DonadonSDD DIF rupture discs

Model DIF
Materials Stainless steel, Alloy 201, Alloy 400, Alloy 600, Alloy 625, Alloy C276, Titanium
Membrane PTFE, PFA, Stainless steel, Aluminium
Dimensions DN 2”(15) – DN 40”(1000)
Rupture pressure 0.5 - 5 bar g (depending on material and diameter)
Tolerance from +/- 5 % to +/- 20%
Operating temperature membrane in PTFE/PFA max 265°C, up to 480°C (depending on the membrane)
Operating margin up to 70%
Vacuum support Available
Fragmentation No (membrane only)
Use under valve Yes
Corrosion resistance Good - can be protected with a PTFE membrane
Linings Yes
Container Mounted between flanges
Rupture sensor Electrical, Magnetic, Inductive, Optical
PED Certification [CE STAMP] Available
ATEX EX II 2 GD Certification Available

DonadonSDD DIF rupture discs are composite conventional discs formed by four parts:

  • a slotted, perforated metal part
  • a seal membrane (usually in PTFE but also available in many other metallic or non-metallic materials)
  • a protection section
  • a calibration ring

This disc has been designed to be mounted between flanges.
It is excellent for use with gas and liquids in static conditions and excellent for low pressures.
DIF discs react to excessive pressure with total opening in a few milliseconds.
They are therefore recommended for valve protection. Supports may be provided for vacuum or counter-pressure protection.

Composite DonadonSDD rupture discs may also be used for simultaneous protection from pressure and vacuum.