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@ gerhardl: That is exactly what I began with ;-) But even with this, I was hurting myself to the same thing again and again. And thanks for the luck :-)

Many thanks, this is an approach I didn't think of!!!

Thanks BigInch. But then what concerning the seals, trunnions bearing (these are ball valves),... Which class should they follow?

Hi all. My question will certainly look like evident for some people. I'm currently beginning design of subsea valves. I read several standards, but there is something I can't fix about the class pressure. What I retained is that the design has to follow a pressure class as any other valve...

Thanks for those answers! SJones: isn't API 6DSS equivalent to ISO 14723?

Hello all. I hope I post this message at the right place... I am currently benchmarking to get a foot on the subsea valves market. My boss would like to promote this new project. I found some general informations I needed (constructors, standards like the new API 6DSS,...), but I'd like to...

It is probably due to the design of the valve, which prescribe no leakage in a particular direction. The pressure of the fluid may be used to push down the disc against the seat, to have a zero leakage capability in that direction, which would not be true if the fluid tends to take the disc...

As far as I know, the standards are effectively not that clear. In fact, in my industry, we use rules of thumb to calculate this length in cryogenic applications. Some basic calculations were done in R&D some years ago, and then in function of fluid used, size of the valve and materials, we...

Thanks a lot! I'll try this right now, and be back to let you know how it works!

Maybe I should add some details, in order to have some directions where to go: The general test is the following: I add pipes at the inlet and outlet of my CAD model (2 times the ND at the inlet and 6 times the ND at the outlet, following ISA S75-02), then I apply some pressure at the inlet...

Hello all, I'm new on this forum, and quite new also in the valve world. Since last july, I (try to) handle a Fluid Finite Elements Analysis software to do flow calculations through the valves I design. In particular I'd like to use it to determine CV. But the more I try to understand, the...