SELECTING SEAT MATERIAL FOR BUTTERFLY VALVE

[wsuengineer]

I AM IN SEARCH OF A COMPATIBILITY CHART FOR PROPYLENE GLYCOL (DOWFROST HD) WHEN SELECTING SEAT MATERIALS FOR BUTTERFLY VALVES. SPECIFICALLY: EPDM, NBR, PTFE, SINCE THESE ARE THE MOST COMMON AND LEAST EXPENSIVE.

THANKS.

 

[JimCasey]

I thought I posted this yesterday, but it's not there:

http://www.upchurch.com/TechInfo/chemMatList.asp?vChem=Propylene Glycol

There are more sites also.
One is on Flowserve.com. Download Durco technical bulletin DVATB0004 from the Literature section.

 

[wsuengineer]

I found two excellent sources for o-ring material compatability.

http://www.parker.com/o-ring/fcg/fcg.asp

http://www.bray.com/apps/braymat/braymat.cfm

EPDM is recommended for PG.

 

[wsuengineer]

JIMCASEY, I was unable to locate the durco technical document DVATB0004. Will you help me find it.

Thanks,

 

[Sbelt]

Another excellent material compatibility chart for valves.

http://www.nibco.com/assets/ChemGuide.pdf

 

[vpl]

wsuengineer:

go to

http://www.flowserve.com

There's a box on the left hand side which says "Literature."
Scroll down until you get to document.



Patricia Lougheed

Please see FAQ731-376 for tips on how to make the best use of the Eng-Tips Forums.

Want to post an image? Look at the FAQ's in forum559

 

[wsuengineer]

PROBLEM: CONFLICTING MATERIAL COMPATABILITY FOR 60ºF-130º AT 100PSIG PROPYLENE GLYCOL (DOWFROST HD.

SOURCE
AST, MECHANICAL SEAL MATERIAL SELECTION GUIDE
NBR:NO
EPDM:NO
VITON:YES

SOURCE
CHEMICAL RESISTANCE GUIDE FOR ELASTOMERS II
NBR:YES UP TO 250ºF
EPDM:YES UP TO 70ºF
VITON:YES UP TO 140ºF

SOURCE
NIBCO CHEMICAL RESISTANCE GUIDE FOR VALVES AND FITTINGS
NBR:YES UP TO 180ºF
EPDM:YES UP TO 70ºF
VITON:YES UP TO 140ºF

SOURCE
CAT PUMPS, CHEMICAL COMPATABILITY GUIDE
NBR:YES
EPDM:N/A
VITON:YES

SOURCE
MCNALLY INSTITUE, O-RING SELECTION
NBR:YES
EPDM:N/A
VITON: N/A

SOURCE
GEORG FISCHER, CHEMICAL RESISTANCE
NBR:YES UP TO 68ºF
EPDM:YES UP TO 104ºF
VITON: YES UP TO 104ºF

SOURCE
COLE-PARMER, CHEMICAL COMPATABILITY
NBR:YES
EPDM:YES
VITON: YES

SOURCE
BRAY CONTROLS, MATERIAL SELECTION GUIDE
NBR:YES
EPDM:YES, PREFERED
VITON: YES

SOURCE
PARKER SEALS, FLUID COMPATIBILITY GUIDE
NBR:NO
EPDM:YES
VITON: NO

SOURCE
VIKING, TECHINICAL DATA, FIREFIGHTER ELIMINATOR C
NBR:YES
EPDM:YES
VITON: YES


WHICH WOULD YOU SELECT. I WOULD RATHER GO WITH EPDM OR NBR INSTEAD OF VITON DUE TO THE COST.

 

[JimCasey]

wsuengineer: The Durco bulletin is here:

http://www.flowserve.com/vgnfiles/Files/Literature/FPD/bulletin_a4.pdf