Figure 8 Blind Flange: High-Safety Isolation Fitting for Industrial & Municipal Pipelines
1. Product Overview: Essential Pipeline Safety Fitting
Figure 8 Blind Flange, also widely known as a spectacle blind, is a vital safety fitting installed between pipeline flanges for positive mechanical isolation. Shaped like the number eight, this integrated component consists of a solid blind disc and an open spacer ring connected by a linking web. Operators can easily switch between pipeline cut-off and flowing statuses by simply rotating the handle, without the need to remove the entire assembly from the pipeline. The Figure 8 Blind Flange is a crucial safety accessory for both industrial and municipal pipe networks. It complements our complete range of pipeline products, which includes dismantling joints, rubber gaskets, and flanged fittings, providing reliable isolation solutions for engineering projects worldwide.
2. Standard Manufacturing & Diversified Material Selection
Our factory produces Figure 8 Blind Flanges in strict adherence to the ASME B16.48 international standards. We offer a variety of material options to suit different working media and operating environments. Carbon steel A105 is commonly used for conventional water, gas, and general industrial pipelines. For applications involving corrosive fluids, sewage, or coastal projects, we provide 304 and 316L stainless steel options. Additionally, we can customize alloy steel materials for high-temperature and high-pressure conditions, typically found in power plants and petrochemical industries. All of our raw materials are sourced from qualified ingots and undergo precision forging and CNC machining. The smooth machining surface ensures an excellent fit with rubber gaskets, significantly reducing the risk of leaks at flange joints.
3. Complete Specifications & Customizable Surface Treatment
We offer a variety of pressure classes, ranging from Class 150 to Class 2500, and we support nominal diameters from DN15 to DN1200. Our products feature various sealing face types, including Raised Face (RF), Flat Face (FF), and Ring Type Joint (RTJ), to meet different sealing requirements. We can also provide anti-rust painting, oil coating, or customized anti-corrosion surface treatments based on client specifications. Each finished product is clearly marked with its specifications, pressure grade, material grade, and heat number, ensuring that construction teams can easily conduct on-site inspections and identification.
4. Core Structural & Operational Advantages
Compared to traditional separate paddle blinds and spacer rings, the integrated Figure 8 Blind Flange offers significant operational advantages. It helps prevent the loss of loose spare parts during maintenance. When pipelines need to be overhauled, equipment replaced, or systems isolated, construction staff only need to loosen the flange bolts and rotate the fitting. This eliminates the need to carry and install separate Blind Plates. The clear structural difference between a solid disc and a hollow ring allows for easy visual recognition of the pipeline's operational status, effectively reducing the risk of dangerous misoperation—something that ordinary valves cannot achieve. The Figure 8 Blind Flange provides complete physical isolation, eliminating hidden risks associated with internal leakage in valves.
5. Wide Application in Municipal & Industrial Projects
This product is extensively used in water supply and drainage pipe networks, natural gas transmission systems, sewage treatment plants, power station circulating water pipelines, chemical factories, and petrochemical facilities. For projects equipped with valve wells and surface boxes, Figure 8 Blind Flange can be installed together with dismantling joints inside confined spaces to realize controllable pipeline isolation. All goods pass strict dimensional inspection, thickness testing, and appearance check before delivery. Complete material test certificates and inspection documents are offered to facilitate overseas customs clearance and project acceptance.
6. Stable Export Supply & Customized Service Support
We accept customized orders for non-standard sizes, special thickness, and exclusive marking. Products are packed with anti-collision protection to prevent deformation and scratches during long sea transportation. Supported by stable production capacity and rigorous quality management, our Figure 8 Blind Flange has been exported to Southeast Asia, the Middle East, Europe, Africa, and Latin America. We keep improving our pipeline accessory system to supply one-stop, reliable piping solutions for global infrastructure and industrial clients.
If you are sourcing qualified isolation fittings for pipeline projects, welcome to send detailed working parameters, and our technical team will offer targeted recommendations and competitive factory quotations.
