RA SeriesReverse Acting Disks

• RAH Series offers one unique holder design that fits with multiple types of ZOOK Reverse-Acting metal rupture disks (RA4, RA6, RA8, RAX)
• Pre-Torque Design allows for:
• Pre-assembly of a rupture disk into a holder prior to field installation
• Removal of the assembly from the piping system for inspection without disturbing the seal integrity of the rupture disk
• Pre-torque bolts properly seat the disk by engaging the holder bite
• Disk Dome is contained within holder’s inlet, which prevents damaging the disk during installation into mating flanges
• Locating Pin allows only reverse-acting type disks to be mounted into holder
• Fluoropolymer coated socket head cap screws resists corroding to holder assembly and provides easy removal without special sockets
• Polyethylene cap screw covers prevents debris from building up in cap screw head
• Sizes 1” thru 12”
• Standard holder materials: Carbon Steel (WCB), Stainless Steel (CF3M), Hastelloy (CW12MW)
• Holder information is permanently affixed to the O.D. of holder
• Bubble tight metal-to-metal bite and disk seal
• Flow direction arrows on disk tag and holder provides permanent visual verification that holder assembly is properly oriented in the piping system
• ANSI, DIN, and JIS Flange class and type specific, guards against installing an assembly into mating flanges with a different pressure rating than the rupture disk holder
• Positioning hole in mounting lug is located in the exact position as the mating flange and allows for proper alignment. It can also be used as an extra “hand” when installing into horizontal piping
• For custom materials and alternative flanges (types/ratings) ZOOK offers custom inserts (RAHI) or full flanges (RAH7) and custom overall heights

Rupture Disk Features

• Operating ratios up to 95% of the low end of burst tolerance
• Disk design offers high cycle life
• Suitable for liquid, gas, or two-phase applications (RAX available for gas service only)
• Standard manufacturing design range and total tolerance ensures marked rating on disk tag does not exceed the MAWP of equipment
• Withstands full vacuum without vacuum support
• Wide range of standard and exotic materials available
• Sizes from 1” (25mm) through 12” (300mm)
• Unique alignment pin design ensures proper disk orientation into RAH Series disk holder
• 3-dimensional stainless steel tag permanently attached and engraved with complete disk specifications