This wafer butterfly valve is specifically configured for seawater and chloride-containing process fluids. The aluminum bronze body and C95800 nickel-aluminum-bronze disc provide excellent resistance to seawater corrosion, erosion, and localized pitting. Compared with ductile iron valves with coatings, the bronze construction offers a solid corrosion-resistant material through the full component cross-section, eliminating coating breakdown and under-film corrosion risk.
The wafer body fits between ANSI, EN, JIS, or BS standard flanges and is clamped by through bolts. The valve is suitable for general isolation and control in seawater intakes, ballast systems, cooling water lines, firewater systems, and desalination plants.
| Feature | Technical Benefit |
|---|---|
| Aluminum bronze body | High resistance to seawater corrosion, erosion, and biofouling; no coating degradation risk. |
| C95800 nickel-aluminum-bronze disc | Excellent strength, corrosion resistance, and resistance to cavitation in seawater service. |
| Wafer body style | Compact, lightweight installation between standard pipe flanges; lower cost than full flange body. |
| Bubble-tight bidirectional seal | Zero visible leakage in both flow directions when tested to EN 12266-1 Rate A / API 598. |
| Blowout-proof shaft | Machined shaft shoulder prevents stem ejection under pressure, meeting API 609 anti-blowout requirements. |
| ISO 5211 top flange | Direct mounting of manual gear, pneumatic, or electric actuators. |
| Low-maintenance construction | Corrosion-resistant internal components reduce inspection frequency and lifecycle cost in marine environments. |
| Item | Specification |
|---|---|
| Body Material | Aluminum Bronze C95800 |
| Disc Material | C95800 Nickel-Aluminum-Bronze |
| Body Style | Wafer, flat or lugged available on request |
| Pressure Rating | PN10 / PN16 / ANSI Class 150 |
| Face-to-Face | API 609 Category A / EN 558 Series 20 short pattern |
| Flange Compatibility | ANSI B16.5 Class 150 / EN 1092 / JIS 10K / BS 4504 |
| Top Flange | ISO 5211, size matched to valve torque |
| Seat Test | 1.1 times rated pressure, bidirectional, zero visible leakage |
| Shell Test | 1.5 times rated pressure, water, per EN 12266-1 / API 598 |
| Operation | Quarter-turn, clockwise to close |
| Parts | Material | Standard |
|---|---|---|
| Body | Aluminum Bronze | ASTM B148 / EN 1982 |
| Disc | C95800 Nickel-Aluminum-Bronze | ASTM B148 |
| Seat | EPDM / NBR / FKM / PTFE | EN 681-1 / ASTM D2000 |
| Shaft | SS316 / 17-4PH / Monel K500 optional | ASTM A276 / A564 |
| Bearing | Bronze | — |
| Seat Material | Typical Temperature Range | Recommended Service |
|---|---|---|
| EPDM | -10°C to +120°C | Seawater, brine, cooling water, and general marine service |
| NBR | -10°C to +80°C | Seawater with hydrocarbons, ballast, and oily water |
| FKM | -15°C to +200°C | Elevated-temperature marine fluids and chemical service |
| PTFE | -25°C to +180°C | Aggressive chemicals, desalination brine, and high-purity process media |
Seawater is highly corrosive to standard carbon steel and cast iron. Aluminum bronze and nickel-aluminum-bronze are widely used in marine and offshore valves because they form a protective oxide surface film that resists general corrosion, pitting, and crevice attack. C95800 is particularly effective in flowing seawater, high-velocity service, and areas subject to cavitation or impingement.
| Industry | Application |
|---|---|
| Marine | Ship ballast, cooling water, firewater, and auxiliary seawater systems |
| Offshore Oil & Gas | Seawater lift, cooling water, firewater pump isolation, and utility piping |
| Desalination | Seawater intake, RO feed, brine discharge, and backwash isolation |
| Power Generation | Once-through cooling water and auxiliary seawater systems |
| Coastal Industry | Plant cooling water, seawater intakes, and outfall systems |
| Aquaculture | Seawater circulation and hatchery utility lines |
The wafer body is supplied with an ISO 5211 top flange for direct actuator mounting. Available operator configurations include:
Factory-mounted operator assemblies are stroke-tested before shipment. Limit switches, positioners, and declutchable manual overrides are available as options.
Each valve receives the following standard inspection and test operations:
Material test certificates per EN 10204 3.1, PMI, and third-party witnessed testing are available on request.
Aluminum bronze resists seawater corrosion, pitting, and erosion without relying on a paint or epoxy coating. This solid material construction eliminates coating failure and under-film corrosion, which are common failure modes for coated ductile iron valves in marine service.
C95800 is a nickel-aluminum-bronze alloy with high strength and excellent resistance to seawater corrosion, erosion, and cavitation. It is commonly used for marine valve bodies, discs, pumps, and propellers.
The standard product is wafer style. A lugged aluminum bronze or C95800 disc configuration is available on request for end-of-line service and downstream pipe removal without upstream shutdown.
EPDM is the standard seat for clean seawater and marine cooling water. NBR may be selected for seawater containing hydrocarbons. For desalination brine or chemical dosing, PTFE or FKM should be evaluated based on temperature and chemical compatibility.
Yes. The ISO 5211 top flange supports manual lever, gear operator, pneumatic actuator, and electric actuator configurations. Factory-mounted and stroke-tested actuator assemblies are available.
From raw material inspection to final delivery, every butterfly valve undergoes a comprehensive quality inspection to ensure reliable performance and compliance with international standards.
