The Blind Flange (BL) is a solid disc-shaped fitting used to permanently or temporarily seal the end of a pipe, valve or vessel opening in industrial piping systems. It is engineered to withstand full system pressure while providing a leak-tight seal, eliminating the risk of fluid or gas leakage.Manufactured from high-quality stainless steel (304/316/316L) or carbon steel (A105/Q235), our blind flanges are precision forged and machined to meet ANSI/ASME B16.5 and other global standards. The fully flat face design ensures uniform contact with mating flanges, forming a reliable seal with standard gaskets. Unlike other closure methods, blind flanges offer superior pressure resistance and can be easily removed for inspection or maintenance, making them ideal for both permanent closures and temporary system isolation.
Why Choose Us / Advantage
Material Traceability: Mill test certificates (MTC) provided for all cast/forged materials.
We accept SGS, BV or TUV inspection at our factory.
Standard sizes in stock; 3-7 days for delivery, 15-30 days for customized orders.
Reinforced plywood cases with fumigation certificates, including flange protectors.
Replacement or repair available for non-artificial damage within the warranty period.
Technical Data
★ Standard: ANSI/ASME B16.5, GB/T 9119, DIN 2527, JIS B2220
★ Body Material: Stainless Steel (304, 304L, 316, 316L); Carbon Steel (A105, Q235, 20#)
★ Pressure Class: Class 150, 300, 600, 900, 1500, 2500 (PN10~PN160)
★ Size Range: DN15 ~ DN2000 (1/2" ~ 80")
★ Face Type: Flat Face (FF), Raised Face (RF)
★ Surface Treatment: Pickling & Passivation (SS) / Anti-rust Oil (CS) / Zinc Plating Optional
Applications
● Petrochemical and oil & gas pipeline end closure and maintenance isolation
● Reserved port blocking in water treatment and municipal water supply pipelines
● Steam and condensate pipeline systems in power plants and thermal power stations
● Manhole and inspection port sealing for pressure vessels and storage tanks
● High-pressure sealing in marine and offshore engineering piping systems
● Temporary or permanent sealing in food and pharmaceutical clean piping systems
