A valve assembly includes a valve body, a valve bonnet, coupled to the valve body, an opening extending through the valve body and the valve bonnet, along a longitudinal axis, and a valve stem. The valve assembly also includes a valve member positioned at an end of the valve stem and arranged within the opening, the valve member being movable, along the longitudinal axis, between an open position and a closed position, an actuator housing coupled to the bonnet, and an adapter assembly coupled to the actuator housing. The adapter assembly includes an adapter element, the adapter element coupled to the valve stem and a force converter coupled to the adapter element, the force converter translating an external rotating force into an axial force.