125" brass valve question

[thewellguy]

Hi All,
The more I read on different sites the more confused I get. A standard of the shelf full port 1.25" brass ball valve from any of the big box stores comes with a tag on it that read "600 WOG 150 SWP." I have read that the valve is rated for 600 psi on the net and that seems unlikely to me based on the 300# flanged fittings I have seem. My question is this. What is the rated working pressure of the above valve with water at temps between 30 and 90 degrees F ?

 

[PEDARRIN2]

thread408-27676

 

[PEDARRIN2]

Also do a forum search for "WOG". There are many threads that will answer this question.

 

[bimr]

SWP: Steam Working Pressure: This designates the maximum recommended steam pressure a product can operate at.

CWP: Cold Working Pressure: This designates the maximum non-shock pressure a product can operate at. “Cold” is generally defined as a range between -20°F to 100°F.

WOG: Water, Oil and Gas: This was an older, generic pressure rating call-out which has been largely replaced by CWP (see above). In this designation, “Gas” refers to any non-flammable, compressible fluid in a gaseous state. It does not imply a product’s suitability or third-party approval for use with flammable gases. Similarly, in this designation, “Oil” does not imply a product’s third-party approval for use with any petroleum products.

http://www.nibco.com/FAQ/Tech-Services/

600 WOG is 600 psi maximum for gas-oil-water.

The rating of the valve is one aspect and other aspects are the quality of the components and design. Different valves with the same cold working pressure rating may not have equivalent performance.

 

[LittleInch]

ANSI class 300 rating goes to >700 psi at ambient temps. Why is a 600 psi valve "unlikely".

The confusing thing to me is what the 150 represents - the SWP?? or the flange / class rating of the valve. In which case what is the 600 doing there??

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[btrueblood]

The steam working pressure is also a temperature limit - 150 psi of steam will occur at a temperature pretty close to 350 F, which is a typical upper working limit for some seal materials in steam.