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Help CenterDN200 Marine Dual Plate Check Valve Cast Iron PN1.0MPa Stainless Steel Disc EPDM Seal Sour Water Service
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Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our premium DN200 Marine Dual Plate Check Valve, designed for reliable non-return service in demanding sour water and marine environments. Crafted with a robust cast iron body, stainless steel disc, and EPDM seal, this valve delivers excellent corrosion resistance and long-lasting performance under PN1.0MPa pressure. As a manufacturer since 2016, we combine years of expertise with ISO9001 quality management to ensure every valve meets the highest standards. Our dual plate design minimizes pressure drop, reduces water hammer, and offers a compact wafer configuration that saves space and installation costs. Whether for ballast systems, cooling water lines, or offshore platforms, this check valve is engineered to handle harsh fluids without compromise.
Key Features & Technical Specifications
- Material Excellence: Valve body made of high-grade cast iron (GG25) for durability; disc and spring in stainless steel (SS304/316) for superior resistance to sour water and marine corrosion; EPDM seat ensures tight shut-off and chemical compatibility.
- Compact & Lightweight: Wafer style design allows installation between flanges, reducing weight and footprint compared to swing check valves. Ideal for confined spaces on ships and offshore structures.
- Low Pressure Drop: Streamlined dual plates open fully at low flow velocities, minimizing head loss and energy consumption. Spring-assisted closure prevents slamming and water hammer.
- Bi-Directional Flow? The valve is designed for one-way flow only (arrow marked on body). Optional locking or counterweight available upon request.
- Easy Maintenance: Simple internal construction allows quick inspection and replacement of sealing parts without removing the valve from the pipeline.
- Customizable Options: Available with different disc materials (e.g., SS316, Duplex), seal materials (NBR, Viton), and pressure ratings (PN1.6, PN2.5). We also offer flange drilling to ANSI, DIN, or JIS standards as required.
| Parameter | Specification |
|---|---|
| Nominal Diameter | DN200 (8 inch) |
| Pressure Rating | PN1.0MPa (10 bar / 150 psi) |
| Body Material | Cast Iron (GG25) |
| Disc Material | Stainless Steel (SS304/316) |
| Seal Material | EPDM |
| Testing Standard | API 598 / ISO 5208 (hydrostatic & pneumatic) |
| Applicable Medium | Sour water, seawater, oil, gas, and other neutral or aggressive fluids |
| Working Temperature | -20°C to +120°C (depending on seal) |
This check valve is widely used in marine ballast water treatment, offshore oil & gas, desalination plants, and industrial water circulation systems. Its ability to withstand sour service (H₂S environment) makes it a reliable choice for refineries and chemical processing where hydrogen sulfide is present. The stainless steel disc resists pitting and crevice corrosion, while the EPDM seal offers excellent ozone and weathering resistance. Each valve undergoes strict quality inspection including shell and seat leakage tests before shipment.
Why Choose Shanghai Zhibang Valve?
As a dedicated manufacturer with years of experience, we have exported valves to over 15 countries across North America, South America, Europe, Africa, and Southeast Asia. Our annual export value of US$1 million to US$1.5 million reflects the trust international clients place in our products. We hold ISO9001 certification for our quality management system, ensuring consistent production and traceability. Our factory in Shanghai allows convenient shipping from ports like Shanghai, Guangzhou, Hong Kong, and Beijing, with flexible logistics options to meet your deadlines. Every order is backed by professional after-sales support and technical guidance.
Whether you need a standard DN200 marine check valve or a customized solution with special materials, we are ready to assist. Our engineering team can adapt the valve to fit ANSI, DIN, or JIS flanges, and we offer optional features such as locking devices, extended stems, or special coatings. Contact us today for a competitive quote and reliable delivery schedule. Experience the quality and service that has made Zhibang Valve a preferred partner in the valve industry.
Frequently Asked Questions (FAQ)
- Q: Can this valve be used for horizontal piping? Yes, the dual plate check valve can be installed horizontally or vertically (upward flow). For vertical downward flow, consult our team for spring selection.
- Q: What is the warranty period? We offer a standard 12-month warranty from shipment date against manufacturing defects under normal service conditions. Extended warranty is available upon request.
- Q: Is the valve suitable for potable water? While the materials are generally safe, for potable water applications we recommend using EPDM or NBR seal with WRAS or NSF approval. Please confirm with our sales team.
- Q: What is the maximum working pressure for this model? The standard rating is PN1.0MPa (10 bar). Higher pressure ratings such as PN1.6 or PN2.5 can be manufactured with reinforced body design.
- Q: Does the valve come with flanges? No, the wafer type check valve is designed to be clamped between two pipeline flanges. If you need integral flanges, we can supply lugged or flanged end versions as custom orders.
- Q: How to order the correct valve for my system? Please provide the following information: nominal diameter, pressure rating, end connection standard (ANSI/DIN/JIS), fluid type, temperature, and any specific material requirements. We will recommend the optimal configuration.
- Q: What is the lead time for a DN200 valve? Standard production takes 15–25 working days. Urgent orders can be expedited for an additional fee – please contact our sales team for details.
- Q: Can the EPDM seal be substituted with another elastomer? Yes, we offer NBR, FKM (Viton), or PTFE lined seals depending on the chemical compatibility and temperature range. EPDM is standard for sour water due to its resistance to hydrogen sulfide.
For more information or to request a quotation, please reach out to our professional team. We look forward to serving your marine and industrial valve needs.
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