Product Introduction:

The hard-sealed aluminum bronze wafer-style check valve is a spring-loaded, dual-plate automatic check valve. 

Both the valve body and discs are cast from aluminum bronze, featuring a metal-to-metal hard seal. 

It utilizes a wafer-style installation, clamping directly between two pipe flanges without the need for additional flanges. 

Forward medium pressure pushes the two discs open; when flow stops or reverses, the combination of spring force and backpressure rapidly closes the discs to block backflow, 

requiring no external power source.

Key Application Areas: High-temperature environments, seawater containing sand, chloride-rich environments, oils, and gases. 

The hard-seal design eliminates rubber components, allowing for high-temperature resistance and avoiding issues like rubber aging or failure—distinguishing it from soft-sealed (rubber-seated) models.

Core Advantages:

1. Aluminum Bronze Material Advantages:

Forms a dense protective aluminum oxide film on the surface; resistant to seawater, chloride pitting, and crevice corrosion; 

offers superior resistance to erosion and cavitation compared to standard 316L stainless steel in seawater; 

withstands sediment erosion and resists rusting or seizing—a classic material choice for marine and offshore engineering.

2. Metal Hard-Seal Design:

No rubber sealing rings; offers higher temperature resistance and compatibility with high-temperature media, oils, and hydrocarbons. 

Suitable for media containing solid particles; eliminates problems associated with rubber aging, swelling, or damage, resulting in a longer service life.

3. Spring-Assisted Dual-Plate Structure:

Short disc travel and rapid closing speed effectively reduce water hammer impact; 

suitable for both horizontal and vertical pipeline installations; 

sensitive operation allows for opening even at low flow rates.

4. Wafer-Style Installation:

Compact and lightweight, saving pipeline installation space; 

lower procurement and installation costs compared to flanged check valves, with significant cost-saving advantages for large-diameter applications.

5. Material Compatibility:

Both the valve body and discs are made of aluminum bronze, significantly reducing the risk of galvanic corrosion between dissimilar metals—a critical advantage for seawater piping systems.

Construction:

Valve Body: Cast Aluminum Bronze C95400 / C95800 (QA19-4).

Disc (Dual-plate): Aluminum Bronze; sealing surfaces hard-faced (metal-to-metal hard seal).

Hinge Pin: Monel / Hastelloy (prevents galvanic corrosion with aluminum bronze).

Return Spring: Inconel X750 / Monel; seawater corrosion-resistant and fatigue-resistant.

Valve Seat: Integral metal sealing surface machined on the valve body (hard seal design).

Features: Thin and compact profile, short face-to-face dimension, lightweight; full-bore design, low flow resistance.

Key Technical Parameters:

Model: H76H (Hard seal; "H" denotes metal hard seal).

Nominal Size: DN50 – DN800.

Pressure Rating: PN10 / PN16 / PN25; ASME Class 150 / Class 300.

Temperature Range: -20°C – 200°C (hard seal design avoids rubber-related limitations).

Body Material: C95400 / C95800 Aluminum Bronze (ASTM B148).

Sealing Type: Metal-to-metal hard seal.

Design Standards: API 594, GB/T12224, CB marine series standards.

Applicable Media: Seawater, brine, fresh water, oil products, compressed air, low-pressure steam, fluids containing trace amounts of silt/sediment.

Installation: Horizontal or vertical (upward flow).

Typical Applications:

Marine: Seawater cooling lines, ballast water systems, bilge water systems (CCS marine certification available).

Offshore Engineering: Offshore platforms, seawater desalination, coastal power plant circulating water systems.

Coastal Chemical Industry: Chloride-ion-containing process pipelines (including salt-based chemical processing).

Offshore Oil & Gas: Fluid pipelines for port equipment.

All valves are equipped with professional export protective packaging. 

With protective caps on the sealing surfaces, rust-proof treatment, and shock-absorbing material filling to ensure intact transport; the loading is secure and safe. 

We can also customize packaging according to customer requirements.

Regarding transportation methods, we can provide appropriate transportation options based on the cargo requirements and the customer's timeliness requirements. 

Common transportation methods include: sea freight, air freight, land freight, and express delivery.