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Jiaxing Spectacle Blind Flange
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Name: Jiaxing Spectacle Blind Flange
Material: A516 GR.70+S5
Manufacture Standard: ASME B16.5
Face: RF
Size: 0.75 Inch
Class: 1500LB
Coating: with Black Anti-rust Coating
Feature: Strong Stiffness, Good Sealing
Usage: For Pipeline fittings, Industry, Pressure vessels, Water conservancy, Electricity, power stations, etc
Material: A516 GR.70+S5
Manufacture Standard: ASME B16.5
Face: RF
Size: 0.75 Inch
Class: 1500LB
Coating: with Black Anti-rust Coating
Feature: Strong Stiffness, Good Sealing
Usage: For Pipeline fittings, Industry, Pressure vessels, Water conservancy, Electricity, power stations, etc
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Jiaxing Spectacle Blind Flange: Engineered for High-Pressure Isolation
The Jiaxing Spectacle Blind Flange is a premium pipeline isolation device manufactured in Zhejiang Province, China’s premier hub for flange and fastener production. This component combines a solid blind plate and a ring spacer in a single figure-8 unit, enabling operators to positively isolate or allow flow by rotating the assembly 180 degrees.
Technical Specifications
This spectacle blind flange is crafted from ASTM A516 Gr.70+S5 material. The designation"A516N"indicates the steel is supplied in a normalized condition, which refines the grain structure and ensures stable mechanical properties for high-pressure service at temperatures down to -20°F. The A516 Gr.70 specification is a widely accepted carbon steel plate grade for pressure vessel applications, offering a minimum tensile strength of 70 ksi and excellent weldability.
The flange is manufactured to ASME B16.5 standards for dimensions and tolerances, ensuring interchangeability with existing piping systems. With a size of 0.75 inches and a pressure rating of Class 1500LB, it is designed for high-pressure applications. The Raised Face (RF) design concentrates gasket pressure to achieve a superior seal. A durable black anti-rust coating provides added protection against corrosion during storage, transport, and service.
Applications and Industries
Spectacle blinds provide"positive isolation"—a physical barrier that valves cannot guarantee. This permanent device is essential for applications where safety and absolute shutoff are critical.
In the power generation sector, this flange isolates sections of steam lines, boiler feedwater systems, and turbine bypasses during maintenance. The petroleum and chemical industries rely on spectacle blinds in pipelines carrying hydrocarbons and other hazardous fluids to comply with lock-out/tag-out (LOTO) safety protocols. The water conservancy sector also uses them in large-scale pumping stations and treatment facilities to isolate equipment.
Key applications include:
- Power Stations: For isolating high-pressure steam and feedwater lines during turbine maintenance.
- Oil & Gas: In pipeline pigging traps, meter runs, and utility connection tie-ins.
- Industrial Processing: For positive isolation of pressure vessels, reactors, and heat exchangers.
- Power Stations: For isolating high-pressure steam and feedwater lines during turbine maintenance.
- Oil & Gas: In pipeline pigging traps, meter runs, and utility connection tie-ins.
- Industrial Processing: For positive isolation of pressure vessels, reactors, and heat exchangers.
Built in Jiaxing: A Legacy of Precision Manufacturing
Jiaxing, and particularly its Nanhu District, has established a robust supply chain for the piping industry. The region hosts companies like Zhejiang Yada Green Energy Technology Co., Ltd., a national high-tech enterprise that integrates design, manufacturing, and installation of piping systems. These local manufacturers employ advanced automated equipment—including CNC machining centers, forging presses, and heat treatment furnaces—to produce high-integrity flanges that meet international standards. The Jiaxing spectacle blind flange benefits from this ecosystem, ensuring rigorous quality control, competitive pricing, and reliable delivery for global infrastructure projects. Its robust construction and protective coating make it an ideal choice for demanding industrial environments.
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