The C95800 Bronze Triple Eccentric Butterfly Valve is a high-performance industrial valve manufactured from ASTM B148 C95800 Nickel-Aluminum Bronze (also known as Nickel-Aluminum Bronze). This valve series is engineered to deliver bubble-tight shut-off, exceptional corrosion resistance, and long service life in demanding marine, offshore, and industrial applications .
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Key Technical Specifications:
| Specification | Details |
|---|---|
| Valve Type | Triple Eccentric Butterfly Valve (Metal Seated) |
| Body Connection | Lug Type |
| Size Range | NPS 2", 4", 6", 8", 10", 12" (DN50 - DN300) |
| Pressure Rating | Class 150 (ASME B16.34) |
| Body Material | ASTM B148 C95800 Nickel-Aluminum Bronze |
| Disc Material | C95800 Nickel-Aluminum Bronze / Stellite Hardfaced (optional) |
| Seat Material | Full Metal Seat (C95800 base or Stellite hardfaced) |
| Stem Material | Stainless Steel / Monel K500 |
| End Connection | Lug Type (Suitable for ANSI B16.5 Class 150 flanges) |
| Operation | Manual Lever / Handwheel Gear Operator / Pneumatic / Electric Actuator |
| Face-to-Face Dimension | ISO 5752, API 609, EN 558 |
| Top Flange | ISO 5211 (for direct actuator mounting) |
The Triple Eccentric Design Advantage:
The triple eccentric (triple offset) design is what sets this valve apart from conventional butterfly valves. Three distinct offsets work together to eliminate friction between the disc and seat during operation :
| Offset | Description | Benefit |
|---|---|---|
| Offset 1 | Shaft is positioned behind the sealing surface plane | Provides continuous seat path |
| Offset 2 | Shaft is offset from the pipe/valve centerline | Allows disc to disengage from seat at 90° opening |
| Offset 3 | Seat and cone centerlines are inclined relative to pipe centerline | Completely eliminates rubbing and friction |
Key Advantages of Triple Eccentric Design :
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Zero Leakage: Bidirectional bubble-tight shut-off (metal-to-metal sealing)
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Friction-Free Operation: No rubbing between disc and seat during travel, extending service life
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Fire-Safe Design: Inherently fire safe, no additional certification required
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Low Torque: Reduced operating torque compared to other metal-seated valves
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High Cycle Life: Suitable for frequent on-off and throttling service
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Bi-Directional: Seals tightly in both flow directions
