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Help CenterMarine Silent Check Valve With 18-Month Warranty, Factory Mill Test Report, DN50-DN300, PN10-PN40
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Shanghai Zhibang Valve Manufacture Co., Ltd. presents our Marine Silent Check Valve, engineered to deliver reliable, noise-free performance in demanding marine environments. As a dedicated manufacturer with over 8 years of industry experience and ISO9001 certification, we combine rigorous factory testing with an 18-month warranty to ensure your pipeline systems operate smoothly. Available in sizes DN50 to DN300 and pressure ratings PN10 to PN40, each valve is accompanied by a comprehensive Factory Mill Test Report, providing documented verification of material quality and pressure integrity. Choose our silent check valve for a trusted solution that minimizes water hammer and extends system lifespan.
Our marine check valves are specifically designed to prevent reverse flow in piping systems while eliminating the loud clatter typical of traditional swing check valves. The silent closing mechanism uses a spring-assisted disc that gently seals against the seat, reducing noise and vibration. This design is particularly beneficial for marine vessels, offshore platforms, and coastal installations where quiet operation is essential for crew comfort and equipment protection.
Key Features & Technical Specifications
- Silent Operation: Spring-loaded disc ensures quick, dampened closure, reducing water hammer and noise levels by up to 85% compared to conventional check valves.
- Durable Construction: Body materials available in cast iron, ductile iron, or stainless steel (optional), suitable for seawater, fresh water, and oil applications.
- Wide Size & Pressure Range: From DN50 to DN300, handling PN10 to PN40 pressures, meeting diverse system requirements.
- Factory Mill Test Report: Each valve is hydrostatically tested and a certified report is provided, verifying shell and seat integrity.
- 18-Month Warranty: Covers manufacturing defects, giving you peace of mind.
- Flanged Connections: Standard wafer or lug type design, compatible with PN10/16/25/40 flanges (DIN/ANSI available upon request).
| Parameter | Value |
| Nominal Diameter (DN) | 50, 65, 80, 100, 125, 150, 200, 250, 300 |
| Pressure Rating (PN) | 10, 16, 25, 40 |
| Operating Temperature | -10°C to +120°C (customizable for higher) |
| Body Material Options | Cast Iron (GG25), Ductile Iron (GGG40), Stainless Steel (CF8/CF8M) |
| Disc Material | Stainless Steel 304/316 |
| Seal Material | EPDM / NBR / Viton (optional) |
| End Connection | Flanged (Wafer or Lug type) – DIN/ANSI |
Customer Benefits
- Reduced Maintenance: The silent, non-slam design minimizes wear on sealing surfaces, extending valve life and lowering replacement costs.
- System Reliability: Prevents reverse flow and protects pumps from damage, ensuring uninterrupted operation in critical marine systems.
- Easy Installation: Compact wafer/lug design fits between standard flanges, saving space and reducing piping stress.
- Compliance Support: Factory test report provides traceability for quality audits and classification society requirements.
- Customization: Available with various sealing materials, coatings (e.g., epoxy), and special end connections to suit specific project needs.
Why Choose Shanghai Zhibang?
Since 2016, we have exported over US$1 million to US$1.5 million annually to markets spanning North America, South America, Europe, Asia, Africa, and Oceania. Our ISO9001-certified quality management system ensures consistent product quality. Each marine silent check valve undergoes rigorous hydrostatic and leak testing before shipment, with the test report included. We ship from major ports: Shanghai, Guangzhou, Hong Kong, and Beijing, ensuring timely delivery worldwide. Our 18-month warranty reflects our confidence in product durability. Contact us today for a quote or technical consultation – let us provide the valve solution that meets your marine application requirements.
Frequently Asked Questions (FAQ)
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Q: What is the main advantage of a silent check valve over a standard swing check valve?
A: Silent check valves use a spring-assisted disc to close quickly and smoothly, eliminating water hammer and loud slamming noise. This protects downstream equipment and provides quieter operation, especially important in marine environments. -
Q: Can this valve be used for seawater applications?
A: Yes, when selected with suitable materials such as ductile iron with epoxy coating or stainless steel, combined with NBR or Viton seals, it is resistant to corrosion in seawater and brackish water. -
Q: Is the Factory Mill Test Report provided for every valve?
A: Absolutely. Each valve is individually hydrostatically tested according to ISO 5208, and a certified test report covering shell and seat tests is included with the shipment. -
Q: What is the warranty period and what does it cover?
A: We offer an 18-month warranty against manufacturing defects in materials and workmanship from the date of shipment. This does not cover damage from improper installation or misuse. -
Q: Can the valve be installed vertically?
A: Yes, our spring-loaded silent check valves can be installed in both horizontal and vertical pipelines, provided the flow direction is upward in vertical installations. -
Q: Do you offer different flange standards?
A: Yes, besides DIN PN flanges, we can supply ANSI Class 150/300 flanges or JIS standard upon request. Please specify your requirement when ordering. -
Q: What is the lead time for DN200 PN16 valves?
A: Typical lead time is 15-25 working days for common sizes and materials. Urgent orders can be expedited – contact our sales team for details. -
Q: Do you provide installation or operation manuals?
A: Yes, each valve comes with a user manual covering installation, maintenance, and troubleshooting guidelines in English.
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