COUPLING WITH SEAL WITH RETRACTABLE CENTRAL LEG Russian patent published in 2020 - IPC F16L21/06 

FIELD: pipelines.

SUBSTANCE: invention relates to a coupling for connection of pipeline elements, which has segments surrounding central space, with tips, which are engaged with segments of seal to support segments at distance from each other in pre-assembled state. While the coupling is in a pre-assembled state, the pipeline elements can be inserted into the central space without disassembling the coupling, and sealing parts nearby fasteners on segments sit in channel formed by segments between tips. When seal is compressed between segments and pipeline elements to form joint, seal is deformed to pull central seal stem from flow path formed in pipeline elements.

EFFECT: invention provides deformation of the seal with retraction of the central leg in the direction from the central space.

11 cl, 8 dwg