A general definition of the trim is the 'wetted internal parts' of the valve. The trunnion and stem are both wetted by the fluid in a ball valve. The trim material selected is normally better in corrosion / erosion resistance. The other consideration for stem and trunnion is the material strength.
Sajit Viswan
AUH A353 NBAD 22 FL,
611 6351
ADA07730 / AE001WD1795
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Received on Wed Oct 03 02:34:00 2007
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