| 摘要 |
<p>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. 1.</p> |
