Adjustable anti-siphon pin valve for paintball gun

A valve assembly coupleable between a tank for holding a gas propellant and a paintball marker, the valve assembly comprising:

• an outer valve assembly having a first threaded end for threadedly engaging the tank, a second threaded end for threadedly engaging a gas input port of the paintball marker, and a first fluid passageway disposed through the first and second threaded ends;
• an inner valve assembly having a proximal end, a distal end, and a second fluid passageway disposed through the proximal and distal ends, the inner valve assembly disposed in the first fluid passageway so as to be axially restrained but rotatable relative to the outer valve assembly;
• and
• a siphon tube coupled with and extending from the inner valve assembly, the siphon tube in fluid communication with the second passageway and having an inlet rotatable with the inner valve assembly.

A method for extracting gaseous carbon dioxide from a tank of gaseous and liquid carbon dioxide, the method comprising:

• a. coupling a valve assembly to a carbon dioxide tank, the valve assembly having a siphon tube that is rotatably positionable relative to the carbon dioxide tank;
• b. placing a mark on an exterior of the tank, the mark corresponding to a top dead center position of the tank relative to a gun;
• c. removing the tank from the gun;
• d. engaging a portion of the valve assembly associated with the rotatable siphon tube with an adjustment tool, the adjustment tool having an alignment mark which corresponds to a top dead center position of the siphon tube inlet relative to the tank when the alignment mark is coaxial with the exterior tank mark;
• e. rotating the adjustment tool until the tool alignment mark coaxially aligns with the exterior tank mark;
• and
• f. re-coupling the tank to the carbon dioxide tank.

The method of claim 20, wherein the valve assembly comprises:

• an outer valve assembly having a first threaded end for threadedly engaging the tank, a second threaded end for threadedly engaging a gas input port of the gun, and a first fluid passageway disposed through the first and second threaded ends;
• an inner valve assembly having a proximal end, a distal end, and a second fluid passageway disposed through the proximal and distal ends, the inner valve assembly disposed in the first fluid passageway so as to be axially restrained but rotatable relative to the outer valve assembly;
• and
• a siphon tube coupled with and extending from the inner valve assembly, the siphon tube in fluid communication with the second passageway and having an inlet rotatable with the inner valve assembly.