Ball valve pressure rating
Ball valve pressure rating
(OP)
Hi members
In one of the applications we have specified the ball valve 1 in size SS316 as 150# rating. On the valve body 5000psi rating is embossed.
Are the two pressure equivalent? how do we correlate the two?
regards
sree
In one of the applications we have specified the ball valve 1 in size SS316 as 150# rating. On the valve body 5000psi rating is embossed.
Are the two pressure equivalent? how do we correlate the two?
regards
sree





RE: Ball valve pressure rating
Comeback with exactly what you called out for the valve and the service it will be used in, temperature and pressure.
If you can give us all the information on the valve.
RE: Ball valve pressure rating
John
RE: Ball valve pressure rating
my opinion is that, you may double check on your system requirement, and see whether do you really need 5000psig, if you need 5000psig, then i suggest you change your flange class to higher class, may be class 2500, or may be you can change to a NPT thread, an 1" female NPT thread will have rating to 4400psig for SS316.
Another option is may be you can use a double ferrule compression end connection by using a SS tubing, an 1" OD SS316L tubing with 0.12" wall thickness can stand up to 4700psig. fitting like Swagelok, can stand pressure as high as the tubing rating.
RE: Ball valve pressure rating
If you are a psi type person think of one bar as about one atmosphere instead of the precise conversion. I don't think that Class 150 quite makes 300 psig in any material. If I buy a 1/2-inch Whitey Valve or Swagelok fitting for a class 150 system the valve would be rated much higher, perhaps 5000 psig. However, if I buy a 3/4-inch line class ball valve from Bonney Forge it may only be rated 800 psig. The eight-inch class 150 ball valve is likely rated something under 300 psig.
John
RE: Ball valve pressure rating
Without straining too hard, you can find an excerpt from ANSI (Now ASME) B16.5 or B16.34 in the technical section of most pipe-valve-fittings catalogs. Or maybe your company actually has a copy of the standard in the Engineering library. Both standards have charts of rated pressures of various ferrous materials at a range of tempreatures.
As pointed out in an earlier post: A 5000 psi ball valve >may< have really hard seats that require more than class 150 pressures to seal tightly. But at least the seats won't extrude at 5000 psi.