URA series0 pages

URA Series
Universal Reverse-Acting Rupture Disks

... a breakthrough
in the science of
rupture disk
technology

Unique holder ensures
proper disk orientation

Features

• Single disk design covers 95% of plant requirements
• Scoreless design offers higher cycle life when compared
to scored reverse-acting disks
• Low and high burst pressures available in a single design
• Excels in liquid or gas applications
• 0% manufacturing range is standard
• Operates to 90% of the disk’s rated burst pressure
• Non-fragmenting design
• Withstands full vacuum without vacuum support
• Excellent for isolating safety relief valves
• Damage ratio of 1.0 or less
• Resists product buildup. Only the smooth convex
side of the disk is exposed to the process medium
Additional TFE corrosion protection available
•
(specify URA-L)
• 3–dimensional stainless steel tag is standard
• ASME UD marking available

HOLDER

SHEAR
RING
DISK

PRESSURE
The process pressure is applied to the convex side of the
URA Disk placing the dome of the disk into compression.
As the pressure rises past 90%, the dome becomes
unstable eventually collapsing onto a shear ring that
efficiently cuts the disk wide open upon reversal. The
state-of-the-art shear ring allows the disk to function
on both low pressure and liquid applications.

Bulletin no. 320302 Rev. 2
© 2000, 2004 ZOOK Enterprises, LLC, all rights reserved
Printed in U.S.A. 8-09-2500-12M-CGG