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Figure 8 Blinds

Also known as spectacle blinds, figure 8 blinds feature two circular plates connected by a short bar. They are used to interrupt the flow in a piping system when necessary, but they can be reversed and reinstalled to restore flow once maintenance or testing is complete.

When you need a convenient way to control flow in an industrial piping system, consider figure 8 blinds from Hydro Blind Solutions. We have been providing top-quality isolation piping supplies for over 40 years, and we serve businesses throughout the United States as well as globally. We ship products worldwide, and we feature superior service with 24/7 call-out services for emergencies.

Call 409-736-7665 or contact us online to learn the advantages of purchasing figure 8 blinds for your piping system.

How a Figure 8 Blind Works

Figure 8 blinds feature two sides. The first is a solid plate that is similar to a paddle blind. When it’s in place between a set of pipe flanges, it stops all flow within the pipe. This is convenient for hydrostatic testing, maintenance, repairs, and more. The other side of the figure 8 blind is a plate with an opening in the center, similar to a paddle spacer.

With this side in place, full flow is restored to the pipe. The figure 8 blind remains in place on the pipe permanently and is simply flipped to enable or block flow as needed. It eliminates the inconvenience of finding the correct blind or spacer for the application, and it allows for faster maintenance or repair operations.

Specifications & Classes

At Hydro Blind Solutions, we feature figure 8 blinds for nominal pipe sizes ranging from half an inch to 60 inches. All of our figure 8 blinds meet B16.48 specifications, and they are available for purchase in the following classes:

  • Class 150
  • Class 300
  • Class 600
  • Class 900
  • Class 1500
  • Class 2500

We use carbon steel or stainless steel alloys in the manufacture of our spectacle blinds, as well as custom alloys on request. We offer standard milled or machined finishes, and we feature full machining services for the production of custom blinds, flanges, and spacers that are tailored to your needs, including Flat Face (FF) and Ring-Type Joints (RTJ).

Need a specialized blind, spacer, or flange for your piping project? Call Hydro Blind Solutions at 409-736-7665 or contact us online to talk to our experts today.

Industries We Serve

We are proud to provide industrial piping solutions for a wide range of businesses in the United States and beyond, including those in the following industries:

Call Hydro Blind Solutions for Quality Figure 8 Blinds Today

When you need a reliable, leak-free solution for controlling flow in your industrial piping system, turn to our experts at Hydro Blind Solutions. Our figure 8 blinds, paddle blinds, paddle spacers, and blind flanges are manufactured to the highest quality standards for long-lasting durability and performance.

We have over 40 years of industry experience, and we are here 24/7 to help you keep your project on schedule with fast, worldwide shipping so that you can get your products as quickly as possible.

Call 409-736-7665 today or contact us online to request a quote for figure 8 blind sales anywhere in the U.S. or internationally.

Frequently Asked Questions

What are the specifications and classes of figure 8 blinds available?

Figure 8 blinds are available in various sizes and classes to accommodate different piping systems. At Hydro Blind Solutions, they range from half an inch to 60 inches in nominal pipe size, meeting B16.48 specifications.

They are available in classes, including Class 150, Class 300, Class 600, Class 900, Class 1500, and Class 2500. These blinds can be made from carbon steel, stainless steel, or custom alloys upon request, and come in standard milled or machined finishes.

Are figure 8 blinds suitable for high-temperature and high-pressure environments?

Yes, figure 8 blinds are designed to withstand the rigors of industrial environments, including high temperatures and pressures. However, it’s essential to select a blind with the appropriate specifications and material composition for your particular application. Hydro Blind Solutions can guide you in choosing the right product for your environment’s conditions.

What industries commonly use figure 8 blinds?

Figure 8 blinds are versatile and are utilized across various industries. Common industries include refinery, pipeline, construction, oilfield, fabrication, engineering, offshore drilling, and liquefied natural gas. Their ability to quickly and effectively control flow makes them invaluable in these sectors.


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