Seal extrusion occurs when pressure forces seal material into the clearance gap between hammer union halves, potentially causing seal damage or complete failure. High differential pressures across the seal, combined with excessive clearances from worn unions or improper size matching, increase extrusion risk. Anti-extrusion rings, typically made from PTFE or polyethylene, can be insta... https://globalsealstech.com/product/hammer-union-seal-2/