Materials of Construction (MOC)
| Component | Material Specification |
|---|---|
| Body & Bonnet | Stainless Steel (ASTM A351 Gr. CF8/CF8M) |
| Stem / Spindle | SS 304 / SS 316 |
| Seat / Trim | PTFE / RPTFE / Integral |
Technical Specifications
| Parameter | Specification / Standard |
|---|---|
| Manufacturing / Design Standard | ASME B16.34 / API 603 / API 6D |
| Testing Standard | API 598 / EN 12266-1 |
| Pressure Rating | Class 150 to Class 600 / PN16 / PN40 |
Features & Benefits
Zero Emission Bellows Seal
Multi-ply SS316L metallic bellows provides absolute stem seal, eliminating fugitive emissions to atmosphere in toxic and VOC service.
Secondary Packing Backup
Graphite packing gland below bellows acts as emergency secondary containment in the unlikely event of bellows rupture.
TA-Luft and ISO 15848-1 Certified
Independently tested and certified to German TA-Luft and ISO 15848-1 Class BH fugitive emission standards.
Long Bellows Cycle Life
Multi-ply hydroformed bellows tested to 50,000 full-stroke cycles without fatigue failure under rated pressure and temperature.
Live-Loading Packing Option
Belleville spring live-loading on secondary packing maintains constant compression through thermal cycling and packing relaxation.