4262 Bluebonnet Drive, Stafford, TX, USA

Onis Line Blind valve: an advanced quick spectacle blind !

Operate in minutes, without tools and outperform conventional pipe isolation methods such as spectacle blinds, slip blinds, figure-8 and blind plates. Onis blinds physically disconnect the pipe and will not allow any leakage from the upstream to downstream as will isolation or double-block-and-bleed valves. Onis blinds, can enable full pipe isolation in minutes, so non-productive time is minimized and significantly optimizes process production, safety and economics. With Onis sealing technology, these products are ideal for the most extreme temperature and dirty process conditions.

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    Onis Line Blind valve: an advanced quick spectacle blind !

    Operate in minutes, without tools and outperform conventional pipe isolation methods such as spectacle blinds, slip blinds, figure-8 and blind plates. Onis blinds physically disconnect the pipe and will not allow any leakage from the upstream to downstream as will isolation or double-block-and-bleed valves. Onis blinds, can enable full pipe isolation in minutes, so non-productive time is minimized and significantly optimizes process production, safety and economics. With Onis sealing technology, these products are ideal for the most extreme temperature and dirty process conditions.

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      The ONIS Quick Action Line blinds are an advanced form of spectacle blinds that lets you keep your process going longer.

      The Onis Quick Action Line blind valve is designed for critical applications according to ASME B16.48 Standard and OSHA 1910.146 US Standard. The technology has superior performance above isolation valves that can allow leakage downstream should the internal sealing elements fail. In contrast, Onis blinds provide a line break that physically separates the upstream and downstream, making it not possible for upstream fluid to migrate downstream. So, this technology is best for critical application services where leakage cannot go downstream if downstream equipment is isolated for maintenance purposes. The Onis blinds also include advanced technologies, including an integrated cam system that enables an operator to perform a line break for pressure containing isolation withing minutes.

      Save time

      Increase safety

      No tools

      Green design

      Get pay back

      How does it work?

      Comparison between the traditional blanking method with a spectacle blind and the method using an ONIS line blind valve.
      Onis offers advanced spectacle blind technologies that optimize isolation performance for critical process applications. These blinds provide significant maintenance time reduction, being over 95% faster than traditional options like figure-8 blinds, spectacle blinds, and paddle blinds or paddle spacers. They enhance safety by ensuring complete isolation from upstream to downstream through physical disconnection and sealing of pipe ends. Moreover, Onis blinds guarantee increased reliability with superior sealing technology that prevents any downstream leakage, even under extreme process conditions.
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      Note: As for the traditional blanking system, before the operation of the ONIS Line blind (QLB), the pipe must be depressurized before starting the blinding operation.

      Caution, even if the product is called Onis line blind valve, it is not a valve because it can’t completely replace a valve due to the pipe opening, it only allows mechanizing a figure-8 blind / spectacle blind flange.

      For every projects we have a suitable size range

      Diameter up to

      Class up to

      Min temperature up to

      Max temperature up to

      Our line blind valve can be equipped with valves to increase safety, check our ONIS Block Bleed & Blind product range.

      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.

      Can ONIS Quick Action Line blind replace a valve?

      No, a mechanized line blind is not a valve. It is a mechanical device which replaces figure 8 or spectacle blind. A line blind is a real positive isolation device and a valve is not: when a valve leaks, the leak is going downstream into the pipe. With a line blind, it is impossible because upstream and downstream pipes are physically separated with a steel plate. More information on the blog article “Positive Isolation Level of piping.”