Stainless Steel Spectacle Blind Flange
Why Choose Our Stainless Steel Spectacle Blind Flanges?
Dual-Purpose Functionality
Our spectacle blind flanges feature a unique figure-8 design that combines a solid blind plate and an open ring in a single component. This allows operators to quickly switch between "open" and "closed" positions for pipeline maintenance, inspection, or flow diversion without removing the entire flange assembly. The 316/304 stainless steel construction ensures exceptional corrosion resistance in harsh environments.
Precision Manufacturing from Casting to Finishing
Leveraging our integrated foundry and machining facility in Ningbo, we control every production stage:
|
Investment Casting: |
Minimizes material waste and ensures complex geometry accuracy |
|
CNC Machining: |
Achieves tight tolerances (±0.25mm) for perfect ASME B16.5/B16.48 compliance |
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Surface Finish: |
Ra 3.2μm or better, with optional passivation for enhanced corrosion protection |
Technical Specifications
|
Parameter |
Standard Range |
|
Size |
1/2"–24" (DN15–DN600) |
|
Pressure Class |
150#–2500# (PN10–PN420) |
|
Materials |
304/304L, 316/316L, 321, 347H, F51 Duplex |
|
Standards |
ASME B16.48, MSS SP-44, API 590, EN 1092-1 |
|
Facing |
RF, RTJ, FF |
Custom dimensions and special alloys available upon request.
Quality Assurance & Certifications
Our Ningbo facility operates under ISO 9001 quality management system, with additional PED 2014/68/EU certification for pressure equipment. Each stainless steel spectacle blind flange undergoes:
- 100% dimensional inspection
- PMI (Positive Material Identification) testing
- Liquid penetrant or ultrasonic testing
- Pressure test certification (Material Test Certificate)
Applications & Industries
Our stainless steel spectacle blind flanges serve critical isolation points in:
- Offshore platforms and refineries
- Chemical and pharmaceutical plants
- LNG terminals and cryogenic systems
- High-pressure steam lines
- Corrosive fluid handling pipelines
Our Manufacturing Advantage
Located in China's premier port city, our vertically integrated factory ensures:
- 30-day lead times for standard sizes
- Competitive pricing through direct bulk material sourcing
- Seamless export logistics with FOB/CIF/DDP support
- Flexible MOQ starting from 100 pieces
With 20+ years of OEM experience for European and North American valve manufacturers, we understand international quality expectations and documentation requirements.
Get Your Custom Quote Today
Contact our engineering team for technical drawings, material certificates, or to discuss your specific stainless steel spectacle blind flange requirements. We provide free samples for qualified projects and guarantee on-time delivery worldwide.
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