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Side-Mounted Tank Car Dome Safety Valve(s)

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  • Member since
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Side-Mounted Tank Car Dome Safety Valve(s)
Posted by staybolt on Thursday, January 21, 2021 11:22 PM

I want to back date the dome safety valve design on an HO tank car that has the valves seated in the top of the dome. Cars with the side-mounted valves were, as far as I know, built prior to the 19-teens. The two valves types are very different in design, so it wouldn't be prototypically correct to simply move the existing top-mount valves to the side of the dome. So....this would involve either finding a company that makes complete domes with such valves, or one that makes just the valves that could be added to the side of the dome on the car I have. If the latter was the case I would remove the existing top-mounted valves. 

Anybody know of a source? Here's a photo of a car with side-mounted dome valves:

 

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Posted by mbinsewi on Friday, January 22, 2021 7:16 AM

I don't see your picture, I get an error message.

There is a "sticky note" on how to post pictures on the top of the General Discussions forum.

Our you talking about what is pictured in this link?:

http://modelingthesp.blogspot.com/2017/01/frangible-safety-vents-on-tank-cars.html

Scroll down for different styles.

Mike.

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Posted by staybolt on Friday, January 22, 2021 1:36 PM

Mike,

Hey, thanks for noting the problem. The photo image was at the bottom of my text yesterday when I first posted. I used the railimages.com site to transfer the photo from that site (where I originally placed it, per site instructions) to my post on this forum. Don't understand why it would appear one day, then disappear the next. I used railimages.com because someone else on this forum evidently uses it regularly with success. 

I'll see if I can figure out what happened, but meanwhile, much thanks for the "Modeling the SP" link. It led me to Owl Mountain Models which has the side-mounted, spring-loaded twin valves. Since they're cast brass, though, they're expensive, so I'd like to see if I can find them in plastic.

               -Chuck

 

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Posted by staybolt on Friday, January 22, 2021 6:11 PM

Here's another try for a link to the photo I cited in my initial post:  file:///var/folders/08/ntvvtv4d3x55ffw2nl3hs74m0000gn/T/com.apple.Safari/WebKitDropDestination-LHD8zsio/Tank-Car-P66Presentation-3-10-14_2.jpg

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Posted by gmpullman on Friday, January 22, 2021 6:29 PM

Lots of great tank car photos can be found at the John W. Barriger library at Flickr.

 164 001 by John W. Barriger III National Railroad Library, on Flickr

 8696 001 by John W. Barriger III National Railroad Library, on Flickr

 8738 001 by John W. Barriger III National Railroad Library, on Flickr

 lot 7391-3 by John W. Barriger III National Railroad Library, on Flickr

 

The old Roundhouse "old timer" tank car has an offset relief valve. A single, I believe.

 Gramps_sm1 by Edmund, on Flickr

With the lack of train shows I doubt you could find the valve or even the dome as a separate piece. eBay sellers are probably only offering complete kits? It appears the elbow and valve are molded as part of the tank and dome:

https://www.ebay.com/c/1220985070?iid=254816869734

 

Good Luck, Ed

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Posted by staybolt on Friday, January 22, 2021 6:51 PM

Here's an attempt to change the URL to a hyperlink:

file:///var/folders/08/ntvvtv4d3x55ffw2nl3hs74m0000gn/T/com.apple.Safari/WebKitDropDestination-LHD8zsio/Tank-Car-P66Presentation-3-10-14_2.jpg

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  • From: Shenandoah Valley
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Posted by BigDaddy on Friday, January 22, 2021 7:17 PM

staybolt
Here's an attempt to change the URL to a hyperlink: file:///var/folder.........

This might be an address on your computer but it is not an Internet address.  Look at the address bar in your browser.  This is cs.trains.com/mrr etc etc.  We are not supposed to post copyrighted pictures from places like:

https://www.railpictures.net/

Links to sites in the public domain, like the National Archives https://www.archives.gov/files/research/american-west/images/west-cover-m.jpg are ok and there are the picture hosting sites

https://imgur.com/

https://www.flickr.com/

Henry

COB Potomac & Northern

Shenandoah Valley

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Posted by staybolt on Friday, January 22, 2021 7:31 PM

Ed,

I appreciate the photos you included. I posted the URL for the photo I had and was trying to make a hyperlink from it, but with no success. I think The Miranda Sugar Company car photo you posted has the best view of the twin valves. As I said in an earlier post, the Owl Modeling Co. sells the valves separately in brass, but they're expensive, especially when shipping cost is added. So....I'm hoping someone may come up with a source for the valves in plastic.  

 

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Posted by staybolt on Friday, January 22, 2021 8:07 PM

Henry,

Thanks for your notes about hyperlinks and copyright. I found the photo for which I was trying to create a hyperlink by a simple Google search for photos of tank cars from the 1910-1920 period. Evidently Google has not received a "complete and valid takedown notice" (Google's term) from any copyright holder there may be for the photo so the photo still appears. 

         -Chuck

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Posted by doctorwayne on Saturday, January 23, 2021 9:06 PM

staybolt
As I said in an earlier post, the Owl Modeling Co. sells the valves separately in brass, but they're expensive, especially when shipping cost is added. So....I'm hoping someone may come up with a source for the valves in plastic.

Unless you're modelling in G scale or maybe live steam with ride-on locomotives, a few valves, even done in brass, shouldn't break the bank.
I don't think that it would be all that difficult to make your own valves, using brass or phosphor-bronze wire, and perhaps some styrene rod and/or tubing. It all depends on how much you want 'em.

Wayne

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