High pressure safety valve, system and method

A method for substantially reducing gas flow from an over-pressurized tank filled with pressurized content, the method comprising the steps of:

• introducing a high pressure safety valve apparatus, the apparatus being threadably insertable into a valve which is threadably insertable into the tank, the apparatus comprising a housing base having a first bore, a rupture disc assembly comprising a second bore, at least one rupture disk and a piston having a disc seating surface and at least a third bore, a spring, and an outer housing cylinder having a forth bore, an upper ceiling within the forth bore, and female threads formed on a lower portion of the outer housing cylinder, the first bore, the second bore and the third bore all being in gas flow communication with the compressed content and the gas flow outlet line;
• mechanically engaging the rupture disc assembly to allow normal gas flow between the bores and the outlet line during a non-over pressurization event;
• and
• allowing the rupture disc assembly to substantially restrict gas flow between the bores and the outlet line during an over pressurization event.

A system for allowing content flow from a pressurized tank filled with content which substantially reduces gas flow when the tank is over pressurized, the system comprising a housing base having a first bore, a rupture disc assembly comprising a second bore, at least one rupture disk and a piston having a disc seating surface and at least a third bore, a spring, and an outer housing cylinder having a forth bore, an upper ceiling within the forth bore, and female threads formed on a lower portion of the outer housing cylinder, the first bore, the second bore and the third bore all being in gas flow communication with the compressed content and the gas flow outlet line, the piston further comprising an integrally formed lower body portion, a middle body portion and an upper body portion having a seat surface, the inner bore being of sufficient width to receive the rupture disc seating assembly through a predetermined length of the piston, the inner bore being of sufficient width to prevent the receipt of the rupture disc assembly through the remaining overall length of the piston, the upper body portion further comprising a beveled surface thereon, and wherein the spring has a first radial arm and a second radial arm, the spring being adapted to wrap around the piston's middle body portion, the first radial arm being adapted to sit upon the piston's upper body portion seat surface, and the second radial arm being adapted to mechanically engage the outer housing cylinder's upper ceiling, the spring further being adapted to maintain a constant compression upon piston disc seat surface during a non-over pressurization event, and in a substantially compressed fashion during an over pressurization event to thereby allow the piston beveled surface to mechanically engage the outer housing cylinder's upper ceiling.