TOBO STEEL GROUP CHINA
| Payment Terms | MoneyGram, MoneyGram, Western Union, T/T, D/A, L/C, D/P |
| Supply Ability | 10000Pcs/month |
| Delivery Time | 15-25days |
| Packaging Details | the wooden case |
| Brand Name | TOBO |
| Model Number | Alloy Steel Flanges |
| Certification | ISO/TUV/SGS |
| Place of Origin | Shanghai, China |
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Product Specification
| Payment Terms | MoneyGram, MoneyGram, Western Union, T/T, D/A, L/C, D/P | Supply Ability | 10000Pcs/month |
| Delivery Time | 15-25days | Packaging Details | the wooden case |
| Brand Name | TOBO | Model Number | Alloy Steel Flanges |
| Certification | ISO/TUV/SGS | Place of Origin | Shanghai, China |
| High Light | ASME B16.5 spectacle blind flange ，Class 150 alloy steel flange ，Quick switch visual status flange | ||
Quick Switch Visual Status Spectacle blind flange ASMEB16.5 Class150
A Spectacle Blind Flange, also known as a Spectacle Blind or *Figure-8 Blind* due to its distinctive shape resembling the number "8", is a vital safety component used in piping systems . It consists of two interconnected metal discs:
One is a solid blind end (a completely closed disc).
The other is a throttling ring end (a ring with an opening the same diameter as the pipe bore) .
This unique design integrates both a blind flange and a spacer ring into a single unit. Its primary function is to provide a reliable and visible method for isolating sections of a pipeline . By rotating the spectacle blind, operators can easily switch the pipeline between an open state (allowing flow through the ring end) and a closed state (completely blocking flow with the solid end) . This makes it an essential device for maintenance, safety, and system configuration.
The design and manufacturing of spectacle blind flanges adhere to various international standards. Key parameters include:
| Parameter | Details & Examples |
|---|---|
| Pressure Ratings (PN) | Common ratings include PN 10 and PN 16 . |
| Size Range | Available in a wide range of diameters to match pipeline dimensions, with specific size series defined in standards like GB/T 4450-1995 for marine use . |
| Materials | Typically made from materials matching the connected pipeline, including carbon steel, alloy steel, and stainless steel . |
| Standards | Conforms to various national and industry standards such as GB/T (China), DIN (Germany, e.g., DIN 86042), and JB/T (China Machinery Standard) . |
| Temperature Range | Operating temperatures vary by standard; for example, spectacle blinds per DIN 86042 are used up to 120 °C . |
Spectacle blind flanges are critical for safety and operational flexibility in numerous industries:
Isolation for Maintenance and Safety: They provide a secure and visible barrier to temporarily or permanently isolate a section of a pipeline . This allows for safe inspection, cleaning, or repair of downstream equipment like valves, pumps, and vessels without draining the entire system. Their robust sealing performance and unmistakable appearance make them a highly reliable isolation method .
Easy Operation Switching: The primary advantage is the quick and clear changeover between operational states . When the ring end is in place, the system operates normally. When isolation is needed, the solid blind end is rotated into position. The distinct shape provides an immediate visual confirmation of the system's status—open or closed—from a distance, preventing operational errors . This is crucial in complex industrial plants where multiple pipelines exist.
Wide Industry Use: They are versatile components found in:
Shipbuilding: Used in various shipboard systems .Petrochemical & Oil Refining: Essential for isolating sections of process lines during turnaround or emergency shutdowns .Power Generation: Used to isolate sections in boiler and steam systems to prevent leaks and ensure safety during upkeep.
I hope this overview provides a clear understanding of spectacle blind flanges. Should you have more specific questions regarding a particular standard or application, feel free to ask.
Company Details
Business Type:
Manufacturer,Agent,Importer,Exporter,Trading Company,Seller
Year Established:
1998
Total Annual:
3,000,000-10,000,000
Employee Number:
200~300
Ecer Certification：
Verified Supplier
TOBO GROUP sales head offce in Shanghai. We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area of 6,8,000square meters, existing 260 workers and 45 technicia... TOBO GROUP sales head offce in Shanghai. We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant covers 550, 000 square meters and a construction area of 6,8,000square meters, existing 260 workers and 45 technicia...
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