Zeron Fastners
Industrial Valves & FastenersBellow Sealed Gate Valves
Bellow Sealed Gate Valves are ultra-critical zero-fugitive-emission isolation valves engineered with a flexible, multi-ply hydroformed metallic bellow cartridge welded directly between the valve stem and bonnet. By replacing traditional dynamic packing friction with a hermetic metallic barrier, bellow sealed gate valves completely prevent toxic gases, volatile organic compounds (VOCs), radioactive media, and hot thermal oil from escaping to atmosphere, satisfying the strictest EPA Clean Air Act and TA-Luft environmental standards.
Zeron Fastners manufactures API 602 and ASME B16.34 Bellow Sealed Gate Valves in Class 150#, Class 300#, and Class 800# in sizes 1/2" to 16". Features multi-ply Inconel 625 or SS 316Ti bellows tested for over 10,000 full stroke cycles, supplemented by a secondary graphite emergency gland packing seal.
Technical Specifications
| Specification Feature | Details & Standard Compliance |
|---|---|
| Design Standards | ASME B16.34, API 602, BS 5352, EN 13709 |
| Size Range | 1/2" to 16" (DN15 - DN400) |
| Pressure Ratings | Class 150#, Class 300#, Class 800#, PN16 to PN100 |
| Bellow Material | Multi-Ply Hydroformed Inconel 625, Hastelloy C276, Stainless Steel 316Ti |
| Cycle Endurance | 10,000+ Full Cycles Guaranteed (Hermetic Zero Leakage Barrier) |
| Secondary Packing | Live-Loaded Pure Flexible Graphite with Anti-Blowout Stem Shoulder |
| Body Materials | ASTM A105N, A216 WCB, A182 F316/F316L, A351 CF8M, Alloy 20 |
| Emission Standards | TA-Luft ISO 15848-1 Class AH / EPA Method 21 Compliant |
| Testing Standard | API 598, BS EN 12266-1, Helium Mass Spectrometer Leak Tested |
Zero Emission Applications
| Type & Model | Key Features & Operating Applications |
|---|---|
| Hot Thermal Oil Loops | Guarantees zero packing leakage or smoking on heat transfer fluid lines up to 400°C. |
| Toxic & Carcinogenic Media | Zero emission hermetic barrier for chlorine, phosgene, hydrogen sulfide, and benzene. |
| High Pressure Steam Systems | Eliminates chronic steam packing leaks and wire-drawing erosion in power plants. |
| Vacuum Service Gate Valves | Maintains high vacuum integrity without inward atmospheric air contamination. |
