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High Precision Figure 8 Blind Manufacturers China Industrial Pipe Blinds Suppliers Factory
Leading China factory and suppliers of Figure 8 blinds. Engineered with a solid blind section for absolute shutoff and a spacer ring for unobstructed flow, our ASME B16.48 compliant components ensure maximum pipeline safety and efficiency.
SupplierCangzhou Weihuan Pipeline Equipment Co.,Ltd.www.weihuantube.com
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About this product
Product information from the supplier.
The Figure 8 Blind is a high-precision industrial pipeline component engineered for seamless switching between absolute isolation and unobstructed flow. Fabricated from a single metal plate shaped like the number "8", it integrates a solid blind section for total media shutoff and a spacer ring section for normal operational flow, eliminating the need for complex disassembly during maintenance.
Designed for the most demanding environments in the petrochemical, power, and pharmaceutical industries, our Figure 8 Blinds are manufactured according to ASME B16.48 standards. Available in a wide array of carbon steel, stainless steel, and special alloys, these components provide a failsafe solution for handling high-pressure, high-temperature, and corrosive media with maximum operational safety.
Detailed Parameters
| Executive Standards | ASME B16.5, ASME B16.48 | Pressure Rating | ANSI Class 150 to 2500 (PN20-PN420) |
|---|---|---|---|
| Nominal Diameter | 1/2" to 48" (DN15 to DN1200) | Temperature Range | -29℃ to 650℃ (Depending on material) |
| Carbon Steel | A105, A350 LF2 | Stainless Steel | 304/304L, 316/316L, 321, 347 |
| Alloy Steel | F11, F22, F91 | Special Alloys | Hastelloy, Monel, Titanium Alloy |
| Facing Types | RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint) | Identification | Engraved "BLIND" & "SPACER" markings |
Key Advantages
Absolute Isolation
The solid blind section ensures 100% shutoff of pipeline media, preventing leakage and ensuring safety during equipment maintenance.
Rapid Switching
Quickly rotate between isolation and flow-through states without removing the component, significantly reducing system downtime.
High-Pressure Seal
Compatible with spiral wound and graphite gaskets to ensure leak-proof performance under extreme industrial pressures.
Structural Strength
Forged or precision-cut from a single block of metal to withstand rigorous mechanical stress and thermal expansion.
Clear Identification
Distinct "BLIND" and "SPACER" markings eliminate operational errors, enhancing on-site safety protocols.
Global Standardization
Strict adherence to ASME B16.48 ensures full interchangeability with standard flanges worldwide.
Product Gallery
Management Platforms
Quality Control
Rigorous inspection of dimensional accuracy and material composition for every batch.
Precision Machining
Advanced CNC cutting and facing to ensure perfect gasket seating and sealing.
Certification Tracking
Full traceability with MTR (Material Test Reports) provided for all components.
Inventory Management
Optimized stock levels for popular ASME sizes to ensure rapid lead times.
Logistics Support
Secure industrial packaging to prevent surface damage during global transit.
Custom Engineering
Bespoke material and size options to meet unique project specifications.
Investment Return Comparison
| Metric | Traditional Blind Plate | Figure 8 Blind |
|---|---|---|
| Installation Time | High (Full replacement) | Low (Quick rotation) |
| Operational Risk | Medium (Part loss risk) | Low (Integrated design) |
| Maintenance Downtime | Extended | Minimal |
| Component Lifecycle | Standard | Enhanced (Less handling) |
| Safety Compliance | Manual Verification | Visual Identification |
Frequently Asked Questions
Q: What is the primary difference between a standard blind and a Figure 8 blind?
A standard blind is a single plate that must be completely removed to restore flow. A Figure 8 blind integrates both the blind and the spacer in one piece, allowing the operator to simply rotate it to switch between isolation and flow-through modes.
Q: Which materials are best for corrosive chemical pipelines?
For highly corrosive environments, we recommend Stainless Steel 316L, Hastelloy, or Titanium alloys, as they offer superior resistance to chemical degradation compared to carbon steel.
Q: Does the Figure 8 blind comply with ASME standards?
Yes, our Figure 8 blinds are manufactured in strict accordance with ASME B16.48 for steel line blanks and ASME B16.5 for flange compatibility.
Q: How do I ensure a leak-proof seal with a Figure 8 blind?
Ensure the flange facing (RF, FF, or RTJ) matches the blind's surface and use high-quality gaskets, such as spiral wound or graphite gaskets, tightened to the correct torque specifications.
Q: What pressure classes are available for these blinds?
We provide a comprehensive range from ANSI Class 150 for low-pressure systems up to Class 2500 for extreme high-pressure industrial applications.
Q: Can Figure 8 blinds be used in low-temperature environments?
Yes, by selecting materials like A350 LF2 carbon steel or specific stainless steels, these blinds can operate safely in temperatures as low as -29℃.
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Cangzhou Weihuan Pipeline Equipment Co.,Ltd.
