HOW IT WORKS
E.S.P (Elastic strain preloaded) Technology

During installation, the axial movement of the LOKRING™ driver over the body swages the body onto the pipe surface, compressing the pipe wall first elastically and then plastically. The pipe wall resist this swaging action, generating high unit compressive loads at the contact points between narrow sealing lands inside the fitting body and the pipe surface.

These contact stresses are sufficiently high to plastically yield the pipe surface under the multiple sealing lands, forming a 360° circumferential, permanent, metal to metal seal between the pipe and fitting body. The driver, which experiences a small increase in diameter (elastic strain) during installation, exerts an elastic, radial pre-load on the metallic seals for the life of the connection.