flch longueGalling

The solution …

In our laboratory, we use the ASTM G-65 test to screen anti-galling coating candidates with respect to their abrasion resistance, and the ASTM G-77 (block-on-ring) test to rank the sliding wear behavior of possible mating materials.

For gates and seats applications, galling-resistant coatings must meet stringent service requirements. In addition to ASTM wear tests, Praxair Surface Technologies developed a custom pressure-velocity (PV) test, which depicts gate and seat interaction. We recommend galling-resistant gate valve coatings based on the results of our PV test.

Desired galling-resistance characteristics and associated Praxair Surface Technologies coating solutions and application processes :