Safety valve arrangement for pressurized containers

Claim 1

IN AN ALUMINUM CYLINDER OF THE PORTABLE THROW-AWAY TYPE FOR FUEL GAS HAVING A CLOSURE CAP WITH A CENTRALLY POSITIONED DISPENSING VALVE, THE IMPROVEMENT WHICH COMPRISES THE CLOSURE CAP ADDITIONALLY CONTAINING A SPRINGLOADED EXCESS PRESSURE RELIEF VALVE, EXTENDING THROUGH THE BOTTOM OF SAID CLOSURE CAP, ALONGSIDE THE DISPENSING VALVE, AND AN EXCESS PRESSURE BLOW-OUT CLOSURE, SAID SPRING-LOADED EXCESS PRESSURE RELIEF VALVE BEING SET TO BLEED AT A PRESSURE OF 300-350 POUNDS PER SQUARE INCH GAUGE, AND SAID BLOW-OUT CLOSURE BEING SET TO BLOW AT A PRESSURE OF ABOUT 400-450 POUNDS PER SQUARE INCH GAUGE, WITH SAID SPRING-LOADED EXCESS PRESSURE RELIEF VALVE BEING DIMENSIONED SO AS TO HAVE A SLOW RATE OF GAS DISCHARGE, WHEREBY WHEN SAID CYLINDER IS SUBJECTED TO EXCESSIVE HEAT IN THE ABSENCE OF FIRE CONDITIONS, THE SPRING-LOADED EXCESS PRESSURE RELIEF VALVE CAN OPERATE TO LOWER THE INTERNAL PRESSURE OF THE CONTAINER TO THE EXTENT REQUIRED TO PREVENT THE BURSTING OF SAID CONTAINER AND ALSO LIMIT THE QUANTITY OF GAS RELEASED UNDER SUCH CONDITIONS TO THAT WHICH IS REQUIRED TO PREVENT BURSTING OF THE CONTAINER, SAID EXCESS PRESSURE BLOW-OUT CLOSURE BEING IN FREE FLOW COMMUNICATION WITH THE AMBIENT ATMOSPHERE AND DIMENSIONED TO EMPTY THE CYLINDER UPON BLOWING WITHIN 5-10 SECONDS, WHEREBY WHEN SAID CYLINDER IS SUBJECTED TO EXCESSIVE HEAT IN THE PRESENCE OF FIRE CONDITIONS, THE BLOWOUT CLOSURE CAN OPERATE TO EMPTY THE CONTAINER SUFFICIENTLY RAPIDLY TO PREVENT EXPLOSION.