About Us

Concept & products


Customer services

Media center




Outperform your rupture disc replacement
Contact us

An easy and safe device to change in the blink of an eye blew up rupture discs

ONIS Quick Rupture Disc Changer (QDC) developed by ONIS permit to one operator to be back in production with an optimal safe and precise overpressure relief system thanks to a rupture disc without using tools and permit to save equipment integrity, save production time and the efficiency of the pressure relief protection.

Save time


No tool

Green design

Pay back

ONIS QDC make you rupture disc change operation safe, efficient and profitable.

How it works ?

How operate it ?

One rupture disc is in line while the other is on hold outside of the pipe. As for a ONIS line blind, the gaskets are accessible for checks or change while the process is running.

As soon as the rupture disc have been activated or need to be checked, After draining the pipe and open the by-pass, one operator will proceed as well as a standard ONIS Line blind : The flange’s spreading movement is generated by efficient and reliable synchronized eccentric shafts which allows the displacement of the slide gate equipped with two rupture disc holders.

Nota : there are only 2 gaskets on the line.

This quick-action clamping mechanism is self-locking and resistant to overpressure and vibration

When your process is back in production, the maintenance team has all the time to change the activated rupture disc.

Why use a QDC ?

Rupture discs are used in order to protect upstream installations from overpressure. The purpose of this pressure relief system is to blow up and keep the integrity of the assets. This rupture disc can be used as a primary level or secondary level. The main applications of rupture discs are in different industries as chemical, pharmaceutical, steel or power industries.

Used in the primary level of protection, the rupture disc has to be changed each time it has been activated. Handling a QDC can be interesting if the frequency of activation is high.

When a rupture disc was used as a secondary pressure relief device, it acts as a mechanical barrier of the downstream equipment against corrosive and chemical attacks.

In this second application, the rupture discs can be checked or change each time is required (each pressure relief valve setting operation which can be every 6 months due to country regulation).

The QDC protect the overpressure but also the corrosion of the downstream pressure relief valve and contributes to limiting the OPEX of the unit.

The QDC can be equipped with two rupture discs in order to proceed to a very quick change or one rupture disc and one blinding disc to permit the operator to do a safe positive isolation of the downstream equipment for maintenance.

Thanks to QDC, time opening of the pipe is drastically reduced and limit exposure of operators and environmental risks.

Technical specifications

All Quick Rupture Disc Changers are designed following these specifications:

  • Forged bodies up to 42”
  • Spreading design with no internal mechanism
  • Perfect sealings – 100 % full bore
  • Motorization available
  • Dimensions Flange to Flange is depending on the rupture disc characteristics

For estimation : please contact us.


Frequently Asked Questions

How is an ONIS device working ?

A ONIS device is mechanical equipment which permits to one person without any tool to spread the pipe thanks to eccentric shafts in order to permit the sliding movement of the gate equipped or not with accessories.

What range of products can you supply ?

We have manufactured equipment from 1’’ to 52’’, up to 420 bars, from -120°C to +650°C Depends on the devices more information on the product page.

Do ONIS devices are compatible with all types of media ? Gas, fluid, with particles ?

All types of media have been operated with ONIS devices. Fluids, gas-charged media with particles, etc.

What is the maintenance needed ?

Only the 4 seals have to be changed when they are damaged. ONIS’s recommendation is to inject grease in grease fittings at least once a year. Out of that, there is no specific maintenance.

Related articles

High performance devices for multiple applications


Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.