Learn how our patented back ferrule geometry and patented SAT 12 case hardening process provides an advantage in several different industries at http://northerncal.swagelok.com/swagelok-tube-fitting-advantage
When evaluating tube-fitting performance, look for these Big Three factors: tube grip, gas seal, and vibration protection. You should expect a tube fitting to deliver outstanding performance in all three areas, and Swagelok patented two-ferrule fitting design gives you what you are looking for.
Swagelok's hinging collecting action puts more of the back ferrule's surface in contact with the tubing. This provides more material for direct axial support and colleting squeeze. You won't get that with a bowing ferrule or from the bite type. With Swagelok, you get a stronger seal under maximum working pressure.
A Swagelok tube fitting forms a gas seal by means of the burnishing that occurs in two places: between the front ferrule and the tube fitting body, and between the front ferrule and the tubing.
Bending, deflection and vibration puts stress on tubing. With a bite type of fitting, all three stress factors can become amplified at the stress riser, where the ferrule bites into the tubing. That can lead to tube fractures. Any extra vibration, pulsation, thermal shock or side load exerted on the fitting, the minimal contact of a bite type fitting offers minimal support behind the bite. That raises the risk of pull-out or damage to the tube.
Any place where the fitting comes into contact with the tubing can become a point of concentrated stress. Swagelok's patented colleting action puts more of the back ferrule in contact with the tubing. The protected stress riser reduces the damaging effect of system vibration.
When evaluating tube-fitting performance, look for these Big Three factors: tube grip, gas seal, and vibration protection. You should expect a tube fitting to deliver outstanding performance in all three areas, and Swagelok patented two-ferrule fitting design gives you what you are looking for.
We have three ways for you to learn more about the advantages of Swagelok's patented fitting design. First, we have a video (below) that goes over the information in this post, but in more detail and with animated illustrations. For an even deeper look, we have PDFs that illustrate the Swagelok Tube Fitting Advantage in specific industries plus Product Test Reports that show these advantages in action.
For real hands-on instruction about the proper installation of Swagelok tube fittings, sign up for our Swagelok Tube Fitting Safety Seminar.