One-piece fill valve for powered fastener driver

A powered fastener driver comprising:

• a piston cylinder;
• a movable piston positioned within the piston cylinder;
• a drive blade attached to the piston and movable therewith between a top-dead-center position and a bottom-dead-center position;
• a lifter operable to move the driver blade from a driven position corresponding with the bottom-dead-center position toward a ready position;
• a storage chamber cylinder enclosing the piston cylinder and defining therewith a storage chamber in which compressed gas is stored;
• a fill port coupled to the storage chamber cylinder and in communication with the storage chamber;
• a one-piece fill valve having a receptacle, the one-piece fill valve at least partially positioned within the fill port, the fill valve including a slit which, in a closed state, prevents compressed gas in the storage chamber from being discharged to atmosphere through the fill valve and, in an open state, permits the storage chamber to be refilled with compressed gas through the fill valve;
• an adapter coupled to the fill port adjacent the one-piece fill valve, the adapter having a cavity;
• and
• a needle having a tip and a projection, the tip being configured to pass through the cavity and pierce the slit of the fill valve and the projection being configured to contact the receptacle of the fill valve to prevent compressed gas in the storage chamber from being discharged to atmosphere through the fill valve.

A powered fastener driver comprising:

• a piston cylinder;
• a movable piston positioned within the piston cylinder;
• a drive blade attached to the piston and movable therewith between a top-dead-center position and a bottom-dead-center position;
• a lifter operable to move the driver blade from a driven position corresponding with the bottom-dead-center position toward a ready position;
• a storage chamber cylinder enclosing the piston cylinder and defining therewith a storage chamber in which compressed gas is stored;
• a fill port coupled to the storage chamber cylinder and in communication with the storage chamber, the fill port including a stepped inner surface;
• a one-piece fill valve having a head, a body, and a receptacle, the one-piece fill valve at least partially positioned within the fill port, the fill valve including a slit which, in a closed state, prevents compressed gas in the storage chamber from being discharged to atmosphere through the fill valve and, in an open state, permits the storage chamber to be refilled with compressed gas through the fill valve;
• and
• an intermediate block configured to be pressed into the fill port adjacent the one-piece valve, the intermediate block having a cylindrical body and an axial stop projecting radially inwardly from the cylindrical body, the axial stop of the intermediate block being configured to inhibit removal of the fill valve from the fill port.