| 摘要 |
A pressure regulating air valve assembly ( 100 ) for a pneumatic tool ( 90 ) is disclosed that is movable between an open position and a closed position such that the maximum pressure in the tool is limited to a predetermined value. The valve assembly include a fitting ( 110 ) with a central aperture ( 112 ) and an upper portion ( 114 ). A valve plate ( 130 ) is disposed in the fitting, and a collar ( 140 ) having an aperture ( 146 ) is retained in the fitting. A proximal end of a tubular piston ( 120 ) extends through the aperture, and a spring ( 118 ) biases the piston toward an open position. When the pressure in the hand tool exceeds a predetermined value, the pneumatic force on a distal annular head ( 126 ) of the piston urges the piston toward the valve plate ( 130 ), closing the valve. The valve plate may include a centering portion ( 134 ) and an elastomeric panel ( 136 ).
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