Reverse Acting Metal Rupture Disc | Striko

STRIKO Reverse Acting Rupture Disks – Metallic Types

STRIKO SU-R / SU-C are reverse acting metallic rupture disks designed for overpressure protection in pressure vessels, reactors, and piping systems. Installation is between flanges using an SHU holder or a pre-torqued SHU Pro holder, allowing controlled torque and disk seating prior to installation.

Operating Principle

During normal operation, the disk dome is loaded in compression. When differential pressure reaches the specified burst pressure, the disk inverts and opens without fragmentation. This geometry reduces fatigue under cyclic pressure and enables use in lines with variable pressure loads.

Technical Data

• Series: SU-R / SU-C
• DN: 25 to 250 mm
• Burst Pressure: 0.3 to 70 bar(g)
• Working Ratio: 90%
• Burst Tolerance: from ±5%
• Operating Temperature: -200°C to +480°C
• Materials: stainless steels, Inconel, nickel, Hastelloy, and special alloys
• Vacuum Support: not required
• Burst Indicator: optional on discharge side

Application Scope

SU-R / SU-C disks are selected for:

• pulsating or alternating operating pressures
• backpressure up to at least 1.4 × nominal burst pressure
• media causing deposits on disk surface
• installation upstream of safety relief valves
• requirement for in-line safety valve testing without removal

Certifications

STRIKO is certified to ISO 9001:2015 for development, production, and sales of rupture disk devices, and complies with Pressure Equipment Directive 2014/68/EU, Module D for metallic and graphite disks.

FAQ

When is reverse acting preferred over forward acting?
When cyclic pressure, backpressure, vacuum, or higher working ratio is required.

Can it be installed upstream of a safety valve?
Yes, provided the relief area, backpressure, and clear flow path are verified.