The dual activated circulation valve offers the burst disc and ball activated circulation valve to return circulation operation. The burst disc circulation sub is incorporated into the coiled tubing tools. When circulation lost, a predetermined pressure applied to the coil will burst the disc in the sub and reestablish circulation. The burst disc circulation sub are supplied with a blanking plug for the burst disc.

The ball active circulation valve is activated by using a drop ball, and can be

adjusted on the surface to shear out by varying the number and type of shear pins.