| 摘要 |
A pneumatic tool ( 20 ) for impacting a workpiece ( 22 ) is provided. The tool ( 20 ) comprises a casing ( 42 ) defining a chamber ( 48 ). A piston ( 54 ) is slidable within the chamber ( 48 ) along an operational axis (A). An exhaust valve ( 100 ) controlled by a pilot valve ( 200 ) slides the piston ( 54 ) by selectively introducing and releasing pressurized fluid into and out from the chamber ( 48 ). The pilot valve ( 200 ) includes a valve housing ( 202 ) defining a pilot chamber ( 204 ) with a plunger ( 206 ) slidable in the pilot chamber ( 204 ). The pilot valve ( 200 ) actuates the tool ( 20 ) by quickly releasing pressurized fluid from the exhaust valve ( 100 ) to atmosphere. The pilot valve ( 200 ) includes a spring-biased annular seal ( 214 ) that is releasable from a poppet seat ( 222 ) to perform this function.
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