Add time：15-07-17 17:16:06    Excerpt：www.othchina.com

　　Seals will fail to seal at some point, only a failure if this happens prematurely.

　　1 – Dry Running – no lubrication to seal faces causes heat build up and face wear. Faces no longer flat, seal leaks.

　　2 – Elastomer failure – chemical attack or heat.Elastomer no longer makes universal contact with surfaces,leak starts.

　　3 – Running faces not flat or contaminated. Always a drip on start-up when new. If faces are not flat or particles between faces, face no longer flat and will leak.