Nickel Aluminum Bronze Valves

Falcon High-Performance Nickel Aluminium Bronze (NAB) Valves (NES 747 / ASTM B148 C95800 / C95400)

At Falcon, we engineer and manufacture heavy-duty Nickel Aluminium Bronze (NAB) Valves built specifically for severe marine, offshore, defense, and high-salinity industrial applications. Cast in premium ASTM B148 UNS C95800 / C95400 and DEF STAN 02-747 (NES 747), our NAB valves offer exceptional resistance to seawater biofouling, cavitation erosion, chloride pitting, and stress-corrosion cracking across demanding marine flow control systems.

Why Choose Falcon Nickel Aluminium Bronze (NAB)?

Nickel Aluminium Bronze is a copper-based alloy fortified with nickel, iron, and aluminium. This metallurgical combination creates an extremely tough, protective nickel-rich oxide film that delivers distinct advantages in seawater and saline environments:

• Superior Resistance to Cavitation & Erosion: High mechanical strength combined with tough metallurgical structure resists high-velocity fluid erosion and cavitation damage in high-flow pump discharge lines.

• Immunity to Marine Biofouling: The natural copper content inherently prevents macro-fouling (mussels, barnacles, and algae growth) inside wetted flow paths without requiring chemical dosing.

• Excellent Crevice & Pitting Corrosion Resistance: Performs exceptionally well in stagnant or slow-moving seawater where standard stainless steels suffer severe crevice attack.

• Non-Sparking & Antimicrobial Properties: Inherently non-sparking for safe deployment in hazardous offshore environments and hydrocarbon vapor zones.

Product Portfolio: Falcon NAB Valve Types 1. NAB Gate Valves

• Design: Heavy-duty Bolted Bonnet (BB), Outside Screw & Yoke (OS&Y), flexible or solid wedge design for full-bore bi-directional isolation.

• Best For: Main seawater intake headers, ballast transfer lines, and offshore platform isolation with minimal pressure drop.

2. NAB Globe Valves

• Design: Precision-machined parabolic plug discs and heavy-duty guided stems for accurate throttling and tight shut-off.

• Best For: Firewater system regulation, cooling water flow control, and sea suction line throttling.

3. NAB Check Valves (Swing, Lift & Dual-Plate Wafer)

• Design: Non-slam, rapid-closing designs equipped with heavy-duty C63000 NAB springs and hinge pins.

• Best For: Preventing backflow in seawater cooling pumps, reverse osmosis high-pressure lines, and bilge discharge systems.

4. NAB Ball Valves (Floating & Trunnion-Mounted)

• Design: 2-Piece and 3-Piece quarter-turn ball valves with PTFE/Devlon or metal-to-metal seating for low-torque, leak-tight operation.

• Best For: Rapid isolation in marine fuel handling, seawater fire mains, and offshore skid modules.

Primary Industrial Applications

• Naval & Defense Sub-Surface / Surface Vessels: Submarine seawater piping, hull valves, weapons cooling loops, and sonar dome flushing systems (compliant with NES 747 standards).

• Offshore Oil & Gas Platforms: Topside seawater cooling systems, firewater deluge mains, water injection manifolds, and FPSO ballast management.

• Seawater Desalination Plants (Thermal & RO): High-salinity brine discharge, intake filtration loops, and pre-treatment seawater transfer pumps.

• Power Generation & Coastal Industrial Plants: Cooling water intake structures, condenser cooling lines, and coastal power station water isolation.

Quality Assurance & Testing Standards

Every Falcon Nickel Aluminium Bronze Valve undergoes comprehensive quality checks prior to release:

• 100% Positive Material Identification (PMI) and optical emission spectrometry to verify exact nickel, iron, and aluminium chemical composition.

• Hydrostatic Shell & Seat Testing per API 598 and ISO 5208.

• Microstructure & Heat Treatment Verification
• Radiographic (RT), Liquid Penetrant (PT), and Ultrasonic (UT)
• EN 10204 Type 3.1 & Type 3.2 Material Test Reports (MTRs) provided for complete heat number traceability.

Contact Falcon for Your Valve Requirements