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  1. ballvalveguy

    Corrosion resistance of Inconel 718, Inconel X750 and Incoloy A286 with dilute sulphuric acid at 70C

    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...
  2. ballvalveguy

    MAST (Maximum Allowable Shaft Torque)

    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?
  3. ballvalveguy

    Valve Testing API 598

    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.
  4. ballvalveguy

    Supplier of Small Valves for High Temperature Service

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

    Ball Valves with Solid Tungsten Carbide Trim

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

    metal to metal

    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...
  7. ballvalveguy

    Valve Testing API 598

    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...
  8. ballvalveguy

    metal to metal

    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...
  9. ballvalveguy

    High Temp Valve Manufacturer

    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)
  10. ballvalveguy

    Double Block and Bleed Valves thread408-48267

    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
  11. ballvalveguy

    H13 tool steel

    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...
  12. ballvalveguy

    H13 tool steel

    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?
  13. ballvalveguy

    tungsten disulphide as an anti-galling agent on stainless steel

    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...
  14. ballvalveguy

    valve body thread leak

    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...
  15. ballvalveguy

    Manufacturer of DN50, PN40 trunnion mounted Ball Valves ?

    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
  16. ballvalveguy

    HVOF vs Spray and fuse coatings

    While I'm at it, can someone tell me about PVD and CVD coatings? How are they applied, how are they different and what are their advantages?
  17. ballvalveguy

    HVOF vs Spray and fuse coatings

    I am curious to know the difference between a spray and fuse coating and an HVOF (high velocity oxygen fuel) coating, Can you spray any coating (e.g tungsten carbide, chrome carbide) on to any base metal (410 stainless, Inconel)? How is the process done? What are the advantages of one over...
  18. ballvalveguy

    Valve for high pressure , high viscosity, highly abrasive enviroment

    I'm not sure how Gosco would work on high viscocity material, but these high end companies (VTI, Mogas, Argus etc) should be able to solve your problem. You're right about the price though. Depending on what valve manufacturer you're using right now, you could be 3-4 times the price. You tend...
  19. ballvalveguy

    MAXON VALVE MAINTENANCE

    Hi Saparna, Do the valves need to be FM approved. As far as I know, only Gosco www.mclassvalve,com has a double block and bleed valve that is FM approved. I would definitely put Jamesbury as a higher quality valve than Maxon. What maintenance needs to be done?
  20. ballvalveguy

    Dissolving stainless in dilute sulfuric acid

    We use Alloy 20 on our ball valves for sulphuric. It works from concentrated to dilute up to about 200F. It is not that much more expensive than 316 stainless steel.

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