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Help CenterDN80 Marine Wafer Butterfly Check Valve With 316 Stainless Steel Disc for Seawater Resistance
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As a leading manufacturer specializing in industrial valves for demanding applications, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our DN80 Marine Wafer Butterfly Check Valve with a 316 Stainless Steel Disc. Engineered specifically for harsh marine environments, this valve is designed to provide reliable, maintenance-free backflow prevention in seawater cooling systems, ballast systems, fire mains, and other critical offshore and shipboard piping networks. Our focus on robust construction and material selection ensures long-term performance and corrosion resistance, directly addressing the challenges faced by shipbuilders, shipyards, and offshore platform operators.
This valve combines the compact, lightweight design of a wafer-style butterfly check valve with the superior corrosion resistance of 316 stainless steel, making it an ideal solution for space-constrained and weight-sensitive marine installations. The primary goal is to protect pumps and equipment from reverse flow damage while withstanding the corrosive effects of seawater, brackish water, and coastal atmospheres.
Key Features & Technical Advantages:
- Superior Seawater Resistance: The core component, the disc, is precision-machined from Grade 316 Stainless Steel. This material offers excellent resistance to pitting and crevice corrosion caused by chlorides present in seawater, significantly outperforming standard 304 stainless steel or other alloys.
- Compact Wafer Design: The wafer-style body fits snugly between two pipeline flanges, held in place by the flange bolts. This design eliminates the need for separate flange connections on the valve body, resulting in a lighter weight, reduced installation space, and lower overall cost compared to lug-style or flanged check valves.
- Efficient & Low-Pressure Drop Operation: The butterfly disc design allows for a full, unobstructed flow path when open, minimizing turbulence and pressure loss across the valve. A torsion spring ensures quick, positive closing upon flow cessation or reversal, preventing water hammer and protecting upstream equipment.
- Durable Construction & Seal Options: The valve body is typically constructed from ductile iron or carbon steel with a suitable marine-grade coating (epoxy, etc.). The seat ring, which provides the sealing surface, is available in various elastomers like EPDM (for standard seawater), NBR, or Viton® (for higher temperature or chemical resistance), allowing for customization based on specific fluid media.
- Versatile Application Readiness: Designed to meet international standards, this DN80 (3-inch) valve is compatible with common flange standards such as ANSI, DIN, JIS, and GB. It is suitable for a wide range of pressures commonly found in marine systems.
Technical Specifications Table:
| Parameter | Specification |
|---|---|
| Nominal Size | DN80 (3") |
| Disc Material | 316 Stainless Steel (AISI 316) |
| Body Material | Ductile Iron / Carbon Steel (Coated) |
| Seat Material | EPDM, NBR, Viton® (Optional) |
| Connection Type | Wafer, Double Flange Mounting |
| Pressure Rating | PN10/PN16 (or 150/300 LB Class) Available |
| Flange Standard | ANSI, DIN, JIS, GB (Specify Required) |
| Spring Mechanism | Torsion Spring for Automatic Closure |
| Application Media | Seawater, Brackish Water, Cooling Water, Process Fluids |
Benefits for Your Operations:
- Extended Service Life: The corrosion-resistant 316 SS disc drastically reduces maintenance frequency and replacement costs in saline environments.
- Reliable System Protection: Prevents backflow efficiently, safeguarding expensive pumps, compressors, and other equipment from damage.
- Easy Installation & Maintenance: The wafer design simplifies installation between existing flanges. The simple construction allows for easy inspection and seat replacement if necessary.
- Cost-Effective Solution: Offers a balance of performance, durability, and initial investment, providing strong value for marine applications.
Backed by Shanghai Zhibang Valve's commitment to quality, evidenced by our ISO9001 certification, and our experience serving global markets across North America, Europe, Southeast Asia, and beyond, you can trust in the reliability of our products. With an annual export value reflecting consistent international demand, we understand the precise requirements of marine and offshore industries. Our valves are shipped from major ports like Shanghai, Guangzhou, and Hong Kong, ensuring efficient logistics. Choose our DN80 Marine Wafer Butterfly Check Valve for a proven, durable, and application-specific solution that enhances the integrity and safety of your marine piping systems. Contact us today to discuss your project specifications or to request a sample.
Frequently Asked Questions (FAQ)
Q1: Why is 316 stainless steel specifically recommended for the disc in seawater applications?
A: 316 stainless steel contains molybdenum, which greatly enhances its resistance to chloride-induced corrosion, such as pitting and crevice corrosion, common in seawater. It is a standard and reliable material choice for marine environments.
Q2: What is the main advantage of a wafer-style check valve over a flanged check valve?
A: The wafer style is significantly more compact and lighter. It installs between two flanges without needing its own flange bolts, saving space, weight, and material cost, which is crucial on ships and offshore platforms.
Q3: Can this valve be used for fluids other than seawater?
A: Yes. By selecting the appropriate seat material (e.g., EPDM, NBR, Viton®), the valve can handle a variety of other fluids including fresh water, certain oils, chemicals, and gases, within its pressure and temperature ratings.
Q4: What pressure classes are available for this DN80 valve?
A> Standard offerings typically include PN10/PN16 (metric) or 150/300 LB (ANSI) ratings. Other pressure classes can be available upon request depending on your specific design requirements.
Q5: How does the spring mechanism work, and is it replaceable?
A: A torsion spring is integrated to automatically close the disc when forward flow stops or reverses. This ensures quick, positive sealing. The spring assembly is generally designed as part of the internal mechanism and may be replaceable during overhaul, depending on the specific valve design.
Q6: What flange standards do you support?
A: We manufacture valves to match common international standards including ANSI (ASME), DIN, JIS, and GB. It is essential to specify your required flange standard, facing type (RF, FF), and drilling when ordering.
Q7: Is the valve suitable for vertical installation?
A: Yes, wafer butterfly check valves can typically be installed in both horizontal and vertical pipelines with upward flow. It is important to confirm the specific installation orientation requirements for your model.
Q8: Do you offer different sizes besides DN80?
A: Yes, as a manufacturer, we produce a range of sizes. Similar marine wafer butterfly check valves are commonly available from DN50 (2") up to DN300 (12") or larger. Inquire for the full size range.
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