Recent content by ballvalveguy

I am aware that these three metals are not great with sulphuric acid, but I need to specify a spring material that will work in this application. I picked what I consider to be probably the best choices, but if anyone can give me some insight in to which would be the best material to use, I'd...

Does anyone know of an official test to determine the MAST of a ball valve? Should the test be done at the maximum temperature rating of the valve?

Contact Yarmouth and speak to Matt (207) 829-5359. He actually does testing and can certify valves. He will be able to answer all your questions.

Try Gosco Valves, they have a ceramic option for that temperature range.(905) 825-2627http://www.goscovalves.com

If you're looking for someone to manufacture just the balls, try Ballco (800) 848-8854

If the problem is abrasives in the natural gas (black powder), there are soft seats that are far more abrasion resistant than Teflon. I would look at Devlon or even UHMWPE. Both are much less expensive than metal seats. Check out www.goscovalves.com, www.mogas.com or www.valv.com All these...

Hi Valvman52, Different metals have different strengths. Castings are the same thickness. Therefore a casting made of A105 for example would be able to hold a higher pressure than one made of 316. Most people are unaware of that because the majority of valve manufacturers only make castings...

Hi PVVGNI, There would be two reasons to go to metal seats on this application: 1). It is very abrasive (although there are some instances where you could use a "soft" abrasion resistant seat. 2). The temperature is above about 500F. What is the gas? What is the pressure? What is the...

If it's ball valves, try Mogas, Valvtechnologies, Argus or Gosco Valves. All of them should be able to handle those temperatures (600C or 600F)

Hi JWTweed, There are a few manufacturers out there who make DBB valves. The best know is probab ly Cooper Cameron's General twinseal valve. www.saas.no/Portal/DesktopModules/ViewDocument.aspx?DocumentID=242 You could also contact Gosco valves. www.goscovalves.com

I am looking for a material for the ball and seats for a metal seated ball valve. I will be boronizing them to increase the surface hardness, but I don't want a material that will "warp" with temperature fluctuations or at high temperatures because that will affect the sealing of the ball and...

I am looking for an inexpensive metal that is stable at high temperatures (to 1500F). I was lookinf at Inconel 718, but they seem to be too expensive for my application. Looking at H13 tool steel, the price seems right, but does anyone know how it compares to Inconel 718 at high temperatures?

The problem with stainless steel is it has a low galling threshold. If you harden the surface, that will increase the galling threshold, and prevent it from galling. There is a diffusion process for stainless steels that is proprietary to bodycote. It is relatively inexpensive and will solve...

Hi Iainuts, You seem to have a lot of experience with cryogenic applications and I have a question (for you or anyone else in this forum) about the pressure relief hole in a ball valve. My understanding was that the pressure relief hole should be in the stem slot (to relieve pressure between...

KTM also manufactures din drilled flanges, however, they do not meet DIN face to face measurements. They're a very high quality valve, but delivery is usually quite long. http://www.tycoflowcontrol-na.com/brands_results.asp?Selection=KTM