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.
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.
| 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 |
The solid blind section ensures 100% shutoff of pipeline media, preventing leakage and ensuring safety during equipment maintenance.
Quickly rotate between isolation and flow-through states without removing the component, significantly reducing system downtime.
Compatible with spiral wound and graphite gaskets to ensure leak-proof performance under extreme industrial pressures.
Forged or precision-cut from a single block of metal to withstand rigorous mechanical stress and thermal expansion.
Distinct "BLIND" and "SPACER" markings eliminate operational errors, enhancing on-site safety protocols.
Strict adherence to ASME B16.48 ensures full interchangeability with standard flanges worldwide.
Rigorous inspection of dimensional accuracy and material composition for every batch.
Advanced CNC cutting and facing to ensure perfect gasket seating and sealing.
Full traceability with MTR (Material Test Reports) provided for all components.
Optimized stock levels for popular ASME sizes to ensure rapid lead times.
Secure industrial packaging to prevent surface damage during global transit.
Bespoke material and size options to meet unique project specifications.
| 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 |
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.
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.
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.
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.
We provide a comprehensive range from ANSI Class 150 for low-pressure systems up to Class 2500 for extreme high-pressure industrial applications.
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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