High Performance Stainless Steel Butterfly Valve

High Performance Stainless Steel Butterfly Valve — Technical Data Sheet

1. Product Overview

This high performance stainless steel butterfly valve adopts a double-offset or triple-offsetdesign. The body and principal internals are manufactured from stainless steel (standard material: ASTM A351 CF8M / 316 SS). It is designed for critical isolation and control applications in the oil & gas, petrochemical, chemical, power generation, marine, and water treatment industries. The valve offers bidirectional tight shut-off, low operating torque, extended service life, and superior corrosion resistance. Fire-safe, anti-static, and low fugitive emission designs are available as options.

Typical Service Media: Water, steam, oil, natural gas, chemicals, sour media containing H₂S, and cryogenic fluids.

2. Applicable Standards & Codes

3. Technical Specifications

4. Materials of Construction

Note: For sour service (H₂S-containing media), all pressure-containing and pressure-controlling components shall comply with NACE MR0175 / ISO 15156.

5. Design Features

• Double-Offset / Triple-Offset Geometry: The sealing surfaces disengage without friction, resulting in low torque and extended service life. Triple-offset design achieves metal-to-metal zero leakage.
• Bidirectional Sealing: The valve provides tight shut-off in both flow directions; either no preferred flow direction or a clearly marked preferred direction.
• Fire-Safe Design: Certified to API 607 / API 6FA upon request. The primary soft seat is backed by a secondary metal seat that ensures reliable shut-off during and after a fire.
• Blow-out Proof Stem: The stem is internally inserted with an integral shoulder, preventing ejection under line pressure.
• Anti-Static Device: Electrical continuity is maintained between the disc, stem, and body to prevent static buildup.
• Low Fugitive Emissions: Stem sealing is designed to meet ISO 15848-1 Class B or TA-Luft requirements. Optional dynamic seal monitoring ports are available.
• In-Line Maintainability: Certain designs allow replacement of the seat and sealing elements without removing the valve from the pipeline (side-entry construction).
• Self-Lubricating Bearings: Upper and lower stem bearings utilize metal-backed self-lubricating materials, reducing operating torque and eliminating the need for routine maintenance.

6. Testing & Inspection

All valves are tested in accordance with API 598 or ISO 5208 prior to shipment.

Hold Time: Shell test minimum 15 seconds (extended for large sizes); seat test minimum 15 seconds.

7. Operation & Actuation

Mounting Standard: ISO 5211 top flange, enabling direct coupling with any compatible actuator. A universal mounting bracket is provided.

8. Certification & Documentation

• Material test certificates with full traceability (EN 10204 Type 3.1)
• Factory acceptance test reports (shell and seat test)
• API 607 / API 6FA fire-safe type approval certificate (where applicable)
• NACE MR0175 material compliance statement
• Fugitive emission type approval (ISO 15848-1)
• Declaration of conformity
• Installation, Operation & Maintenance Manual (IOM)

Optional Third-Party Inspection: Lloyd’s Register (LR), DNV, ABS, CCS, Bureau Veritas (BV), etc.

9. Installation & Service Recommendations

• Valve Installation: Wafer and lug types are installed between mating flanges. Follow any flow direction markings; double-offset designs may feature a preferred flow direction for optimal sealing.
• Flange Bolting: Tighten bolts evenly in a cross-pattern to prevent body distortion that could compromise seat sealing.
• Routine Inspection: Periodically check packing for leakage; adjust gland or replace packing as required.
• Spare Parts Kit: It is recommended to maintain a spare set consisting of seat ring, packing, and bearings for quick field repair.
• Storage: Store in a dry, ventilated area with the disc slightly open (approx. 5–10°) to prevent permanent deformation of the seat.

10. Remarks

This technical data sheet outlines the general specifications for a high performance stainless steel butterfly valve. Final configuration, specific materials, actuator sizing, pressure-temperature ratings, and any supplementary testing shall be subject to the project-specific purchase specification and data sheet. The manufacturer shall submit detailed drawings and calculations for approval after order confirmation.

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