The Hydro-Trip Sub is used to hydraulically set tools, such as hydraulic packers with the application of tubing pressure. Setting is achieved by circulating a ball to a seat in the sub, and applying sufficient pressure to activate the setting mechanism in the tool below.
When further pressure is applied to the ball, the mechanism shears, allowing the ball to pass down the tubing string.
After the Hydro-Trip Sub has been set, the tool provides an open bore for passage of drop balls or wireline equipment.