| 摘要 |
A valve assembly for a pneumatic fastener includes a firing valve piston, an O-ring coupled with the firing valve piston, and a guide ring coupled with the firing valve piston. The firing valve piston has a groove disposed within its outer surface. The guide ring is coupled with the firing valve piston via the groove of the firing valve piston such that the guide ring protrudes from the groove of the firing valve piston. The guide ring is constructed to permit pressure equalization from about the valve assembly between the O-ring and the guide ring.
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