Just the valve? Not the pump unit as well? I have had some pumps with some noise before, but never a valve issue. There is a softener we use from CAT that is for hydraulic systems, helps with packings and smoothes out twinposts that sometimes have dry seals that cause some chatter.
Keep us updated, I am a new install adjuster, work on 5-7 new I-2's a week or so.