[modeleng] Re: Valve Problem
- From: "Jesse Livingston" <fernj1@xxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Tue, 26 May 2009 15:07:15 -0500
I made a model of a beam engine that was made in about 1840 and came from
the Bagge Brewery to a museum in Old Blighty in the 1930s. The valve chest
cover has an adjusting screw on the original engine, but Richard Adamek did
not have an opportunity to take the cover off to be certain what the screw
did. From all appearances it would seem that the screw was set to allow
only a small amount of clearance between valve and cover so we figured that
it was there to keep the valve from falling away from the seat. Considering
that steam pressure on the beam engine was probably pretty low, it could
fail to push the valve against the seat so provision was made to keep it
from falling more than maybe a few thousandths off the seat. All of this
is pure conjecture, but why else have the adjusting screw in the valve chest
cover if not to help control the valve? A spring may be in there as Clif has
used, but I doubt it considering the age of the engine.
Jesse in extremely too wet Troy, TN USA
----- Original Message -----
From: "Clif Walker" <clif.gwr@xxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Tuesday, May 26, 2009 1:23 PM
Subject: [modeleng] Re: Valve Problem
> Hi All,
>
> I have never trusted vertical slide valves which can fall away from the
> face
> and have always fitted S/S springs between the bridle and the valve.ie on
> Pansy etc.
>
> Regards
>
> Clif
> ----- Original Message -----
> From: "Barrie Purslow" <bpduo@xxxxxxxxxxxxx>
> To: <modeleng@xxxxxxxxxxxxx>
> Sent: Tuesday, May 26, 2009 10:23 AM
> Subject: [modeleng] Re: Valve Problem
>
>
>> Hi Bede,
>>
>> Yes, I would have a few quid on you having got some debris underneath the
>> seating face of one or both slide valves. Regarding a possible solution
>> to
>> the problem - I have never tried this myself but I think it is worth
>> putting
>> an airline onto the blastpipe. This should lift the slide valves and,
>> hopefully, clear away the debris unless, of course, the debris has become
>> embedded in the seating faces.
>> The only other solution I can think of is the one you mentioned - a
>> stripdown. These sort of jobs are usually not quite as bad as the thought
>> of
>> doing it and you invariably sort out a few other potenetial problems
>> along
>> the way.
>>
>> Good Luck!
>>
>> Barrie
>>
>>
>> ----- Original Message -----
>> From: <bede@xxxxxxx>
>> To: <modeleng@xxxxxxxxxxxxx>
>> Sent: Tuesday, May 26, 2009 3:27 AM
>> Subject: [modeleng] Valve Problem
>>
>>
>>> Hi All,
>>>
>>> Looking for help troubleshooting my Martin Evans' "Conway", 3.5"
>>> gauge narrow gauge 0-4-0.
>>>
>>> Tried to steam the loco over the weekend and it raised steam ok to
>>> working pressure (80psi), but when I opened the regulator/throttle, the
>>> steam just whooshed directly up the blast pipe, no power to the
>>> cylinders at all in either direction, tried pushing the loco back and
>>> forth, but no luck.
>>>
>>> I have to admit that I did an idiot thing- the smokebox was full of
>>> cinders and ash and my steaming buddy and I took the lazy way out and
>>> tipped the whole engine upright to dump the debris out. I'm thinking
>>> now that this somehow caused one or both valves to become unseated which
>>> resulted in the steam just going straight out the exhaust port. This
>>> loco has outside cylinders with the steam chests inside the frames,
>>> Stephenson gear with the slide/D valves vertical against the port faces.
>>> But I can't imagine the valves coming away that easily, esp. as
>>> they're vertical...
>>>
>>> Any suggestions on what steps to take to remedy this, I really hope I
>>> don't have to strip the loco down...
>>>
>>> Thanks,
>>> Bede in breezy Brooklyn
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>>>
>>
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>
>
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