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Does anyone know of a reason that it would be unwise to use carbon steel for ball valve bodies when used in an oxygen service environment? The valves, of course, would be cleaned and degreased, and we are talking about industrial O2 services, not breathable O2. We have an old (20+ year) note...

We are considering modifying one of our standard, API 6D flanged floating ball valves for use in a cryogenic application with the potential for temperatures as low as -150F. It's a shutdown valve going in front of a relief valve. Normal operating temperature is literally ambient, however in...

We are considering modifying one of our standard, API 6D flanged floating ball valves for use in a cryogenic application with the potential for temperatures as low as -150F. It's a shutdown valve going in front of a relief valve. Normal operating temperature is literally ambient, however in...

Although I know what a helicoil is, I don't understand what "helicoil by design" means. Can you elaborate?

What are some well accepted standards for industrial and oilfield equipment (pressure containing vessels) for thread engagement of HHCS's. In this particular case, I have a 1/2-13 Grade B7 (105 KSI yield) HHCS threaded into a cast steel (WCB with 40 KSI yield) part. How far should the thread...

Thanks for the valuable information and insight provided so far. It does help a great deal. One question however, how does the formation of ice cause potential problems with the stem seal as PeterIgg mentioned. I'm sure you are correct, as I have seen pictures of valves covered in ice, but I...

I have a very low temperature application, -70F, which may not be truly cryogenic, but appears below the level that most valve companies are experienced. It will almost never see those temperatures, the vast majority of the time it will be above freezing. We have had some companies come back...

Does anyone know of a supplier who offers small bore (1-4") floating ball valves suitable for subsea service to depths as deep as 5000 ft? I've had been pointed in the direction of Cooper-Camereron, but all they had were typically larger bore, trunnion style ball valves that were extremely...

I have heard that it is difficult to find ball valves that work well in concentrated peroxide applications. I can see that it would be difficult to find standard elatomers that are compatible, but what are some of the other issues that users have found that I should be aware of when making a...

Does anyone have some ideas about what grease should be used on ball (floating or trunnion) valves when exposed to natural gas? I understand many tradition greases will react and harden over time, which increases valve torque and likelihood of seat leakage.

A trunnion supported ball valve, instead of a floating ball valve like you are getting from Balon, is the way to go. Balon does not offer a trunnion style valve, but looking at the KF Industries catalog, their 4" FP trunnion valve has an operating torque about 50% lower than their comparable...

Does anyone know of a good procedure to follow if you were going to "rate" a valve as suitable for vacuum service? I'd like to send some to an independent lab for testing, but need a good procedure to follow. I can easily pull a vacuum against a closed ball and see just how low it will go, but...

zdas04 - Thanks for the reply, but I don't think I agree with you 100%. While it's true that most trunnion valves seal upstream initially as a result of a force pushing the seat into the ball exterted by a compressed spring, the seat seal is also affected by the dP across the seat. The higher...

Can a standard, soft seated trunnion ball valve be used in a vacuum service? I hear that these types of valves often have trouble sealing bubble tight at relatively low pressures, say 80 PSI, and if true it seems like vacuum service would only compound the problem. The other side of this would...

Does anyone know what the expectations are in the industry for sealing quarter-turn, trunnion mounted ball valves when using PEEK as the materail for the seat? All the valves I am concerned with are API-6D complaint, and I know that this standard requires zero leakage between the ball and seat...

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...

I should have mentioned this in the original message thread, but my question strictly involves suitability of the modified PTFE seats when used on floating ball valves.

Does anyone have any experience using valves with modified PTFE seats in typical oilfield services that may have some abrasives like sand present? The molecularly enhanced PTFE is simply PTFE that has a small amount (less that 1%)perfluoropropylvinylether (PPVE) added, which has no affect on...

What is the difference between a General Arrangement drawing and a General Assembly drawing for a component like a valve or a pump? I guess I have always used these terms interchangeably and called them both GA drawings, but I see that some vendors differentiate them.

You might also want to consider operating your PD pumps with a VFD equippped electric motor and using the output signal from a pressure transducer to adjust the speed, therefore capacity, of the PD pump to compensate for the varying conditions and maintain a constant discharge pressure...