GRAPHITE RUPTURE DISKS

ZOOK Graphite Rupture disks are made from a single piece of graphite, a high-purity form of carbon,
which is impregnated with phenolic resin. The resulting material, called impervious graphite, is
impermeable and is resistant to most corrosives.

MONO TYPE DISKS

Best choice for low and intermediate burst ratings
Mounts directly between standard ASME B16.5 flanges
Process pressure is applied to the counterbore
side of the rupture disk
Operate up to 90% of marked burst pressure
Vacuum supports are available for ratings below
25 psig
Stocked ratings are available for immediate shipment
ASME UD marking available

INVERTED TYPE DISKS

Best choice for higher burst rating
Mounts directly between standard
ASME B16.5 flanges
Process pressure is applied to
the flat side of the rupture disk
Operate up to 90% of marked burst
pressure
Stocked ratings are available for
immediate shipment
ASME UD marking available

DUPLEX TYPE DISKS

Best choice for applications involving
highly oxidizing agents and halogens
Mounts directly between standard
ASME B16.5 flanges
Disks extend corrosion resistance
by utilizing a liner on the flat surface of the
disk that contacts the process media
Operate up to 90% of marked burst
pressure
External type vacuum supports are
available for vacuum service
ASME UD marking available

TWO-WAY TYPE DISKS

Dual rated to protect against two different pressures
in opposite directions
Mounts directly between standard ASME B16.5 flanges
Applications include protection of storage tanks
against both excess vacuum and overpressure when single
vessel entry is required
Operate up to 90% of marked burst pressure
Furnished standard with Carbon steel armor and
TFE gaskets

INSULATED UNIT

For temperatures exceeding 430°F (221°C)
to 700°F (371°C)
Furnished as an attached unit. Disk’s nameplate
rating must be established at the cold face temperature
of the insulation
NOT available for TWO-WAY Disks or disks with ring
or plate vacuum supports
Insulated Units are supplied armored with -required
insulation and gaskets for service above 430°F
(221°C) to 700°F (371°C). Standard armor
is carbon steel, gaskets are non-asbestos, and insulation
is spun alumina/silica. This insulation prohibits
use with liquids and some corrosives.
Other materials are available upon request

RA SERIES REVERSE-ACTING RUPTURE DISK SYSTEM

The RA Series offers a single unique pre-torque holder design for use with multiple types of ZOOK Reverse-Acting metal rupture disks.

RAH PRE-TORQUE RUPTURE DISK HOLDER

Pre-Torque Design allows
…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
…mounting between soft or fragile material
flanges (PVC, Glass, etc.) and sealed by using a
soft gasket material with low torque on the
companion flange boltingBest choice for low and
intermediate burst ratings
Mounts directly between standard ASME B16.5,
PN, or JIS flanges
Sizes 1” thru 12”
Standard Holder Materials: Carbon Steel, 316SS,
Hastelloy

RA4 SERIES RUPTURE DISK

Solid metal Scoreless disk designed for Non-
Fragmentation
Best choice for Low range of burst ratings (3psi to
40 psi)
Operating ratios up to 90% of the low end of burst
tolerance
ASME UD, CE, and TUV compliance available
(Liquid and Gas Service)

RA6 SERIES RUPTURE DISK

Solid metal Scoreless disk designed for Non-
Fragmentation
Best choice for Intermediate range of burst
ratings (12psi to 200 psi)
Standard operating ratio of 90% of the marked
rating on disk tag. (Higher operating ratio
available upon request)
ASME UD, CE, and TUV compliance available
(Liquid and Gas Service)

RA8 SERIES RUPTURE DISK

Solid metal Scoreless disk designed for Non-
Fragmentation
Best choice for Upper range of burst ratings (26psi
to 1000 psi)
Standard operating ratio of 90% of the marked
rating on disk tag. (Higher operating ratio
available upon request)
ASME UD, CE, and TUV compliance available
(Liquid and Gas Service)

RAX SERIES RUPTURE DISK

Solid metal Cross-Scored disk designed for Non-
Fragmentation
Best choice for Upper range of burst ratings (27psi
to 1000 psi)
Standard operating ratio of 90% of the marked
rating on disk tag. (Higher operating ratio
available upon request)
ASME UD, CE, and TUV compliance available (GAS
SERVICE ONLY)

REVERSE ACTING RUPTURE DISKS

ZOOK Reverse Acting rupture disks offer revolutionary new scoreless and scored nonfragmenting
designs for universal use – new ultra low ratings – 90% operating ratios.

URA SERIES

Scoreless
design offers higher cycle life when compared to
scored reverse acting disks
Single disk design covers 95% of plant requirements
Excels in liquid, gas, or two-phase applications
ASME
UD marking available

RLP SERIES

Unique
scoreless dual domed design offers ultra low burst
ratings
Excels
in liquid, gas, or two-phase applications
ASME
UD marking available

SRA SERIES

Disk
is cross scored on the vent side to minimize the
effect of product build-up on the process side
Suitable
for gas service only
ASME
UD marking available

SB SERIES

Solid
non-scored disk reverses into
knife blades mounted into outlet holder
Superior
fatigue and cycle life when compared to scored reverse
acting disks

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DISK/HOLDER ACCESSORIES

Optional items that can be ordered to enhance a rupture disk installation.

GASKETS

Supplied cut to the proper dimensions recommended
for disk size and/or holder provided.

Stocked in the following materials: Neoprene, Garlock
3000, PTFE, and PTFE Envelope. Other materials available
upon request

PG SERIES – PIPE END COVERS

High visibility Chrome Yellow color

Installs without tools

Withstands severe weather conditions:
rain, ice, snow and seals out insects, birds, bird
nests, sand, dust and salt spray

Durable and reusable

ACCESSORY KIT

Used to monitor the air gap between
a rupture disk and relief valve or the presence
of backpressure in a header system.

Kit Includes:

Telltale Stainless Steel 2½”
Dial Pressure Gauge with ¼” MNPT
lower connection

¼” MNPT Stainless
Steel Excess Flow Valve

¼” NPT X 3″
Stainless Steel Nipple

¼” NPT Stainless
Steel Tee

GAUGE TAP

Provides a means of connecting the accessory kit
to the outlet side of rupture disk.

Standard ¼” FNPT

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