Triple Offset Metal Seated Butterfly Valve (TOV)
The Triple Offset Metal Seated Butterfly Valve (TOV) represents the pinnacle of butterfly valve technology. Utilizing an advanced “three eccentric” geometry, this valve provides bubble-tight, metal-to-metal sealing capable of handling the most demanding high-temperature, high-pressure, and abrasive applications across industries.
🔑 Core Technology: Triple Offset Geometry
Unlike conventional butterfly valves, the Triple Offset Valve is defined by three distinct offsets that eliminate wear on the sealing surfaces:
- First Offset (Axis Offset): The shaft is offset from the center of the pipe and the seat sealing surface.
- Second Offset (Centerline Offset): The shaft is offset from the center of the valve bore.
- Third Offset (Cone Axis Offset): The axis of the conical sealing surface on the disc is offset from the axis of the shaft.
This geometry ensures that the disc seal only contacts the seat during the final degree of closure, achieving a camming action that provides a tight seal without the scraping wear typical of zero- or double-offset designs.
✨ Key Features and Advantages
| Feature | Detail | Benefit |
| Metal-to-Metal Sealing | Seat and disc sealing surfaces are constructed from different hardnesses of Stainless Steel or specialized alloys. | Zero Leakage Capability: Achieves near bubble-tight shutoff (often fire-safe certified) while resisting corrosion and high temperatures. |
| Durability & Longevity | The eccentric design minimizes seal wear and friction. | Extended Service Life: Operational life often exceeds 30 years, significantly reducing maintenance and replacement costs. |
| Structural Design | Split-body structure allows for precision manufacturing and easier assembly/disassembly of the components. | High Manufacturing Accuracy: Ensures reliable seating and sealing performance under severe conditions. |
| Fast Operation | The quarter-turn (90°) disc rotation mechanism. | Quick Action: Enables rapid opening, closing, and throttling capability. |
| Versatility | Available with Manual, Electric, or Pneumatic actuation options. | Adaptability: Integrates seamlessly into various control and automation systems. |
🌐 Technical Specifications & Applications
| Parameter | Detail |
| Structure Type | Triple Offset (3-Eccentric) |
| Sealing Type | Metal Seated (Hard Seal) |
| Body Style | Wafer, Lug, or Flanged |
| Material Options | Stainless Steel (e.g., SS304, SS316), Carbon Steel, Duplex Steel |
| Flow Control | Isolation (Shutoff) and Throttling (Modulation) |
| Applicable Standards | API 609, ASME B16.34, API 607 (Fire Safe) |
Industries & Media
The TOV is essential in heavy industries due to its resilience:
- Petroleum & Chemical: High-temperature hydrocarbons and corrosive media.
- Power Generation: Main steam lines, feedwater, and flue gas isolation.
- Metallurgy: High-pressure and high-temperature gas and process lines.
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