PULL-UP BY TORQUE FITTING WITH COMPRESSIBLE MEMBER

摘要

A ferrule type, flareless fitting is provided that may optionally be pulled-up to its assembled condition by torque rather than by turns. In one embodiment, at least one fitting component includes a structure that facilitates pull-up by torque and allows the fitting to be remade. The structure may take a wide variety of different forms. Examples of fitting component structures that facilitate pull-up by torque and allow the fitting to be remade include, but are not limited to, deformable or compressible devices or structures that are configured to increase the torque required to further tighten the fitting components when the fitting is properly pulled up, resiliently deformable structures that bias a tube gripping device into engagement with a conduit when the fitting is remade to an initial pull-up position, and plastically deformable retaining structures that maintain a tube gripping device in sealing engagement with a conduit when a fitting is disassembled.

主权项

1. A conduit fitting for a conduit end, comprising:
a first coupling member comprising a threaded body having a camming surface; a second coupling member comprising a threaded nut having a drive surface, wherein said second coupling member and said first coupling member when joined together provide an internal space; a conduit gripping device disposed in said internal space between said first coupling member and said second coupling member such that when the conduit fitting is pulled up on an end portion of a conduit by relative axial translation between said first coupling member and said second coupling member to an initial pulled-up position said conduit gripping device will grip and seal the conduit; a metal deformable structure disposed between an external surface of said first coupling member and an external surface of said second coupling member such that assembly of said first coupling member with said second coupling member to said initial pulled up position causes said metal deformable structure to be compressed between said external surface of said first coupling member and said external surface of said second coupling member to provide an indication of completed pull-up to said initial pulled-up position.