[urq] By-pass vavle ?

[dgraber460 at aol.com]

What is the conventional wisdom regarding the cleaning and (if any) lubrication of the aluminum by-pass valves? Any lube that won't interfere with sensors etc or gum up with use? Maybe a graphite dry type? 
I have a Forge AL valve that needs to be periodically cleaned, and if left dry seems to be have a little drag in operation. The machining and quality of this valve is very good and I might be getting another as I have 3 oem plastic valves that are all ruptured. I have seen posts where many listers recommend the oem units, but they don't seem to hold up for me.
TIA. Any advice appreciated.

Dennis 
Denver