DonadonSDD disc holders are designed in order to ensure maximum reliability to DonadonSDD rupture discs.

HI/F and HR/F flanged disc holders, previous code AZ-60, have been designed to be fitted directly on the piping. They are composed of two flanged parts, complete with steel bolts.

HI/F and HR/F models are fully customisable and can be supplied with different types of couplings that can be fitted with one another:

female or male threaded NPT, Gas, or in accordance with other international standards
butt welding
socket welding

Standard DonadonSDD disc holder materials: Carbon steel, Stainless steel (316L), Alloy 201, Alloy 400, Alloy 600, Alloy C276. Special executions are available in Titanium or Tantalum or with PTFE or glass fibre reinforced PTFE lining.

Reverse acting (or compression) discs, like for example models SCR, Y90 and KRD, are installed in HR/F holders sized in order to protect the dome of the disc and allow correct opening of the disc.