DonadonSDD disc holders are designed in order to ensure maximum reliability to DonadonSDD rupture discs.
Disc holders designed to be mounted between flanges such as HI/A and HR/A have:
an internal diameter sized in order to allow full opening of the disc and total transmission on the minimal discharge area
an external tangent diameter to the bolts in order to facilitate centring between flanges
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.
DonadonSDD disc holders are also provided with two stainless steel assembly plates.
Reverse acting (or compression) discs, like for example models SCR, Y90 and KRD, are installed in HR/A holders sized in order to protect the dome of the disc and allow correct opening of the disc.
| Type | HI/A | HR/A |
| Discs | STD, DCD, SCD, GR | SCR, Y90, KRD |
| Dimensions | From ½”(15) to 40”(1000) | |
| Accessories | Nipples, T connectors, excess flow valve, pressure gauge | |
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.
| Type | HI/F | HR/F |
| Discs | STD, DCD, SCD | SCR, Y90, KRD |
| Dimensions | From 3/4"(20) to 4”(100) | |
| Accessories | Nipples, T connectors, excess flow valve, pressure gauge | |
DonadonSDD disc holders are designed in order to ensure maximum reliability to DonadonSDD rupture discs.
HI/P and HR/P pre-tightened disc holders offer the following advantages:
Easy to install even where access to the pipes is horizontal
Allow for verification of proper installation
Upon request, HI/P and HR/P disc holders can be verified in our laboratories and supplied pre-assembled with their own rupture discs, ready for direct insertion in the plant.
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/P holders sized in order to protect the dome of the disc and allow correct opening of the disc. Therefore the size of HR/P disc holders can be larger.
| Type | HI/P | HR/P |
| Discs | STD, DCD, SCD | SCR, Y90, KRD |
| Dimensions | From 1”(25) to 40”(1000) | |
| Accessories | Nipples, T connectors, excess flow valve, pressure gauge | |
DonadonSDD disc holders are designed in order to ensure maximum reliability to DonadonSDD rupture discs.
HTC standard Sanitary or Clamp holders are stainless steel (AISI 316) with high accuracy internal finishing (<0.6 Ra), allowing minimum particle contamination, low turbulence and low pressure loss.
Clamp disc holders are available with measurements from 1" to 6" and are composed of clamps and sockets.
The indicated sanitary disc holders are suitable for food, dairy, cosmetics and pharmaceutical industries and are commonly used in C.I.P. & S.I.P. processes thanks to their easy installation.
Compact design connections can be supplied upon request for clamped disc holder installation on tanks. This special model is characterised by a finishing of Ra<0.5 mm or better. When using these disc holders, the installed clamp seal will be flush inside the tank wall, thus preventing the so-called "dead leg" on standard clamp sockets. Available from 1” to 4” in stainless steel (AISI 316L).
| Type | HTC | |
| Discs | DCD, SCD, SCR, Y90, KRD | |
| Dimensions | From 1” to 6” | |
DonadonSDD disc holders are designed in order to ensure maximum reliability to DonadonSDD rupture discs.
GR disc holders in graphite have been designed for GR replaceable graphite disc mounting. The GR model has been designed to be fitted directly on piping and is:
composed of two flanged graphite parts
characterised by resistance to aggressive fluids
complete with Graphite and Cork seals
| Type | GR | |
| Discs | G-GR | |
| Dimensions | From 25 to 200 | |