Full Flow Flapper Type
 
The Model G is a flapper type float valve that offers unobstructed flow through the float valve. It’s designed for abrasive drilling fluids. The flapper closes to prevent cuttings from entering the drill string when flow stops and acts to assist BOP equipment in maintaining control over pressure in the drill string. The Model G features an investment cast flapper that is quick opening, allowing full flow through the valve. It fully opens when joints are raised from the hole, preventing drilling mud from being released onto the rig floor.