TWIN FERRULE TUBE FITTINGS

OVERVIEW
Vee-Lok tube fittings are designed to provide a leak-proof connection. The double ferrule design is a mechanism used for sealing and gripping tubing. Through the mechanical advantage and geometry, the tube fitting can overcome the variations in materials, wall thickness and hardness to provide an excellent seal performance.

The tube fitting consists of four parts: body, front ferrule, back ferrule and nut with silver-plated to prevent galling. Vee-Lok double ferrule tube fittings are made of 316 stainless steel and supplied in metric and imperial sizes from 6mm O.D. to 25mm O.D. and 1/8”O.D. to 1”O.D. Straight fittings are machined form bar stock and shaped bodies from forging. A variety of configurations are available for requirement.

FEATURES
When the nut is tightened, the back ferrule is driven against the tapered rear of the front ferrule. The front ferrule is driven by force into the tapered mouth of the fitting body and creates a primary tubing seal. The back ferrule consistently grips the tube to hold the fitting and tubing firmly in place while the front ferrule forms a full –faced seal on the tapered surface of the body. In the twin-ferrule tube fitting design, the back and front ferrules move axially instead of a rotary motion. No Torque is transferred to the tubing during installation.

Figure 1: Internals of tube fitting before make-up

Figure 2: Internals of tube fitting after make-up

1. FRONT FERRULE CREATES A SEAL ON THE TUBING AND FITTING BODY.
2. NUT THREADS ARE SILVER PLATED TO ELIMINATE GALLING.
3. BACK FERRULE RADIALLY PROVIDES A GRIP ON THE TUBING.

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