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Thermax Bellow Seal Valve (TBSV) is a high-performance isolation valve specially designed for zero leakage applications in steam and hazardous fluid systems. Unlike conventional valves, it uses a welded metallic bellows that completely isolates the fluid from the atmosphere, ensuring safe and leak-free operation.
🔧 Key Features
- Zero Leakage Design – metallic bellows prevents any stem leakage
- Maintenance-Free Operation – eliminates frequent gland packing replacement
- Multiple Sealing Points – ensures high safety and reliability
- Stellite Coated Seat & Disc – improves wear resistance and long life
- Low Pressure Drop – efficient flow in steam and thermic fluid lines
- Environment-Friendly – prevents emission of hazardous fluids
📏 Specifications
- Size Range: up to 250 NB
- Pressure Class: up to Class 150 / 300 / 800 and higher
- Temperature Range: up to approx. 515°C (steam applications)
- Body Material: Carbon Steel (WCB), Forged Steel
- Bellows Material: SS 316 Ti
- End Connections: Flanged / Butt Weld / Socket Weld
- Standards: ASME B16.34, API 598
⚙️ Construction
- Body & Bonnet – Carbon Steel / Forged Steel
- Bellows – Welded Stainless Steel (SS 316 Ti)
- Seat & Disc – Stellited for durability
- Stem – Alloy Steel / Stainless Steel
⚙️ Working Principle
- Metallic bellows are welded to the stem and bonnet
- Acts as a barrier between fluid and atmosphere
- Allows linear motion while maintaining a hermetic seal
- Ensures zero emission and no leakage
⚙️ Applications
- Steam and condensate lines
- Thermic fluid systems
- Chemical & petrochemical industries
- Power plants
- Food & pharmaceutical industries
- Oil & gas pipelines
✅ Advantages
- Zero leakage = enhanced safety
- Energy saving (no steam loss)
- Long service life
- Low maintenance cost
- Ideal for hazardous & high-temperature media
⭐ Conclusion
Thermax Bellow Seal Valves are widely trusted for their zero-leak performance, safety, and durability, making them an ideal solution for critical steam and industrial applications where leakage cannot be tolerated.