DIB-1 seat configuration

[Discosis]

Hello,

I'm in a non technical role but love this forum and some of the advice. RIght now I'm comparing two DIB-1 ball valves, where one is primary metal-to-metal seal and secondary synthetic o-ring seal, spring energised. The second uses a elastomeric "delta" o-ring with a scraper seat design.

My gut reaction is that metal to metal is more trustworthy, but I would be curious to hear feedback. Both valves are considered high quality in the market.

What are your thoughts? Thanks for feedback!

 

[LittleInch]

Depend son fluids, service ( on off or closing or opening under pressure differential) and how you seats are configured.

Oh and what leak level you want.

where's the secondary seal on the M-M seal? If inserted in then they can rip out under differential pressure and then the seal is useless.

Similarly your Delta o ring seal may not last if you have grit or sand.

A few diagrams or drawings of the seal arrangement would be good plus some service data ( pressure, temperature, fluid, mode of operation etc



Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Discosis]

Thanks for the quick reply!

First metal to metal seat is attached as VLTfeatures, second delta valve is attached as GVS features.

The comparison is being done for a number of media/pressures, but ideally would be looking at high pressure gas, with both high and low sour content. We're also looking at a few oil only applications, but I don't know much more on that side.

Typically temperatures can get down to about -40 C, nothing too crazy on the high end.

I'm unclear on what you mean by leak level. Could you clarify? Both valves would have a drain attached to relieve pressure in the ball if that's what you mean?

Seats are preferred to be configured as DPE x DPE. There is some talk about the Delta ring valve as havhing interchangeable seats, which the metal to metal does not.

Thanks for the feedback!

 

[Discosis]

2nd attachment