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9~25 PSI Burst Discs

Vacuum Burst Disc

Vacuum systems are engineered to operate under external (atmospheric) pressure loads, and were never intended for internal pressurization. Accu-Glass burst discs are important and preventative safety devices designed to protect vacuum systems against accidental over-pressurization. Failure of internal gas or cryogenic fluid supply lines can lead to rapid pressurization inside a vacuum vessel — well above its internal load limits. Besides protecting delicate system instruments and equipment — such as vacuum viewports — burst discs (burst disk) minimize the risks of injury to system operators and personnel.

Vacuum Burst Disc

Vacuum systems are engineered to operate under external (atmospheric) pressure loads, and were never intended for internal pressurization. Accu-Glass burst discs are important and preventative safety devices designed to protect vacuum systems against accidental over-pressurization. Failure of internal gas or cryogenic fluid supply lines can lead to rapid pressurization inside a vacuum vessel — well above its internal load limits. Besides protecting delicate system instruments and equipment — such as vacuum viewports — burst discs (burst disk) minimize the risks of injury to system operators and personnel.

How do Vacuum Burst Discs Work?

Simple — pressure buildup inside a vacuum vessel deforms a concave thin metal-foil diaphragm, pushing it against radial spikes built into a burst disc's housing. The diaphragm ultimately ruptures providing an instant pressure relief path for a vessel's internal volume. In the case of our low-pressure devices, a unique stress-pattern is scored right onto the metal diaphragm, effectively pre-stressing it for precise pressure and rupture control. Accu-Glass burst discs are available and certified for two pressure ranges. Low-pressure units (scored diaphragm) have a large 1.93 square-inch deflection area and rupture between 9 and 11.5 psi. High-pressure units (puncture type) rupture between 15 and 25 psi and have a smaller 1.2 square-inch deflection area. Note that a ruptured burst disc cannot be repaired! Once a unit fails, it must be replaced in order to make a vacuum system operational again.

Caution! Note that AG burst-disc ratings are @22.2°C (72°F), so operating these devices at higher temperatures will reduce their burst pressure rating.

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