Triple Offset Butterfly Valve -- Class 600 SS316
Technical Datasheet -- High-Performance Metal-to-Metal Seated Butterfly Valve
Document No.SV-DATA-TOBV-001
RevisionA
DateMay 2026
ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India
Triple offset butterfly valves (TOBV) for critical high-pressure and high-temperature isolation service. The triple-offset geometry (shaft offset from disc centre, shaft offset from pipe centreline, and conical seating surface angle) ensures zero interference between disc and seat during operation, achieving bubble-tight metal-to-metal sealing with minimal wear. Suitable for Class 600 pressure rating and temperatures up to 600 deg C.
Technical Specifications
| Parameter | Specification |
|---|
| Product Type | Triple Offset Butterfly Valve (TOBV) |
| Category | Quarter-Turn Valves |
| Size Range | 6" (DN150) -- other sizes on request |
| Pressure Class | Class 600 per ASME B16.5 |
| End Connections | Wafer or Lug type per API 609 |
| Body Material | ASTM A351 CF8M (SS316) Stainless Steel Casting |
| Disc Material | ASTM A351 CF8M (SS316) with Stellite or Inconel overlay on seating surface |
| Seat Material | SS316 with Stellite / Inconel overlay -- metal-to-metal seal |
| Stem Material | ASTM A276 316 Stainless Steel |
| Seal Type | Triple offset geometry -- conical metal-to-metal seal, zero interference during opening/closing |
| Face-to-Face | API 609 short pattern or ASME B16.10 long pattern |
| Leakage Class | Zero leakage -- metal-to-metal seal achieves bubble-tight shutoff in both directions |
| Temperature Range | -50 deg C to +600 deg C (Stellite overlay) -- higher temperatures with Inconel 625 overlay |
Materials of Construction
| Component | Material |
|---|
| Stainless Steel | ASTM A351 CF8M (SS316), A276 316 |
| Overlay | Stellite 6, Inconel 625, Hastelloy C |
| Stem | ASTM A276 316 with anti-blowout design |
| Bearings | SS316 / PTFE composite self-lubricating |
Testing & Inspection
| Test | Requirement |
|---|
| Testing | Hydrostatic shell test 1.5 x WP per API 598; Seat leakage test 1.1 x WP -- zero visible leakage; Functional test -- full stroke, torque verification; Cryogenic test available on request |
| Certification | ISO 9001:2015 QMS, EN 10204 3.1 material certificates, hydrostatic and seat test reports |
Applicable Standards
| Standard | Description |
|---|
| Design Standard | API 609 Category B / MSS SP-68, ASME B16.34 |
Notes
- All valves are manufactured by Supreme Valves India as per our standard specifications.
- Seat overlay material (Stellite 6 vs Inconel 625) should be selected based on service temperature and corrosion requirements.
- For cryogenic service (below -50 deg C), extended bonnet and cryogenic packing are required.
- For NACE MR0175 sour service, material upgrade to SS316L or duplex SS body and Inconel 625 overlay is required.
- All valves are factory-tested per API 598: hydrostatic shell test 1.5 x design pressure, seat leakage test 1.1 x design pressure (zero visible leakage), functional test (full stroke, torque verification).
