The 26-inch (DN650) Class 150 U-type butterfly valve features a C95800 nickel-aluminum-bronze (NAB) disc, specifically engineered for seawater, marine, and offshore applications where standard materials fail due to corrosion. The U-type (split body) design allows easy seat replacement without special tools, while the C95800 disc delivers exceptional resistance to seawater corrosion, biofouling, and erosion.
This valve is ideal for desalination plants, shipbuilding, offshore platforms, coastal water treatment, and any seawater handling system requiring reliable long-term performance.
The C95800 nickel-aluminum-bronze alloy offers unique advantages for seawater service:
| Parameter | Specification |
| Size | 26" (DN650) |
| Type | U-Type Split Body Butterfly Valve |
| Body Material | Ductile Iron ASTM A536 65-45-12 |
| Disc Material | C95800 Nickel-Aluminum-Bronze (ASTM B148) |
| Stem Material | 316 Stainless Steel (Option: 17-4PH / Monel K500) |
| Seat / Liner | EPDM (Option: NBR / Hypalon) |
| Body Coating | Fusion Bonded Epoxy, min 250 microns |
| Pressure Rating | Class 150 / PN16 |
| Flange Standard | ASME B16.5 Class 150 / EN 1092-2 |
| Face-to-Face | API 609 Table 1 (Short Pattern) |
| Design Standard | API 609 / AWWA C504 |
| Test Standard | API 598 / EN 12266-1 |
| Temperature Range | -20°C to +110°C (EPDM) |
| Operation | Worm Gearbox / Pneumatic Actuator |
| Property | C95800 Al-Bronze | SS316 | Ductile Iron + Nylon |
| Seawater Corrosion | Excellent | Moderate (pitting risk) | Good (coating dependent) |
| Erosion Resistance | Excellent | Good | Moderate |
| Biofouling Resistance | Excellent | Poor | Moderate |
| Service Life (Seawater) | 15-20+ years | 3-8 years | 5-10 years |
| Relative Cost | $$$$ | $$ | $ |
C95800 nickel-aluminum-bronze forms a protective oxide film that self-repairs in seawater, making it highly resistant to pitting and crevice corrosion that commonly affect 316 stainless steel. C95800 also has natural biofouling resistance due to its copper content, while 316 SS is prone to marine organism attachment. In seawater service, C95800 typically lasts 3-5 times longer than 316 SS.
A U-type (or split body) butterfly valve has a two-piece body design held together by through-bolts. The body splits along the disc axis, allowing the rubber liner seat to be replaced without removing the valve from the pipeline. This design provides the lowest total cost of ownership because the body outlasts multiple seat replacements.
Yes, the U-type butterfly valve with full rubber lining can be used for dead-end (isolation) service at the full pressure rating. The liner extends beyond the body face to create a gasket seal at both flange connections, providing positive shut-off even when the downstream side is open to atmosphere.
With EPDM lining, the valve operates from -20°C to +110°C (-4°F to +230°F). For higher temperature seawater applications up to 130°C, a special EPDM compound or Viton lining can be specified.
This valve can be supplied with ABS (American Bureau of Shipping), DNV-GL, Lloyd's Register, or CCS classification society certifications upon request. Standard certifications include ISO 9001, CE/PED, and WRAS/NSF 61 for potable water.
For pricing, technical details, or material certifications, contact our sales team.
Email: james@lauxvalve.com | Tel: +86 18920833829
From raw material inspection to final delivery, every butterfly valve undergoes a comprehensive quality inspection to ensure reliable performance and compliance with international standards.
