Early top mount double check valve

[NW Mailing List]

A check of drawings in the NWHS Archives revealed the following Location 
Numbers for drawings of double boiler delivery check valves with rear pipe 
connections:
    NW-C25014
    NW-D17778 (Note on drawing, "Replacing a Phillips.")
    NW-D46716
    NW-E17971
Details can be viewed by going to the following and entering the Locator 
Number in the field with that designation, and search:
    http://www.nwhs.org/archivesdb/filterdocs.php?index=search
Clicking on the record that comes up gives the price of the drawing and a 
link to Ordering Information.

These drawings are detailed enough that the N&W may have used them to 
manufacture boiler delivery check valves for locomotives constructed in 
Roanoke Shops and for replacement of OEM valves.

I hope this helps somewhat.

Gordon Hamilton
Member, NWHS Archives Committee

----- Original Message ----- 
From: "NW Mailing List" <nw-mailing-list at nwhs.org>
To: <nw-mailing-list at nwhs.org>
Sent: Tuesday, December 20, 2011 12:18 PM
Subject: Re: Early top mount double check valve



> Gentlemen,

> Jimmy and I have been working with Sunset/3rd rail on a model of the M 

> 4-8-0 and this is where the question about the top check valve originated. 

> I have looked through the 1906 Locomotive Dictionary and a 1925 Loco Cyc. 

> and have not found a drawing of a top check valve with rear pipe entry. If 

> anyone on the list has other Cyc editions, I'd appreciate it if you could 

> look for such a valve.

>

> Here is a drawing (courtesy of Jimmy's son) of what we think it looks 

> like: http://www.oscalemag.com/!models/TopMount.jpg

>

> Thanks

> Joe Giannovario

> O Scale Trains Magazine

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