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Help CenterFor Seawater Ballast System, Slow Closing Check Valve, Cast Steel Body, DN80-DN250, Flanged, Anti-Corrosion Coated
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Shanghai Zhibang Valve Manufacture Co., Ltd has been a dedicated manufacturer of industrial valves since 2016, exporting over USD 1 million annually to markets across North America, Europe, Southeast Asia, and the Middle East. Our Slow Closing Check Valve with a Cast Steel Body is specifically engineered for seawater ballast systems on ships and offshore platforms. It effectively prevents backflow and water hammer, ensuring safe and stable operation even under demanding marine conditions. With sizes ranging from DN80 to DN250, flanged connections, and a robust anti-corrosion coating, this valve delivers long service life and low maintenance.
Key Product Features & Technical Specifications
- Slow Closing Mechanism – The valve closes gradually, significantly reducing water hammer pressure surges that can damage pipelines and equipment.
- Cast Steel Body – Made from high-quality cast steel (WCB or equivalent), offering excellent strength and resistance to mechanical stress.
- Anti-Corrosion Coating – Internal and external surfaces are treated with a marine-grade epoxy or zinc-rich primer, providing superior protection against saltwater corrosion.
- Flanged Connection – Designed to standard flange dimensions (DIN/ANSI/BS available upon request) for easy installation and sealing.
- Seawater Compatibility – Trim materials (seat, disc, stem) are selected to withstand high chloride content and prevent galvanic corrosion.
- Low Flow Resistance – Optimized disc design minimizes pressure drop while maintaining reliable sealing performance.
- Long Service Life – Robust construction and coating ensure years of operation with minimal maintenance.
| Parameter | Details |
|---|---|
| Nominal Diameter | DN80 – DN250 (3" to 10") |
| Pressure Rating | PN10 / PN16 (customizable upon request) |
| Face-to-Face Dimension | According to EN 558 / ISO 5752 – basic series |
| Coating Thickness | ≥ 250 μm (epoxy) or as specified |
| Operating Temperature | -10°C to +80°C (extended ranges available) |
| Standards & Certification | ISO 9001:2015, design per API 602 / BS 1873 |
Why Choose Our Slow Closing Check Valve?
- Engineered for Marine Environments – Every component is selected to resist corrosion from seawater, humidity, and biofouling.
- Customizable Options – We offer different flange standards (ANSI 150/300, DIN PN10/16), trim materials (SS304, SS316, duplex), and coating colors.
- Reliable Anti-Water Hammer Performance – The slow closing stroke (adjustable in some models) protects the entire ballast system from costly pressure spikes.
- Competitive Lead Time – As a manufacturer with an annual export value exceeding US$1 million, we maintain adequate stock of raw materials and standard sizes.
- Full Testing Before Shipment – Each valve undergoes hydrostatic shell test, seat leakage test, and coating thickness inspection.
Our factory in Shanghai, China operates with an ISO 9001:2015 certified quality management system, ensuring consistent product quality from raw material procurement to final assembly. We have served customers in North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, the Middle East, Eastern Asia, Western Europe, Central America, Northern Europe, Southern Europe, South Asia, and the domestic market, with a proven track record of on-time delivery. We ship through major ports including Shanghai, Guangzhou, Hong Kong, and Beijing, providing flexible logistics solutions.
Experience the difference of a dedicated valve manufacturer. Whether you need standard sizes or customized designs for a specific seawater ballast project, our team is ready to support you with technical drawings, quotation, and after-sales service. Contact us today to place an order or request a sample for testing.
Frequently Asked Questions (FAQ)
Q1: Can this valve be used for other media besides seawater?
A: Yes, the cast steel body and anti-corrosion coating make it suitable for fresh water, oily water, and many chemical solutions. However, please confirm media compatibility with our technical team when ordering.
Q2: What is the typical closing time of the slow closing mechanism?
A: The closing time is designed to be adjustable within a range of 1–10 seconds depending on the size and spring tension. For DN100, the standard setting is approximately 3–5 seconds. Custom settings can be arranged.
Q3: Do you provide a certification like CE or ABS for marine use?
A: Our valves are manufactured under the ISO 9001 quality system. While we don’t currently hold ABS or CCS certification, we can provide material certificates and test reports that meet common marine requirements. Custom certification can be discussed for large orders.
Q4: What flange standards are available?
A: We supply flanges according to DIN PN10/PN16, ANSI Class 150/300, and JIS 10K/16K as standard. Other flange standards such as BS, GOST, or AS are available upon request.
Q5: How do you ensure the anti-corrosion coating withstands seawater?
A: Our standard coating is a two-component epoxy system with a minimum thickness of 250 microns, applied through a multi-step surface preparation and curing process. Salt spray test (ASTM B117) results exceed 1000 hours without significant corrosion.
Q6: What is the minimum order quantity (MOQ)?
A: For standard sizes DN80–DN250, MOQ is 1 piece for stock items. For non-standard dimensions or special trims, MOQ is typically 5 pieces.
Q7: Can you provide a sample for testing before bulk order?
A: Yes, we offer paid samples with a lead time of 15–20 working days. The sample cost can be deducted from the first bulk order.
Q8: What about after-sales service or warranty?
A: We provide a standard 12-month warranty from the date of shipment against manufacturing defects. Technical support is available by email or remote consultation during the warranty period.
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