Air canister for air gun

An air canister for an air cylinder including a valve seat, a valve formed in the valve seat, a channel formed within the valve, a plurality of port members each having an end communicating with the channel, an annular groove formed on an inner end of the valve seat, and a sealing ring put on the annular groove to block the port members, comprising, in combination:

• an externally threaded head including an axial chamber, an annular first groove, and a first sealing ring put on the first groove;
• an internally threaded cap secured to the externally threaded head;
• a spring biased sliding rod including an internal first passage, an internal second passage blocked from the first passage and extending out of both the externally threaded head and the internally threaded cap, a first port having a first end communicating with the first passage and a second end terminating at an outer surface of the spring biased sliding rod, and a second port having a first end communicating with the second passage and a second end terminating at the outer surface of the spring biased sliding rod;
• an externally threaded sleeve secured to both the externally threaded head and the internally threaded cap and including an annular second groove formed on an inner surface, a second sealing ring put on the second groove, an annular third groove formed on the inner surface of the externally threaded sleeve, a third sealing ring put on the third groove, an annular fourth groove formed on the inner surface of the externally threaded sleeve, and a fourth sealing ring put on the fourth groove;
• and
• a C-ring clamped onto the spring biased sliding rod to be spaced from the internally threaded cap;
• wherein in response to partially inserting the spring biased sliding rod into the valve to align the second passage with the channel and pushing the air canister toward the air cylinder until being stopped by the C-ring, the fourth sealing ring passes the second port so that compressed air flows to the port members via the first passage, the second passage, and the channel, and the compressed air enters the air cylinder by disengaging the sealing ring from the port members.