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Posted by Steve on June 12, 2008, 2:25 pm
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I've been asked to sort out a model of a lancashire mill engine and I can't
for the life of me understand how it was meant to work.
The engine is a single cylinder steam engine with the steam chest on top of
the cylinder. Instead of the usual single slide valve arrangement (a la
Stuart Victoria), it has two rods driven from individual eccentrics, but
the eccentrics throw is aligned ie there is no angular difference in the
throw of the eccentric. Through an arrangement of levers two rods for
operating the valve gear emerge one vertically above the other. At this
point the timing of the action has moved from being in phase to being in
anti-phase. The lower rod drives what appears to be a conventional slide
valve covering three ports, though its difficult to be absolutely sure
without stripping this down (I can't get at the underside of the valve).
The upper pushrod is connected to nothing in the steam chest, whatever
valve it was supposed to drive is long gone. There is too many hours work
in the model for all that assembly to be a dummy (assumption).
I've drawn a complete blank as to how this valve gear was intended to work
or what the missing valve looked like - hours of fruitless Googling has
revealed nothing like this.
So I've tried to sketch the valve chest side on
www.btinternet.com/~steve.withnell/lathe/chest.jpg
And provided this photo of the valve gear arrangement:
www.btinternet.com/~steve.withnell/lathe/pushrd.jpg
Any ideas gratefully received -
TIA
Steve
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Posted by dave sanderson on June 12, 2008, 3:21 pm
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> I've been asked to sort out a model of a lancashire mill engine and I can't
> for the life of me understand how it was meant to work.
>
> The engine is a single cylinder steam engine with the steam chest on top of
> the cylinder. Instead of the usual single slide valve arrangement (a la
> Stuart Victoria), it has two rods driven from individual eccentrics, but
> the eccentrics throw is aligned ie there is no angular difference in the
> throw of the eccentric. Through an arrangement of levers two rods for
> operating the valve gear emerge one vertically above the other. At this
> point the timing of the action has moved from being in phase to being in
> anti-phase. The lower rod drives what appears to be a conventional slide
> valve covering three ports, though its difficult to be absolutely sure
> without stripping this down (I can't get at the underside of the valve).
> The upper pushrod is connected to nothing in the steam chest, whatever
> valve it was supposed to drive is long gone. There is too many hours work
> in the model for all that assembly to be a dummy (assumption).
>
> I've drawn a complete blank as to how this valve gear was intended to work
> or what the missing valve looked like - hours of fruitless Googling has
> revealed nothing like this.
>
> So I've tried to sketch the valve chest side on
>
> www.btinternet.com/~steve.withnell/lathe/chest.jpg
>
> And provided this photo of the valve gear arrangement:
>
> www.btinternet.com/~steve.withnell/lathe/pushrd.jpg
>
> Any ideas gratefully received -
>
> TIA
>
> Steve
Since its a mill engine it wont need reverse, and thrifty(tight) mill
owners
wouldnt put extra into a machine for nowt.
Could it be some sort of inlet regulator?something that would allow
you
to 'notch up' the engine, a bit like the slotted link in a stevensons
gear?
Dave
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Posted by Mike on June 12, 2008, 7:16 pm
Please log in for more thread options Steve,
If one eccentric is for the slide valve in the steam chest, it may be the
other one is/was for a water pump. But that's only a guess.
Mike
> I've been asked to sort out a model of a lancashire mill engine and I
> can't for the life of me understand how it was meant to work.
>
> The engine is a single cylinder steam engine with the steam chest on top
> of the cylinder. Instead of the usual single slide valve arrangement (a
> la Stuart Victoria), it has two rods driven from individual eccentrics,
> but the eccentrics throw is aligned ie there is no angular difference in
> the throw of the eccentric. Through an arrangement of levers two rods
> for operating the valve gear emerge one vertically above the other. At
> this point the timing of the action has moved from being in phase to being
> in anti-phase. The lower rod drives what appears to be a conventional
> slide valve covering three ports, though its difficult to be absolutely
> sure without stripping this down (I can't get at the underside of the
> valve). The upper pushrod is connected to nothing in the steam chest,
> whatever valve it was supposed to drive is long gone. There is too many
> hours work in the model for all that assembly to be a dummy (assumption).
>
> I've drawn a complete blank as to how this valve gear was intended to work
> or what the missing valve looked like - hours of fruitless Googling has
> revealed nothing like this.
>
> So I've tried to sketch the valve chest side on
>
> www.btinternet.com/~steve.withnell/lathe/chest.jpg
>
> And provided this photo of the valve gear arrangement:
>
> www.btinternet.com/~steve.withnell/lathe/pushrd.jpg
>
> Any ideas gratefully received -
>
> TIA
>
> Steve
>
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Posted by Charles Lamont on June 12, 2008, 8:30 pm
Please log in for more thread options It looks as though it is intended to have an expansion valve.
I do not have time to explain right now.
--
Charles Lamont
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Posted by Charles Lamont on June 12, 2008, 8:32 pm
Please log in for more thread options
> It looks as though it is intended to have an expansion valve.
> I do not have time to explain right now.
>
On second thoughts, look at this:
http://oldenginehouse.users.btopenworld.com/expslv.htm
--
Charles Lamont
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> for the life of me understand how it was meant to work.
>
> The engine is a single cylinder steam engine with the steam chest on top of
> the cylinder. Instead of the usual single slide valve arrangement (a la
> Stuart Victoria), it has two rods driven from individual eccentrics, but
> the eccentrics throw is aligned ie there is no angular difference in the
> throw of the eccentric. Through an arrangement of levers two rods for
> operating the valve gear emerge one vertically above the other. At this
> point the timing of the action has moved from being in phase to being in
> anti-phase. The lower rod drives what appears to be a conventional slide
> valve covering three ports, though its difficult to be absolutely sure
> without stripping this down (I can't get at the underside of the valve).
> The upper pushrod is connected to nothing in the steam chest, whatever
> valve it was supposed to drive is long gone. There is too many hours work
> in the model for all that assembly to be a dummy (assumption).
>
> I've drawn a complete blank as to how this valve gear was intended to work
> or what the missing valve looked like - hours of fruitless Googling has
> revealed nothing like this.
>
> So I've tried to sketch the valve chest side on
>
> www.btinternet.com/~steve.withnell/lathe/chest.jpg
>
> And provided this photo of the valve gear arrangement:
>
> www.btinternet.com/~steve.withnell/lathe/pushrd.jpg
>
> Any ideas gratefully received -
>
> TIA
>
> Steve