Top Entry Trunnion Valve for 615F Hot Oil Service

[aggieengineerrmb]

Does anyone know of a MFG or design for top entry trunnion valves that would be suitable for maximum operating temperatures of 615F in hot oil service? Metal-metal seats seem to be pretty much a given at these temperatures, but what I don't see is how the other joints, such as the body-bonnet, around the stem, and between the seat and body are going to be sealed. Some MFG's have talked about using high performance perfluourinated o-rings, but they don't seem to have a lot of real experience and I see that our operating conditions are at the very upper published limits of that material, so I am concerned that it might not be a real robust solution.

Any experience or ideas? We are hoping to find alternatives to the Orbit style as the price is very expensive.

 

[PeterIgg]

Questions:
Size? Pressure rating? Why trunnion mounted? - this makes life far more difficult as you then have two seals - body to seat and seat to ball.
Have you considered metal seated butterfly type if price is a consideration? (Or do you need to pig the line or have full bore for other reasons?)

 

[jay165]

Also, why top entry? My understanding is that most manuf. are phasing them out as nobody rebuilds valves in the field anymore.

 

[petergg]

The FCx Truflo valve has a top entry and tapered seats this valve is used in Cryogenic applications and also very high temp applications.

http://www.fcx-truflo-rona.com/