Thanks for the information WESHardmetal! Great web-site.
But I'm not looking for solid tungsten carbide components.
I'm looking for information about the different properties of Tungsten Carbide thermal spraying vs. stellite overlay welding.
AKA milanflyer@ http://www.valvezone.com
Who can tell me advantages and disadvantages with stellite or tungsten carbide hardfacing?
Item is a trunnion mounted ball valve, hardfacing on ball and seats.
AKA milanflyer@ http://www.valvezone.com
Thank you russoint for your input.
I have investigated a little bit further.
The valves are made of WCB-material according to ASTM A 216.
This material shall be tested according to ASTM A 703.
In ASTM A703 chapter 11.1, they specify a hydrostatic test of the casting.
I assume this will lead to...
Here is the link to the book that MortenA is talking about:
http://www.documentation.emersonprocess.com/groups/public/documents/book/cvh99.pdf
AKA milanflyer@ http://www.valvezone.com
Agree with zdas04, that is a tough one!
Statoil (Norwegian oil company) have made a valve selection manual to be used for their projects.
Not to much info on why they have concluded as they have, but a lot of information on what type of valve to use in different services.
The link...
In Statoil TR2000 you can find valve-specs with API rating 15.000 psi.
VDS GIMX202G is a gate valve with design code API 6A and a rating of 15.000 psi.
AKA milanflyer@ http://www.valvezone.com
Thanks for your reply Intotherain.
The main question is still:
Why do we have to pressuretest a lined valve without paint?
AKA milanflyer@ http://www.valvezone.com
If you buy a lined butterfly valve according to API 609 cat A, the valve shall be tested according to API 598.
API 598 say that pressure testing shall be done before painting.
But this makes no sense for a lined valve with the liner as sealing surface against the flanges of the pipes.
If you get...
re dbaird;
No, this has nothing to do with fail safe action.
The valve is fail safe close.
re Joesteam;
The design in question here will not result in the valve stem in the main flow area. This is a slab gate. It's a plate with a hole in it. When the gate is down, the hole matches the...
If I have understood this correctly, in reverse acting gate valves, you pull the plug up to close the valve. Gate down = open valve.
What are the benefits of such a design?
In what kind of aplications is this valve used?
