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Help CenterMarine Dual Plate Check Valve Ductile Iron Wafer Type Epoxy Coating PN10/16 DN50-600 CCS
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Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our Marine Dual Plate Check Valve – a high-performance, durable solution specifically engineered for demanding marine and offshore applications. As a specialized manufacturer with over 8 years of experience and annual export value exceeding US$1 million, we combine precision casting, advanced epoxy coating technology, and rigorous quality control to provide check valves that deliver reliable non-slam operation, corrosion resistance, and long service life. Our wafer-type design is compact, lightweight, and easy to install, making it the ideal choice for shipboard piping systems, seawater service, and ballast water management.
Exceptional Product Features & Technical Specifications
Our dual plate check valve is built with ductile iron body (ASTM A536 GGG40.3) and features a fusion-bonded epoxy coating that provides excellent resistance to seawater, chemicals, and abrasion. The spring-assisted dual plate design ensures quick closing, minimizing water hammer and protecting downstream equipment. The wafer body fits directly between flanges (PN10/PN16), saving space and reducing installation costs.
| Parameter | Specification |
|---|---|
| Body Material | Ductile Iron (ASTM A536 65-45-12) + Epoxy Coating |
| Disc Material | Ductile Iron with EPDM or Nitrile (NBR) Seat Ring |
| Spring Material | Stainless Steel (1.4310 / AISI 301) |
| Pressure Ratings | PN10 / PN16 (150# optional) |
| Size Range | DN50 – DN600 |
| Face-to-Face Length | API 594 (Short Pattern) |
| Coating Thickness | ≥ 250 microns (FBE) |
| Operating Temperature | -10°C to +120°C (depending on elastomer) |
Key Advantages of our Marine Dual Plate Check Valve include:
- Non-Slam Performance – The spring-loaded dual discs close instantly when flow reverses, preventing water hammer and pressure surges.
- Corrosion Resistance – Fusion bonded epoxy coating (FBE) provides superior protection against seawater, salt spray, and aggressive fluids; optional hot-dip galvanizing available.
- Compact & Lightweight – Wafer design reduces weight by up to 60% compared to conventional swing check valves, saving space and structural support costs.
- Low Pressure Drop – Streamlined disc profile and minimal obstruction keep pressure loss low, improving system efficiency.
- Easy Maintenance – All internal components are replaceable; the valve can be serviced without removing from the pipeline.
- Versatile Mounting – Suitable for horizontal or vertical installation (upward flow) and can be installed in any orientation.
- Long Service Life – Ductile iron body combined with elastomer seat rings ensures thousands of cycles without leakage (bubble-tight shut-off).
Our manufacturing facility in Shanghai follows ISO 9001:2015 quality management system. Each valve undergoes hydrostatic testing (body 1.5x rated pressure, seat 1.1x) and 100% dimensional inspection before shipment. With ports in Shanghai, Guangzhou, Hong Kong, and Beijing, we offer flexible logistics to major markets across North America, Europe, Asia, Africa, and Oceania.
Trust & Reliability – Why Choose Shanghai Zhibang Valve?
Since establishment in 2016, Zhibang Valve has delivered over 200,000 valves to satisfied customers worldwide. Our annual export value of US$1-1.5 million reflects global trust in our quality and service. We hold ISO 9001:2015 certification and comply with international standards such as API, BS, and DIN upon request. Our technical team provides free consultation, custom solutions (e.g., special coatings, seat materials, color coding), and after-sales support. Whether you need a standard DN100 check valve for a cargo ship or a DN600 unit for offshore platform, we are your reliable partner. Contact us today for a quote or technical drawing.
Frequently Asked Questions (FAQ)
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Is this check valve suitable for seawater service?
Yes, the ductile iron body with epoxy coating (≥250µm FBE) is specifically designed to resist seawater corrosion. EPDM seat rings are standard; for higher temperatures, Viton is available as an option. -
Can this valve be installed vertically?
Yes, the dual plate check valve can be installed in both horizontal and vertical pipelines (upward flow direction). For vertical downward flow, a spring-loaded model is recommended. -
What is the maximum working pressure?
The standard rating is PN16 (16 bar / 232 psi). For higher pressure up to 400 psi, we offer custom design with reinforced disc and spring – please consult our sales team. -
Does the valve comply with CCS (China Classification Society) or other classification societies?
We can manufacture valves with CCS, DNV, BV, or ABS certificates upon request. Our standard product is designed to meet general marine requirements; third-party inspection can be arranged. -
What is the lead time?
For common sizes (DN50-DN300), lead time is 15-25 working days. Larger sizes or special coatings may require 30-40 days. We have stock for popular sizes; contact us for availability. -
How do I select the correct pressure rating?
Consider your system’s maximum operating pressure and safety factor. Typically PN10 for low-pressure ballast lines; PN16 for main fire or cooling water circuits. We can help you calculate the appropriate class. -
Can I get samples before bulk order?
Yes, we provide samples (up to DN200) with full technical support. Sample cost and shipping are negotiable; once confirmed production order, sample cost can be refunded. -
What warranty do you offer?
We provide a standard 12-month warranty from shipment date covering material and workmanship defects. Extended warranty up to 24 months is available for critical projects.
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