Composite Type C – Bi-directional Bursting Disc

The Composite Type C – Bi-directional bursting disc provides dual-direction protection, making it an optimal solution for systems exposed to both overpressure and vacuum conditions. Built using precision laser-cut predetermined breaking points in stainless steel, nickel, Inconel, Hastelloy* or tantalum foils, this rupture disc delivers exact burst values—even at extremely low pressures starting from 20 mbar at 20 °C.

Whether the pressure rises above or drops below the permissible limits, the foil opens in a controlled, hinge-like, fragment-free pattern, ensuring safe discharge while protecting downstream equipment. A PTFE or PFA diaphragm is integrated between the slotted metal foils, providing a reliable seal and chemical resistance for operating temperatures up to 200 °C.

Technical Capabilities

• Provides protection against both overpressure and vacuum
• Precision burst pressures from 20 mbar
• Operating temperatures up to 200 °C
• Supplied in nominal diameters from DN15 to DN900
• Materials include stainless steel, nickel, Inconel, Hastelloy*, and tantalum
• Fragment-free, hinge-type opening for maximum process safety

Mounting Options & Compatibility

Bi-directional discs can be mounted:

• Directly between EN 1092 standard flanges
• Directly between ASME B16.5 flanges
• In rupture disc holders
• In clamp coupling units

Burst Detection Solutions

• Membrane signal transmitters for direct flange mounting
• Inductive proximity switch transmitters for holder or clamp-mounted discs

Key Benefits

• Fully custom-specified burst pressure, material and dimensions
• Capable of very low burst pressures across large diameters
• Fragment-free operation ensures downstream equipment protection
• Available with integrated burst detection for system monitoring
• Support-free mounting possible depending on duty conditions

The Composite Type C – Bi-directional bursting disc offers full-spectrum pressure relief, combining precision engineering with robust materials and flexible installation options—making it the ideal safeguard for dynamic process environments facing both vacuum and overpressure scenarios.

Technical Specifications: