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Metallic Bellows Stem Seal Isolation and Throttling Valve for Fugitive Emission Control
This datasheet covers bellows seal globe valves with multi-ply SS316L metallic bellows for zero fugitive emissions in toxic chemical, flammable solvent, chlorine, and ammonia refrigeration service.
| Parameter | Specification |
|---|---|
| Valve Size Range | DN15 to DN200 (1/2" to 8") |
| Pressure Rating | PN40 / Class 300 / Class 600 |
| Body Material | CF8M (SS316) cast stainless steel, solution annealed |
| Bellows Material | SS316L multi-ply hydroformed metallic bellows, 10,000+ cycle life |
| Plug Material | SS316 + Stellite 6 hard facing, characterised plug optional |
| Seat Material | Integral SS316 + Stellite 6 overlay; PCTFE soft seat optional |
| Stem Material | SS316, welded to bellows at top, guided by bearings |
| Backup Packing | Graphite braided rings below bellows as secondary seal |
| Gaskets | Spiral-wound SS316 + graphite for body/bonnet joint |
| Temperature Range | -196°C to +425°C (SS316 with graphite packing) |
| End Connections | Flanged ASME B16.5 / BS EN 1092-1, butt weld, socket weld |
| Leakage Class | ANSI/FCI 70-2 Class IV (metal), Class VI (soft seat) |
| Features | Zero emission bellows, secondary packing, long cycle life, live-loading option |
| Component | Material |
|---|---|
| Body | CF8M (SS316) cast stainless steel, solution annealed, machined seat bore and flange faces |
| Bonnet | CF8M (SS316) extended bonnet with bellows compression flange and packing backup chamber |
| Bellows | SS316L multi-ply hydroformed bellows, 0.15 mm plies, fatigue-tested to 50,000 cycles |
| Plug | SS316 with Stellite 6 hard facing; characterised cage-guided plug for throttling service |
| Seat | Replaceable screwed SS316 seat ring; PCTFE insert for Class VI shutoff on request |
| Stem | SS316, ground and lapped, guided by upper and lower bearings, welded to bellows at top |
| Backup Packing | Graphite braided rings with anti-extrusion end rings in secondary gland below bellows |
| Test | Requirement |
|---|---|
| Test Standard | API 598 / ISO 5208 / TA-Luft fugitive emission test |
| Certification | CE, PED, ISO 9001, TA-Luft, ISO 15848-1 Class BH |
| Standard | Description |
|---|---|
| Design Standard | ASME B16.34 / BS 1873 / ISO 15848-1 |