Instrument Fittings

Instrument Fittings

• The basic Double Ferrule Tube Fitting is a four piece Fitting consisting of the Nut, the Back Ferrule, the Front Ferrule and the Body. When installed, it becomes a five piece connection with the addition of the tubing and provides a solid leak-free joint.
• The two ferrules grasp tightly around the tube with no damage to the tube wall. Exhaustive tests have proven that the tubing will yield before a Fluid Control Double Ferrule joint starts leaking.
• The secret behind the success of the Double Ferrule Fitting lies in the two ferrule design which is a combination of geometry and metallurgy. All the action in the fitting is by an axial movement along the tube (instead of a rotary motion) to create the joint. This axial movement prevents any torque transmittal from the fitting to the tubing. Since there is no initial strain on the tubing, the making of the joint does not weaken the tubing.
• Another advantage of the Double Ferrule Fitting is that the sequential action of the twin ferrules overcomes variations in the wall thickness, hardness and dimensional tolerance of the tubes. In this way, proper ferrule interaction compensates for most of the variables which lead to failure in other fittings.
• Double Ferrule Fittings are easy to install and require no special tools in the process. They are reusable several times and can withstand heavy impulse and vibration both in vacuum and pressure systems. Absence of damage to the tube surface prevents fatigue failure.