Locos at Clare OH early 1900s

[NW Mailing List]

Didn’t top checks become standard in the later years of steam?

pete groom
> On Aug 10, 2016, at 9:13 AM, NW Mailing List via NW-Mailing-List <nw-mailing-list at nwhs.org> wrote:
> 
> Hi, Bud.
> 
> I have heard that too and it sounds logical. I also read someplace that the top CV (supposedly invented by the N&W) was also less stressful to the boiler as to thermal shocks when the cooler water was injected. That also sounds logical.
> 
> Roger Huber
> Deer Creek Locomotive Works
> 
> 
> From: NW Mailing List <nw-mailing-list at nwhs.org>
> To: NW Mailing List <nw-mailing-list at nwhs.org> 
> Sent: Wednesday, August 10, 2016 10:10 AM
> Subject: Re: Locos at Clare OH early 1900s
> 
> The reason that N&W used boiler top check valves was for safety.  If a locomotive was involved in a wreck, there was a tendency to shear off the side boiler check and having it on top reduced that risk.
>  
> Bud Jeffries
>  
> From: NW Mailing List <mailto:nw-mailing-list at nwhs.org>
> Sent: Tuesday, August 09, 2016 8:10 PM
> To: NW Mailing List <mailto:nw-mailing-list at nwhs.org>
> Subject: Re: Locos at Clare OH early 1900s
>  
>> I don't have any information as to whether it helped or not.
> Jim,
>     Again, "You can read about it in the N&WHS Newsletter Vol.6, No. 1, Jan. - Feb. 1990."
>  I think the practice first started in England as I have read of it being used on the "Saint" Class 4-6-0 locos around 1902. While the exact appliance may not have survived, the principle did, in that it did help preheat the water entering the boiler. And, it must have worked well enough that the N&W went almost exclusively to top mount check valves.
> 
> Jimmy Lisle
> 
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