Rupture disk is a non-mechanical overpressure relief device that ruptures when its rating is attained. The disk consists of a ring covered with a membrane of predetermined thickness, designed to withstand a maximum pressure. They are generally used as a back-up device when the spring loaded safety valve fails. Disks perform as a designed weak spot in a pressure system. When pressure exceeds established safe operating limits, the system manages the over-pressure. One rupture disk application simulates exposure conditions (friction) on space vehicles re-entering the atmosphere. Three basic arrangements of rupture disks in a pressure relief system include in-series valve and disk combination, rupture disk as sole relief device as well as rupture disk & relief valve installed separately. They also serve as a barrier to prevent leakage.
Rupture Disk consists of a thin metal diaphragm held between flanges. The disk is designed to rupture and relieve pressure within tolerances established by ASME code. It is a non reclosing pressure operated device. Rupture Disk provides an improved scoring configuration that allows low pressure burst disks of very small diameter such as 0.25 inches in diameter.
A rupture pin safety relief valve is a device in which a piston and a plate is subjected to the system pressure, which is held in place by a pin. When the axial force on the plate reaches a critical value, the pin buckles, the piston and the plate instantly move to a full-open position. Also, it is a non-reclosing differential pressure relief device actuated by inlet static pressure, which is designed to function by bursting the pressure containing rupture disk.