Aluminium Bronze Swing Check Valve
High Performance • Durable • Leak Proof
SKU: AV-CV-0068
Aluminium Bronze Swing Check Valve ensures reliable non-return operation with corrosion-resistant construction.
Aluminium Bronze Swing Check Valve Manufacturer in Africa
Reverse flow in seawater cooling and firewater systems can damage pumps, empty elevated lines and disturb process operation. An Aluminium Bronze Swing Check Valve prevents this movement with a hinged disc that opens under forward flow and returns to the seat when velocity falls. Aluminium bronze construction supports long-term service in marine water and brine. African Valve is a well-known Aluminium Bronze Swing Check Valve Manufacturer in Africa, supplying Nigeria, Egypt, South Africa, Kenya and Ghana and serving shipbuilding, offshore and desalination projects in the Middle East, Europe and other international markets.
How Does the Disc Respond to Flow?
Forward pressure lifts the disc and rotates it around the hinge pin. Once fully open, the disc moves largely away from the flow passage and creates comparatively low resistance. When the pump slows or line pressure reverses, gravity and reverse pressure return the disc to the body seat.
No external power is required. The hydraulic system itself operates the valve. This simplicity is useful, but the closing response depends heavily on line velocity and pump deceleration.
A swing disc travels through a longer arc than the plates in a dual plate check valve. If reverse velocity develops before the disc reaches the seat, the resulting impact can create check-valve slam and pressure surge. Surge-sensitive systems should therefore be studied before selecting this pattern.
Sizing and Orientation Matter
An oversized valve may not receive enough velocity to hold the disc steadily open. The disc can then flutter around a partly open position, wearing the hinge pin, arm and seating surfaces.
Horizontal installation with the cover facing upward is common. Vertical installation is possible where flow travels upward and gravity can assist closure. Downward vertical flow is generally unsuitable unless a special design has been engineered for it.
The body flow arrow must match the actual direction of forward flow. Adequate straight pipe may also be needed near pumps or elbows to reduce turbulence around the disc.
Marine-Grade Material Selection
ASTM B148 C95800 and C95500 are widely used for cast aluminium bronze bodies, covers and discs. Their resistance to seawater corrosion and cavitation makes them suitable for marine and coastal water systems.
The hinge pin, disc arm, seat ring and cover bolting remain exposed to the operating environment. These parts may use aluminium bronze, Monel or another compatible alloy depending on pressure, velocity and water chemistry. Dissimilar-metal combinations should be evaluated for galvanic effects.
Metal seats are common because they tolerate temperature, pressure and repeated contact. Soft-seat inserts can be supplied where lower leakage is required and the selected polymer is compatible with the service.
Technical Specifications
Size Range: DN50 to DN1000
Pressure Ratings: Class 150 to Class 600; PN10 to PN100
Design Standards: BS 1868, API 6D or ASME B16.34
Testing Standard: API 598 or API 6D
End Connections: Flanged RF, FF, RTJ or butt-weld
Operation: Automatic swing-disc action
Functional Benefits
Full-opening disc limits forward-flow restriction.
Automatic operation requires no actuator.
Aluminium bronze pressure parts resist marine water.
Bolted covers provide access to the hinge assembly.
Renewable seat rings may simplify repair.
Counterweight or damping arrangements can be considered for specific systems.
Where Is It Installed?
Typical duties include shipboard seawater systems, desalination intake lines, offshore firewater, ballast systems, condenser cooling and coastal pump stations. It performs best where flow remains stable and pump shutdown is not excessively rapid.
Installation and Flow Review
African Valve can review orientation, line velocity, pressure class, seat material and closing behaviour before manufacture. Project supply can include MTCs, hydrostatic and seat-test reports, PMI records, NDT documentation and dimensional inspection certificates.