Would like to but do not have a lathe. I will look at the one I have on one of my locomotives, take a photo, and get back to you all.
BTW, in the 1:1 world, was there a valve inline with the boiler check valve?
Would like to but do not have a lathe. I will look at the one I have on one of my locomotives, take a photo, and get back to you all.
Most locos (maybe all) had a shutoff valve either incorporated in the check valve or between the check valve and the boiler. That's what makes a boiler check valve different from an ordinary check valve. Check valves stick, it's a good thing to be able to either shut them and/or service them without dumping boiler pressure/water back through the feedwater system.
He's right. In the grand scales world, it's hard to find reliable check valves anymore. We've tried the original bronze-valve on bronze seat swing check valves, and we've tried bronze seat and PTFE insert poppet style checks, and all require some form of maintenance sooner or later. the PTFE works real well, when you have nothing but CLEAN water. No sediments. The slightest piece of debris will embed itself in the PTFE and it will be just enough to hold the seal off of the seat and leak steam and eventually water. But at least they're serviceable. We have a ball valve right between the check and the boiler, and let me tell you - it is a godsend when it comes to servicing! Ten minutes (provided you have the replacement insert and proper tools on hand) is plenty of time to pull the poppet, replace the seal, and put it back together.jcbrock wrote: ↑Thu Mar 07, 2019 11:02 pmMost locos (maybe all) had a shutoff valve either incorporated in the check valve or between the check valve and the boiler. That's what makes a boiler check valve different from an ordinary check valve. Check valves stick, it's a good thing to be able to either shut them and/or service them without dumping boiler pressure/water back through the feedwater system.
Don, see my PM to you about this.Don at the farm wrote: ↑Thu Mar 07, 2019 5:08 pm I’d like a top mount double check with diffuser for a 1-1/2” scale project. Any thoughts? Anyone ever make one from a drawing?
Even commercially?
A Nathan Type T would be nice but not picky at this point.
Don
What's left of my memory wants to think that there was an article about this in one of the magazines: Live Steam, Model Tec? Anyone know for sure?Pontiacguy1 wrote: ↑Fri Mar 08, 2019 2:49 pm I've also wondered if anyone ever made the top-mount double check valve in 1 1/2" scale. The N&W used them on their locomotives, retrofitting some of them during their service lives from the traditional side-mounted checks.