Gaugeable Tube Fittings and Adapter Fittings
Features ■ Live-loaded, two-ferrule design. ■ Easy to install. ■ No torque is transmitted to tubing during installation. ■ Swagelok® gap inspection gauge ensures sufficient pull-up upon initial installation.
2
Back ferrule Hinge point
Tubing
Nut Front ferrule
Fitting body
During assembly of the advanced-geometry design (above), the front ferrule is driven into the fitting body and the tubing to create primary seals, while the back ferrule hinges inward to create a strong grip on the tubing. The back ferrule geometry allows for an improved engineering hinging-colleting action that translates axial motion into radial swaging action on the tube, yet operates with a low assembly torque requirement.
Two-Ferrule, Mechanical Grip Design
The two ferrules separate sealing and tube gripping functions; each ferrule is optimized for its function. The front ferrule creates a seal: ■ against the fitting body ■ on the tubing outside diameter. As the nut is turned, the back ferrule: ■ axially advances the front ferrule ■ radially applies an effective tube grip.
Advanced-Geometry, Hinging- Colleting Back Ferrule Design
This design is standard on all 1/4 to 1/2 in. and 6 to 12 mm Swagelok stainless steel tube fittings to help installers make more consistent, leak-tight tube connections.
In these sizes, a patented case hardening process and patented recessed and contoured geometry provide unique engineering to the Swagelok back ferrule. The hinging-colleting back ferrule design expands on the already robust performance of the traditional ferrule design and provides:
■ excellent gas-tight sealing and tube-gripping action ■ easily achieved proper installation ■ consistent remakes
■ excellent vibration fatigue resistance and tube support
■ full compatibility with original Swagelok stainless steel tube fittings of identical sizes.
For additional information, see the 316 Stainless Steel Swagelok Tube Fittings with Advanced Geometry Back Ferrules technical report, MS-06-16.
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