Pressurized gas vessel port assembly

A pressurized gas vessel port assembly comprising:

• (a) a vessel wall having an inner side and an outer side;
• (b) a port extending through the vessel wall, the port having an inner end and an outer end;
• (c) a first nipple communicating with the port, the first nipple having a hollow bore and an outside diameter, the first nipple extending inwardly from the port;
• (d) a plug moveable between first and second positions within the hollow bore, the plug residing at an inner end of the first nipple upon a movement to the first position, the plug displacing outwardly from the first position upon a movement toward the second position;
• (e) a venturi adapted for inducing an outward flow of the gas within the hollow bore, the venturi comprising first and second aspiration ports opening the hollow bore outwardly from the first position;
• (f) a seat positioned outwardly from the aspiration ports, the seat being fitted for, upon a movement of the plug to the second position, annularly contacting the plug and stanching the outward gas flow;
• and
• (g) a second nipple communicating with and extending outwardly from the port, the second nipple comprising threadedly interconnected concentric segments having inner and outer ends, said segments comprising radially overlying and radially underlying segments, wherein the radially overlying segment has an inside diameter greater than the first nipple's outside diameter, wherein the first nipple's outer end attaches to and aligns with the inner end of the radially underlying segment, wherein the aspiration ports are further positioned inwardly from the inner end of the radially underlying segment;
• and wherein at least one of the aspiration ports is vertically oblongated.