Aluminum Bronze Butterfly Valves

Excellent Seawater and Brine Resistance: Outstanding resistance to impingement attack and erosion-corrosion in high-velocity seawater and brine service (up to 8-10 m/s), significantly outperforming copper-nickel (90/10) and 316L stainless steel.

High Strength and Wear Resistance: Aluminum bronze offers high strength (UTS ≥655 MPa, YS ≥250 MPa) and excellent galling resistance, suitable for high-velocity and abrasive service.

Excellent Erosion and Cavitation Resistance: Superior resistance to erosion-corrosion and cavitation damage, making aluminum bronze ideal for pump suction/discharge and high-velocity seawater applications.

Good Biofouling Resistance: Aluminum bronze naturally resists marine biofouling, reducing maintenance requirements and preserving flow efficiency.

Non-Sparking: Suitable for hazardous marine environments (fuel handling, flammable cargo).

Cost-Effective Alternative to Titanium: More economical than titanium and super duplex for many seawater applications, while providing comparable performance in high-velocity service.

Excellent Weldability (Nickel Aluminum Bronze): C95800 (nickel aluminum bronze) offers good weldability for field repair.

Multiple Seat Options: EPDM, PTFE, Viton, BUNA-N, and hard seats available.

Multiple End Connections: Wafer, lug, flanged (ASME B16.5).

Pressure Ratings: Class 150 (PN10/PN16) – typically used in low to medium pressure seawater applications.

Temperature Range: Suitable for -40°C to 260°C (-40°F to 500°F) depending on seat material.

International Certifications: Valves can be certified by ABS, BV, DNV, LR, GL, RINA, CCS, KR, NK for marine and shipbuilding applications.

Note: C95800 (nickel aluminum bronze) is the preferred grade for most marine butterfly valve applications due to the nickel addition (4-6%) providing improved corrosion resistance in seawater and better resistance to dealloying.

Raw Material Selection: High-quality Aluminum Bronze (C95400 or C95800) from certified mills with certified chemical composition (Cu rest, Al 9-12%, Fe 3-5%, Ni 4-6% verification) and traceability.

Casting: Valve body and disc cast (centrifugal or sand casting) with strict temperature control.

Heat Treatment: Stress relief annealing at 500-600°C followed by air cooling to relieve casting stresses.

Machining: CNC lathes and machining centers produce precise dimensions – body bore, disc O.D., stem bores, flange faces, and bolt holes.

Disc Machining: Disc machined to precise dimensions for proper seating.

Seat/Liner Molding: EPDM, PTFE, or other elastomer liner molded into body or bonded to disc.

Stem Machining: Stem machined with keyways and bearing surfaces.

Assembly: Body, disc, stem, seat, bearings, and bolting assembled.

Testing: Hydrostatic shell test, seat test (bubble-tight), disc movement verification, torque test.

Marking: Laser engraved with size, pressure, material, heat number, API 609, and ratings.

Pressure Testing: 100% hydrostatic shell test (1.5× rated pressure), seat test (1.1× rated pressure, zero leakage for soft seat).

Material Verification: PMI 100% for body, disc, stem – verification of Cu, Al, Fe, Ni content.

Dimensional Inspection: Face-to-face, flange dimensions, disc seating alignment.

Disc Rotation Verification: 90° rotation smooth, no binding.

Seat Integrity: Bubble-tight test at low pressure.

Hardness Testing: Brinell hardness verification (170-200 HB typical).

Third-Party Inspection: ABS, BV, DNV, LR, SGS on customer request.

Marine Propulsion (Seawater Cooling): Main engine seawater cooling isolation, gearbox cooling water, propeller shaft cooling, stern tube cooling (ABS/BV/DNV/LR certified).

Shipbuilding: Seawater intake lines, ballast water system isolation, fire main piping, cooling water systems, sanitary seawater systems.

Offshore Platforms: Seawater lift pump isolation, firewater system valves, cooling water systems, produced water systems.

Desalination Plants: Brine line isolation, high-velocity brine handling, reverse osmosis feed valves (limited pressure), brine discharge.

Marine Gearboxes and Propulsion Systems: Lubricating oil cooling water control, propeller pitch control systems.

Coastal Power Plants: Seawater intake isolation, condenser cooling water, auxiliary cooling systems.

Aquaculture: Fish farm seawater supply, hatchery temperature control, seawater circulation systems.

Oil and Gas (Marine Terminals): Seawater firefighting systems, cooling water for compressors.

HVAC & Refrigeration (Coastal): Seawater-cooled chillers, cooling tower bypass.

Wastewater Treatment (Coastal): Seawater outfall lines, brine waste systems.

1. Why choose Aluminum Bronze over 316L for seawater butterfly valves?
Aluminum bronze offers superior resistance to impingement attack and erosion-corrosion in high-velocity seawater. 316L suffers from crevice corrosion and pitting in stagnant seawater, while aluminum bronze performs reliably. For velocities above 5 m/s, aluminum bronze is preferred.

2. What is the difference between C95400 and C95800 aluminum bronze?
C95800 (nickel aluminum bronze) contains 4-6% nickel, providing improved corrosion resistance in seawater and better resistance to dealloying. C95800 is the preferred grade for marine butterfly valve applications.

3. What is the maximum velocity for aluminum bronze butterfly valves?
Aluminum bronze can handle seawater velocities up to 8-10 m/s (25-33 ft/s) without significant erosion damage, significantly better than copper-nickel (3 m/s) and 316L (5 m/s).

4. Can aluminum bronze butterfly valves be used in sour service (H₂S)?
Limited. Aluminum bronze is not typically NACE MR0175 certified. For sour service, consider duplex or super duplex butterfly valves.

5. What seat material is best for seawater service?
EPDM (Ethylene Propylene Diene Monomer) is standard for seawater service – excellent resistance to seawater, ozone, and weathering, with temperature range -40°C to 120°C.

6. Is aluminum bronze resistant to biofouling?
Yes, aluminum bronze naturally resists marine biofouling due to copper content, reducing maintenance requirements compared to stainless steel and titanium.

Marine Certified: ABS, BV, DNV, LR, GL approvals available for shipbuilding and offshore.

Complete Type Range: Concentric, double offset, wafer, lug, flanged – all types available.

Multiple Seat Options: EPDM, PTFE, Viton, BUNA-N – select for your seawater conditions.

High Strength: UTS ≥655 MPa, YS ≥250 MPa – stronger than 316L.

Erosion Resistant: Handles high-velocity seawater up to 10 m/s.

Galling Resistant: Excellent wear resistance for high-cycle applications.

100% Pressure Tested: Hydrostatic shell and seat tests on every valve.

Full Traceability: Heat number on body – traceable to raw material.

Cost-Effective: More economical than titanium and super duplex for equivalent seawater service.

Global Delivery: Exported to major shipyards, marine propulsion projects, and offshore facilities worldwide.

Small valves (≤4″): Individual carton boxes with foam inserts.
Medium valves (6″–12″): Plywood cases with foam padding, each valve separated with flange protectors.
Large valves (≥14″): Wooden crates with protective wrapping, flange protectors, lifting lugs, and pallets.

All shipments:

Plastic end caps for wafer/lug ends

Flange protectors for flanged ends

Individual tagging: Size, pressure, material, heat number

Complete documentation: MTR, PMI reports, hydrostatic test reports

Tel / WhatsApp:
Victor: +86 15575100681
Jack: +86 18390957568

Website: www.womicstainless.com
E‑mail: info@womicstainless.com

Contact Womic Steel today for a competitive quote on Aluminum Bronze butterfly valves. We offer certified quality, marine classification approvals, multiple seat options, fast production lead times, and reliable global delivery for your marine, shipbuilding, and seawater projects.

Stock Examples (Concentric Wafer Aluminum Bronze Butterfly Valves – Class 150 – EPDM Lined – Seawater Service):

Stock Examples (Lug Style Aluminum Bronze Butterfly Valves – Class 150 – EPDM Lined – Dead-End Service):

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