Fluid couplings, systems, and methods

A fluid coupling, comprising:

• a first member configured for connection with a first fluid conduit, the first member including a shoulder;
• a second member configured for connection with a second fluid conduit;
• a nut;
• and
• a sleeve engaged with the nut to restrict axial movement of the sleeve relative to the nut and enable rotational movement of the sleeve with respect to the nut, and configured to cover the shoulder upon a complete connection of the first member with the second member;
• wherein the nut includes a circumferential groove and the sleeve includes a radially-extending circumferential flange that, when engaged with one another, the radially-extending circumferential flange is rotatable within the groove to enable the rotational movement of the sleeve with respect to the nut, while the circumferential groove restricts axial movement of the radially-extending circumferential flange to restrict the axial movement of the sleeve relative to the nut;
• wherein the sleeve includes an internal spline profile disposed at an axial end of the circumferential groove facing the second member, and configured to engage an external spline profile of the nut disposed at an axial end of the radially-extending circumferential flange facing the second member.

A fluid coupling, comprising:

• a first member configured for connection with a first fluid conduit, the first member including a shoulder;
• a second member configured for connection with a second fluid conduit;
• a nut;
• and
• a sleeve engaged with the nut to restrict axial movement of the sleeve relative to the nut and enable rotational movement of the sleeve with respect to the nut, and configured to cover the shoulder upon a complete connection of the first member with the second member;
• wherein the nut includes a circumferential groove and the sleeve includes a radially-extending circumferential flange that, when engaged with one another, the radially-extending circumferential flange is rotatable within the groove to enable the rotational movement of the sleeve with respect to the nut, while the circumferential groove restricts axial movement of the radially-extending circumferential flange to restrict the axial movement of the sleeve relative to the nut;
• wherein the sleeve includes an internal spline profile disposed at an axial end of the circumferential groove facing the second member, and configured to engage an external spline profile of the nut disposed at an axial end of the radially-extending circumferential flange facing the second member;
• and wherein the circumferential groove includes a stepped portion and the radially-extending circumferential flange includes a shoulder portion that corresponds to the stepped portion when the circumferential groove and the radially-extending groove are engaged with one another.