Safety device for pressure vessels

Claim 1

IN A SAFETY DEVICE FOR A PRESSURE VESSEL HAVING A CONCAVE-CONVEX DISC SUPPORTED BY TWO HOLDING MEMBERS WITH THE CONVEX PORTION OF THE DISC SUBJECTED TO THE PRESSURE IN THE VESSEL,THE IMPROVEMENT COMPRISING, SAID DISC HAVING A FLAT ANNULAR FLANGE CONNECTED TO THE CONCAVE-CONVEX PORTION OF THE DISC BY A SMALL RADIUS R CONNECTION, AN INLET CLAMPING RING HAVING AN ANNULAR FLAT RECESS FOR RECEIVING SAID ANNULAR FLANGE FOR CENTERING SAID DISC, AN OUTLET CLAMPING RING HAVING AN ANNULAR FLAT RIDGE COACTING WITH THE ANNULAR RECESS OF THE INLET CLAMPING RING TO GRIP AND HOLD THE ANNULAR FLANGE OF THE DISC, THE INLET CLAMPING RING TERMINATING INWARDLY IN A PLANE WITH THE RECESS WITH A ROUNDED SHOULDER COACTING WITH THE RADIUS R FOR PROVIDING SUPPORT DURING REVERSE PRESSURE, AND THE FLAP PORTION OF THE OUTLET CLAMPING RING TERMINATING INWARDLY IN A PLANE WITH THE RIDGE WITH A ROUNDED SHOULDER HAVING A RADIUS R WHICH IS POSITIONED INWARDLY FURTHER THAN THE ROUNDED SHOULDER ON THE INLET RING BY A DISTANCE AT LEAST AS GREAT AS R THEREBY PROVIDING A BACKUP SHOULDER AGAINST AND SUPPORTING THE TRANSITIONAL CONNECTION.