Cryogenic Ball Valve -- SS316 Extended Bonnet LNG
Technical Datasheet -- Cryogenic Ball Valves for LNG and Liquid Gas Service
Document No.SV-DATA-CRBV-001
RevisionA
DateMay 2026
ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India
Cryogenic ball valves for liquefied natural gas (LNG), liquid nitrogen, liquid oxygen, and other cryogenic fluid service. Extended bonnet design positions the packing gland above the frost line, preventing ice formation and seal failure. SS316 body with cryogenic-grade PTFE/RPTFE seats tested for flexibility at -196 deg C. Compliant with BS 6364 and API 6D.
Technical Specifications
| Parameter | Specification |
|---|
| Product Type | Cryogenic Ball Valves |
| Category | Ball Valves |
| Size Range | 1/2" to 12" (DN15 to DN300) |
| Pressure Class | Class 150 / Class 300 / Class 600 per ASME B16.5 |
| End Connections | RF / RTJ flanged per ASME B16.5 or butt-weld per ASME B16.25 |
| Body Material | ASTM A351 CF8M (SS316) / ASTM A352 LCC (low-temperature carbon steel) |
| Ball Material | SS316 with ENP or chrome plating |
| Seat Material | Cryogenic PTFE / RPTFE / UHMWPE (retains flexibility at -196 deg C) |
| Stem Material | SS316 with extended bonnet design |
| Bonnet Extension | Extended neck bonnet positions packing gland above the frost line, preventing ice formation on stem seal |
| Temperature Range | -196 deg C to +80 deg C (LNG / liquid nitrogen) -- up to +200 deg C with standard seats |
| Leakage Class | BS 6364 / API 598 -- zero visible external leakage; seat leakage Class A |
| Operation | Extended stem lever with cryogenic glove / Gear operator / Actuator with extended stem coupling |
Materials of Construction
| Component | Material |
|---|
| Stainless Steel | ASTM A351 CF8M (SS316), CF3M (SS316L) -- austenitic SS retains ductility at cryogenic temperatures |
| Low-Temp Carbon Steel | ASTM A352 LCC, A350 LF2 (down to -46 deg C) |
| Seats | Cryogenic-grade PTFE, RPTFE, UHMWPE (tested for flexibility at -196 deg C) |
| Packing | Graphite braided with live-loading (compatible with cryogenic to ambient cycling) |
Testing & Inspection
| Test | Requirement |
|---|
| Testing | Hydrostatic shell test 1.5 x WP per API 598 / EN 12266-1; Seat leakage test per API 598 / EN 12266-1; Functional test -- full stroke, torque verification; Material certificates per EN 10204 3.1 |
| Certification | ISO 9001:2015 QMS, EN 10204 3.1 material certificates, hydrostatic and seat test reports |
Applicable Standards
| Standard | Description |
|---|
| Design Standard | API 6D / API 608, BS 6364 Cryogenic Valves, ISO 17292 |
Notes
- Minimum design temperature must be specified by the purchaser (typical: -196 deg C for LNG, -183 deg C for liquid oxygen, -252 deg C for liquid hydrogen).
- For liquid oxygen service, all components must be degreased and cleaned per ASTM G93 Level 300.
- For liquid hydrogen service, material upgrade to SS316L or aluminium is required.
- Valve must be installed with bonnet vertical (stem upward) to ensure proper drainage and frost-line positioning.
- All valves are manufactured by Supreme Valves India as per our standard specifications.
