Cryogenic Ball Valve -- Top Entry LNG / LPG SS316
Extended Bonnet Cryogenic Isolation Valve for Ultra-Low Temperature Service
Document No.SV-DS-CRY-001
RevisionRev A
DateMay 2026
ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India
This datasheet covers top-entry full-bore cryogenic ball valves with extended bonnet and stem for LNG, LPG, liquid oxygen, and nitrogen service down to -196°C.
Technical Specifications
| Parameter | Specification |
|---|
| Valve Size Range | DN15 to DN200 (1/2" to 8") |
| Pressure Rating | PN40 / Class 150 / Class 300 / Class 600 |
| Body Material | CF8M (SS316) low-temperature Charpy-tested at -196°C |
| Ball / Seat Material | SS316 / PTFE, PCTFE (Kel-F), PEEK cryogenic grade |
| Bonnet Extension | 150 mm to 400 mm per BS 6364 / ISO 28921-1 |
| Temperature Range | -196°C to +120°C |
| End Connections | Flanged ASME B16.5, butt weld ASME B16.25, socket weld |
| Anti-Static | Spring-loaded ball-to-stem and stem-to-body electrical continuity |
| Fire-Safe | API 607 6th Edition fire-safe certified seat design |
Materials of Construction
| Component | Material |
|---|
| Body | CF8M (SS316) investment casting, solution annealed, Charpy tested at -196°C |
| Ball | SS316 solid ball, lapped to mirror finish, bore matches pipe ID |
| Seat | PTFE or PCTFE (Kel-F) cryogenic grade; PEEK for higher differential pressure |
| Stem | SS316, extended to position packing above vapour zone; anti-blow-out |
| Packing | Graphite + PTFE V-ring set with live-loading spring for thermal contraction compensation |
| Gaskets | Spiral-wound SS316 + graphite for body/bonnet joint |
| Bolting | SS316 A4-80 or B8M class 2 for low-temperature ductility |
Testing & Inspection
| Test | Requirement |
|---|
| Test Standard | API 598 / ISO 5208 / BS 6364 cold-box testing |
| Certification | CE, PED, ATEX, ISO 9001 |
| Cryogenic Test | Helium leak test at -196°C in vacuum chamber |
Applicable Standards
| Standard | Description |
|---|
| Design Standard | BS 6364 / ISO 28921-1 / API 6D / ASME B16.34 |
Notes
- All pressure-containing components are Charpy impact tested at -196°C with minimum 27 J average absorbed energy.
- Extended bonnet length is calculated per BS 6364 to position gland at least 150 mm above predicted frost line; confirm insulation thickness.
- PTFE seats are suitable for most cryogenic service; specify PCTFE or PEEK for higher differential pressure or oxygen service.
- Oxygen service requires special cleaning and degreasing to ASTM G93 Level 300; mark valve body with 'OXYGEN CLEAN'.
- Valves are shipped with end protectors and nitrogen purge to prevent atmospheric moisture ingress during storage.
