ADJUSTABLE SPRING LOADED VALVE FOR A CORE BARREL HEAD ASSEMBLY

摘要

An adjustable spring loaded plunger valve for a core barrel head assembly for a drill string. The core barrel head assembly includes a latching mechanism. A valve rod is operatively connected to the latch mechanism and extends toward a bit end of the drill string. An inward fluid flow port is arranged between the latching mechanism and the valve. An outward fluid flow port is arranged toward the bit end of the drill string. The valve includes a non-resilient valve ring and a resilient valve ball. The valve ball passes through the valve ring to open and close the valve. A diameter of the resilient ball valve is configured to be variable to vary a pressure required to move the ball valve through the valve ring.