Overpressure indicating reverse buckling disk apparatus

An overpressure indicating disk apparatus for indicating an over pressure condition in a pressurized system, comprising:

• a) a body having first and second end portions and a bore, the first end portion configured for attachment to the pressurized system and in pressure communication therewith;
• b) a rupture disk having an annular peripheral portion and a central portion, said annular peripheral portion surrounding said central portion, the disk annular peripheral portion mounted to the body and closing the bore at said first end portion;
• c) an indicating member affixed to a combination of body and disk, the indicating member including a hinge and a movable tab portion that is movable upon the hinge between first and second positions;
• d) wherein when the pressure in the bore exceeds a preselected maximum pressure value, the disk displaces the movable tab to move from the first and second position thereby indicating an overpressure condition within the bore.

An overpressure indicating disk apparatus for indicating an over pressure condition in a pressurized system, comprising:

• a) a body having first and second portions and a bore, the first portion configured for attachment to the pressurized system and in pressure communication therewith;
• b) a domed disk having an annular peripheral portion and a concave convex dome portion, said annular peripheral portion surrounding said dome portion, the disk annular peripheral portion mounted to the body and the domed disk closing the bore at said first portion so that the body and bore holds pressure of the pressurized system;
• c) an indicating component affixed to a combination of body and domed disk, the indicating component having an annular peripheral portion that aligns generally with the annular peripheral portion of the disk;
• d) the indicating component including a movable tab portion that extends inside the annular peripheral portion;
• e) a hinge that connects the tab portion to the indicating ring;
• and
• f) wherein a concave side of the disk faces the tab portion and a convex side of the disk faces a pressure side of the bore so that when the pressure in the bore exceeds a preselected maximum pressure value, the disk dome moves to engage and displace the tab portion thereby indicating an overpressure condition within the bore.