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Grease / Water Treatment Compatibilty

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jpyeck

Mechanical
Oct 18, 2004
12
US
I have some ball valves in my system that have started to exhibit higher torque requirements to actuate. I took a couple apart to see what was going on, and noticed that the stem and O-rings seemed rather "dry". The grease appeared to lose all it's lubricating qualities, although it was obvious that it was still there.

The manufacturer says the valves are made with a synthetic grease (Kluebersynth VR 69-252) and EPDM O-rings. We used a sodium nitrite based corrosion inhibitor on the system. Our medium is ethylene glycol/water (50/50).

Is it possible one of these chemicals is reacting with the grease to cause this "drying out"? Any suggestions for other types of grease?
 
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Yeckelch,
try consulting the websites mentioned in Thread408-104579: maybe you'll find some information about the lubricants' chemical compatibilty...
Bye, 'NGL
 
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