FDC Reverse Acting Rupture Discs

A compression loaded or reverse buckling rupture disc is installed into a system where the normal operating pressure is on the convex side of the formed crown. Reverse buckling discs are available in scored, sheared, or knife types. The dome reverses at the set pressure and then either opens along the scored grooves which part or the dome is cut or sheared in other designs.

It is essential to select the correct reverse buckling disc design for the duty. For example, a cross-scored design would be suitable for gas service and liquids in some cases, while a circular-scored design would be suitable for either gas or liquid or dual-phase service conditions.

• Reverse Dome Shear Type (also known as Reverse Buckling – Compression loaded)
• It is used with installation on FDC standard insert holder or Pre-Troque Type Holder/ Safety Head
• It is integrated with Disc and Knife “similar to Shark teeth”
• Shearing structure ruptured by knife ring attached to disc while dome is inverted
• Can be operated reliably from full vacuum to 90% of its rated burst pressure
• Non Fragmenting Design
• Also available as KSRRKF: Reverse Dome Shear Type for Ferrule (Tri-Clamp Connection) (same as KSRRK but used with installation on Ferrule / TriClamp Connection without holder)
• Standard as ASME Code Sec.VIII or ISO 4126
• Sizes from 1/2″ to 24″
• Set Pressure from 0.35 to 30 kg/cm2
• Temperature from -200 degC to 600 degC
• Process media can be in gas, vapor or liquid
• Max Operation Ratio: 90%

• Reverse Dome Knife Type
• It is used with installation on FDC standard holder
• Reversal structure ruptured by knife blade attached upper holder while dome is inverted
• Highly safe and resistant to corrosion
• Favourable for counterpressure, vacuum and pulsation conditions
• Vacuum Support is needless
• Wide range of workable temperature
• Long life of disc as there is small gap between working pressure and rupture pressure

• The KSRBK model is a Reverse Dome Buckling Knife Type designed for Flange installation without a holder.
• Adheres to standards like ASME Code Sec.VIII, KS B ISO 4126, API RP520, KOSHA Code, and FDC Standard.
• Available in sizes ranging from 1/2″ to 36″, accommodating a variety of system requirements.
• Features a set pressure range from 0.1 to 50kg/㎠, offering flexibility in operational settings.
• Can withstand temperatures up to 593℃, suitable for high-temperature processes.
• Made from materials including C.S, SUS, Duplex, and exotic alloys like Inconel, Monel, and Titanium, ensuring compatibility with diverse process media.
• Designed for processing gas, vapor, and liquid, showcasing its versatility across different industrial applications.
• Operates with a maximum operating ratio of 90%, maintaining performance under stringent conditions without generating sparks.
• Optional enhancements include pressure gauges, burst sensors, and various safety and monitoring features for improved system integrity and reliability.