Valve assembly for a pre-charged pneumatic airgun

A valve assembly suitable for, although not limited to, use in a Pre-Charged Pneumatic (PCP) airgun which includes a barrel, a plenum, and a trigger mechanism, the valve assembly comprising—

• a valve including a valve body terminating at one end in a valve face and at an opposite end in a valve base;
• an end cap located at one end of the valve such that the valve is slidingly displaceable relative to the end cap;
• a pressure chamber defined between the valve base and the end cap;
• an air flow channel extending between the plenum and the pressure chamber for guiding pressurized air from the plenum to the valve base;
• and
• a velocity-adjustment screw located in the air flow channel for adjusting air flow from the plenum to the pressure chamber;
• the assembly being such that valve lift is fixed through displacement of the valve body, while valve dwell time is controlled by choking airflow into the pressure chamber through adjustment of the velocity-adjustment screw.