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Help CenterCast Steel Marine Silent Check Valve, Flanged End, DN100-DN300, PN2.5MPa, Silent Closing for Ship Pipes
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As a professional manufacturer Shanghai Zhibang Valve Manufacture Co., Ltd., we are delighted to introduce our high-quality Cast Steel Marine Silent Check Valve with Flanged Ends, designed specifically for ship piping systems where reliable, low-noise operation is critical. Since 2016, we have focused on producing valves that meet the rigorous demands of marine environments — ensuring durability, safety, and compliance with international standards. This silent check valve effectively prevents backflow while minimizing water hammer and noise, making it an ideal choice for ballast, cooling water, fuel oil, and other onboard pipe networks.
Our silent check valve is engineered with a unique spring-assisted closing mechanism that ensures rapid, chatter-free closure even at low flow rates. The flanged end connection (DN100 to DN300) provides easy installation and maintenance, while the cast steel body offers excellent strength and corrosion resistance in saline and humid conditions. Available with a pressure rating of PN2.5MPa (Class 150 equivalent), this valve is suitable for a wide range of marine applications requiring reliable performance under moderate pressures.
Below you will find detailed technical specifications, product features, and answers to frequently asked questions — all aimed at helping you make an informed purchasing decision.
Key Features & Benefits
- Silent Closing Operation – The spring-loaded disc closes instantly when flow reverses, eliminating water hammer and reducing noise levels significantly compared to conventional swing check valves.
- Durable Cast Steel Body – Made from premium cast steel (WCB, LCB, or stainless steel options), ensuring long service life in marine environments with high salt content and temperature variations.
- Flanged End Connections – Conforms to standard flange dimensions (RF or FF), allowing easy alignment and bolting to ship piping systems without special tools.
- Compact & Lightweight Design – The axial-flow or spring-return design reduces overall length and weight, saving space in confined engine rooms and pump rooms.
- Low Pressure Drop – The streamlined flow path minimizes resistance, maintaining system efficiency and reducing energy consumption of pumps.
- Corrosion-Resistant Materials – Optional stainless steel trim (SS304/SS316) for wetted parts ensures compatibility with seawater, coolants, and hydrocarbons.
- Easy Maintenance – Top-entry or bolted cover design allows quick inspection and replacement of internal parts without removing the valve from the pipeline.
Technical Specifications
| Parameter | Value |
|---|---|
| Size Range | DN100 – DN300 (4″ – 12″) |
| Pressure Rating | PN2.5MPa (Class 150) |
| Body Material | Cast Steel (WCB, LCB, CF8, CF8M) |
| End Connection | Flanged (RF, FF per GB/T 9113 or ASME B16.5) |
| Operation Temperature | -20°C to +200°C (higher with special materials) |
| Applicable Media | Fresh water, seawater, fuel oil, lube oil, air, and other non-aggressive fluids |
| Closing Mechanism | Spring-assisted / Axial flow silent closing |
| Design Standard | API 602, GB/T 19672, ISO 9001:2015 certified |
Our silent check valves undergo rigorous factory testing including hydrostatic shell test (1.5x rated pressure) and seat leak test (1.1x rated pressure) to ensure zero leakage and reliable performance. Every valve is serialized and traceable for quality assurance.
Trust & Quality Assurance
Shanghai Zhibang Valve Manufacture Co., Ltd. has been a reliable valve supplier since 2016. With an annual export value of US$1 Million – US$1.5 Million, we have established long-term partnerships with clients across North America, South America, Europe, Southeast Asia, Africa, Oceania, and the Middle East. Our products are manufactured under strict ISO 9001:2015 quality management system, ensuring consistent quality from raw material inspection to final packaging. We offer flexible shipping from Shanghai, Guangzhou, Hong Kong, or Beijing ports, and our factory in Shanghai welcomes customer audits and inspections at any time. Choose Shanghai Zhibang for marine valves that deliver silent operation, longevity, and peace of mind.
We are confident that our Cast Steel Marine Silent Check Valve will exceed your expectations. Contact us today for a quotation or technical consultation — we look forward to supporting your marine piping projects.
Frequently Asked Questions (FAQ)
-
Q: What is the main advantage of a silent check valve over a conventional swing check valve?
A: A silent check valve uses a spring to close the disc immediately when flow reverses, preventing water hammer and reducing noise. It also operates more reliably at low flow rates and takes up less space compared to a swing check valve. -
Q: Can this valve be used with seawater?
A: Yes, provided the wetted parts are made of corrosion-resistant materials such as stainless steel (CF8M) or duplex stainless steel. We recommend consulting our technical team for specific seawater applications to ensure proper material selection. -
Q: What flange standards do you follow?
A: Our flanged ends are manufactured per GB/T 9113 (PN series) and can also be supplied per ASME B16.5 Class 150 upon request. Please specify your required standard when ordering. -
Q: What is the pressure rating of this valve in other units?
A: PN2.5MPa is approximately equal to 25 bar or 363 psi (Class 150). It is suitable for low-to-moderate pressure marine systems. -
Q: Do you provide certificates of material or testing reports?
A: Yes, we offer material certificates (EN 10204 3.1), hydrostatic test reports, and NDT reports (if required) at an additional cost. Our ISO 9001 certification ensures traceability and quality control. -
Q: What sizes are available for this silent check valve?
A: The standard size range is DN100 (4″) to DN300 (12″). For sizes outside this range, please contact us for custom solutions. -
Q: Can the valve be installed vertically?
A: Yes, our silent check valve can be installed in both horizontal and vertical pipes (upward flow). However, for vertical downward flow, a special spring design may be required — please confirm with our engineers. -
Q: What is the typical delivery time?
A: For standard sizes and materials, delivery time is around 15–25 working days after confirmation. Custom orders may require longer lead times. We ship from Shanghai, Guangzhou, Hong Kong, or Beijing ports.
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