion of the regulator ,and bolts on to the boiler. I hope this makes sense John
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