Cast Steel Body Triple Offset Butterfly Valve
Cast Steel Body Triple Offset Butterfly Valve - Image 2
Cast Steel Body Triple Offset Butterfly Valve - Image 3

Cast Steel Body Triple Offset Butterfly Valve

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Description

TECHNICAL DATA SHEET: TRIPLE OFFSET BUTTERFLY VALVE (TOBV)

1. Valve Identification:

  • Type: Triple Offset (Triple Eccentric) Butterfly Valve

  • Operation: Gear Operated / Electric Actuated / Pneumatic Actuated / Lever Operated

  • Design Standard: API 609 / ISO 10631 / BS EN 593

  • Face-to-Face: ASME B16.10 / ISO 5752 Series 20 (Standard) [Specify if Short/Long Pattern]

  • Flange End: ASME B16.5 / ASME B16.47 Series A or B / EN 1092-1 (PN) / JIS B2220 / AS 4087 / ISO 7005 (Specify Pressure Class & Standard)

  • Wafer / Lug / Double Flanged: [Specify Body Type]

2. Design Parameters:

  • Size Range: DN 50 (2″) to DN 1200 (48″) [Typical Range, specify min/max]

  • Pressure Class: ASME: 150, 300, 600, 900 [Specify] | PN: 10, 16, 25, 40 [Specify]

  • Temperature Range: Seated: -29°C to 425°C (-20°F to 800°F) [Dependent on seat material, specify min/max] Unseated: Up to 550°C (1022°F) [Dependent on body/disc material]

  • Design Pressure: Per selected ASME Class or PN Rating at Design Temperature (ASME B16.34 Appendix)

  • Sealing Direction: Uni-Directional (Standard) / Bi-Directional (Optional – Specify)

3. Body & Bonnet:

  • Material: Carbon Steel (A216 WCB), Stainless Steel (A351 CF8/CF8M, A351 CF3/CF3M), Duplex Stainless Steel (A995 4A/5A), Nickel Alloys (Alloy 625, Monel, Inconel) [Specify Grade]

  • Connection: Flanged (RF, RTJ, FF), Wafer, Lug, Double Flanged [Specify Type & Finish]

  • Coating/ Lining: None (Standard) / Internal Epoxy Coating / FBE / Xylan / Others [Specify if applicable]

4. Disc:

  • Material: Solid: Stainless Steel (AISI 316, 17-4PH, F6NM), Duplex Stainless Steel, Nickel Alloys / Hollow: Carbon Steel or Stainless Steel clad with Seat Material [Specify Grade]

  • Design: Triple Offset Geometry (Conical Sealing Surface)

  • Surface Finish (Sealing Area): Ra ≤ 0.8 µm (32 µin) [Typical]

5. Seat:

  • Type: Metal-to-Metal Sealing (Standard)

  • Material: Stainless Steel (304, 316), Stellite 6, Inconel 625, Haynes 276, Rulon® (PTFE Composite – for lower temp) [Specify Grade]

  • Design: Bi-Metallic (Stainless Steel carrier + Hardfaced sealing surface) / Solid Alloy / Resilient Layer (PTFE Composite)

  • Sealing Surface: Conical Profile matching disc geometry. Hardness typically >50 HRC for metal seats.

  • Position: Normally mounted in the body (Can be replaceable cartridge type).

6. Stem:

  • Material: Stainless Steel (A182 F6a, F304, F316, 17-4PH), Duplex Stainless Steel, Monel K500 [Specify Grade]

  • Design: One-Piece, Full Diameter, Blowout-Proof. Triple offset configuration.

  • Sealing: Live-loaded packing system (e.g., Belleville washers) or Bolted gland.

  • Stem Seal: Graphite packing rings / PTFE V-Rings / Combination. Fire-safe design per API 607/API 6FA / ISO 10497.

7. Bearing & Bushings:

  • Upper/Lower Bearings: Self-lubricating composite bushings (e.g., Rulon® J, Turcon®) / Sintered Bronze / Needle Roller Bearings [Specify Type & Material]

  • Thrust Bearings: Tapered roller bearings / Thrust washers (Composite/Metal) [Specify Type & Material]

  • Lubrication: Pre-lubricated, maintenance-free (Standard) / Grease Fittings (Optional)

8. Sealing & Leakage:

  • Seat Leakage Rate: Class VI (Zero Leakage) per API 598 / ISO 5208 (Soft Seat Equivalent) [Standard Target]. Class IV achievable with metal seats. [Specify Test Standard & Class]

  • Stem Leakage: Per FCI 70-2 / ISO 15848-1 (Class B or better typical) [Specify Test Standard & Class]

  • Fire Safe: API 607 / API 6FA / ISO 10497 (Standard) [Specify Certification]

9. Operation:

  • Operating Torque: [Specify Typical Max Operating Torque for size/class or state “Available on Request”]

  • Rotation: 90° (Quarter Turn). Open: Counter-clockwise (Standard – facing actuator side). [Specify if opposite]

  • Position Indicator: Visual (Standard) / Limit Switch Box (Optional) / Position Transmitter (Optional)

  • Actuation: Manual (Lever, Gearbox), Pneumatic (Double Acting, Spring Return), Electric (Modulating/On-Off), Hydraulic [Specify Type & Accessories]

10. Testing:

  • Body Test: Hydrostatic per API 598 / ISO 5208 (1.5x Rated Pressure)

  • Seat Test: Hydrostatic or Pneumatic per API 598 / ISO 5208 (1.1x Rated Pressure) – Both directions if Bi-Directional.

  • Backseat Test: Hydrostatic per API 598 / ISO 5208 (1.1x Rated Pressure) [If applicable]

  • Fire Test: Per API 607 / API 6FA / ISO 10497 (If certified)

  • Documentation: Certified Test Reports available (Manufacturer’s Standard / Customer Request)

11. Applications:

  • Typical Services: Steam (Saturated & Superheated), Hot Oil, Gas (Natural Gas, Flare Gas), Air (Instrument, Plant), Process Water, Hydrocarbons (Crude, Refined Products), Cryogenics (with suitable seat), Power Generation, Petrochemical, Refining, Offshore, LNG, Pulp & Paper. Not suitable for slurry or heavy particulate service.

12. Features & Benefits:

  • Bubble-Tight Shut-off: Achieves Class VI leakage.

  • Zero Friction / Wear: Disc lifts clear of seat before rotation.

  • High Temperature & Pressure Capability: Suitable for severe service.

  • Long Service Life: Minimal wear due to non-rubbing contact.

  • Fire-Safe Design: Certified to relevant standards.

  • Bi-Directional Sealing: Optional.

  • Low Operating Torque: Reduces actuator size/cost.

  • Maintenance-Free Operation: Long intervals, often stem seal only.

  • Compact & Lightweight: Compared to gate/globe valves.

13. Optional Features:

  • Drain / Vent Ports

  • Locking Device

  • Extended Bonnet / Stem (For insulation or high temp)

  • Cryogenic Design

  • Special Coatings (Internal/External)

  • Special Material Trim (e.g., Alloy 625, Hastelloy C276)

  • Positioners, Limit Switches, Solenoid Valves

  • Partial Stroke Test (PST) Capability

14. Manufacturer & Certification:

  • Quality System: ISO 9001:2015 Certified

  • Design Compliance: PED 2014/68/EU (Cat. I-IV as applicable) / CRN / ASME BPV Code Section VIII / Others [Specify Applicable Codes & Markings]

  • Material Traceability: PMI (Positive Material Identification) per EN 10204 3.1/3.2 [Specify]

  • NACE: MR0175/ISO 15156 (If applicable for Sour Service)

Notes:

  1. Replace Brackets: All information within [ ] must be replaced with your specific product data or project requirements.

  2. Highlight Key Features: Emphasize the zero friction principle, bubble-tight shutoff, and fire-safe design as core advantages.

  3. Standards: Ensure the standards listed are correct for your valve design and target market.

  4. Materials: Be precise with material grades and specifications.

  5. Pressure/Temperature: Clearly define the operational envelope based on materials and design.

  6. Leakage: Be realistic about achievable leakage classes, especially with metal seats. “Class VI Equivalent” is a common claim for TOBVs with metal seats.

  7. Application Suitability: The note about slurry/particulates is crucial as TOBVs are generally not suited for these.

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