Abstract: A nut running pneumatically powered tool, such as an impact wrench, having in a handle portion a group of valves including a throttle valve for admitting air to the tool, a manually adjustable directional valve for selectively directing the air to either a forward or reverse side of an air motor, and a regulating unit located between the directional valve and the throttle valve manually adjustable independently of the directional valve for regulating the volume air flow from the throttle valve to the directional valve.

Abstract: A nut running air tool improved with a back and forth manually slidable control valve located between a throttle valve and an air motor, the control valve having a forward position allowing full volume air flow to the motor and maximum forward torque output, a reverse position allowing full volume air flow to the motor and maximum reverse torque output, and the control valve having integral manipulative means for adjusting its effective length so as to permit it to be moved to a third position allowing a restricted volume air flow to the motor and restricted forward torque output.