a pneumatic nail gun, comprising: an operational piston, which is connected to a driving piston, to drive a fastener and to which compressed air is applied, when a driving process is triggered, a trigger and a contact sensor, whose Joint actuation can supply air or outlet to the main control line, said main control line, thus being able to trigger a triggering process, a control valve assembly, which has a trigger valve associated with the trigger and has a contact sensor valve associated with the contact sensor, and a safety valve assembly, which can be moved between a blocking position and an open position by controlling the pressure in a first control chamber and the pressure in a second chamber control, where the main control line is connected to the control valve assembly in the open position and is not connected to the control valve assembly in the blocking position, the pr The first control chamber is connected to the trigger valve in such a way that an actuation of the trigger valve attempts to place the safety valve assembly in the blocking position, and in the open position, the second control chamber is connected to the valve. contact sensor in such a way that an actuation of the contact sensor valve attempts to place the safety valve assembly in the open position at least when the trigger valve is actuated.
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