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Help Center316 Stainless Steel Marine Slow Closing Check Valve, DN50-DN300, PN10-40, Flanged Ends, LR ABS Type Approved
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Shanghai Zhibang Valve Manufacture Co., Ltd., established in 2016 with an annual export value of US$1-1.5 million, presents our premium 316 Stainless Steel Marine Slow Closing Check Valve (DN50-DN300, PN10-40). Designed specifically for demanding marine and offshore environments, this valve combines corrosion-resistant 316 stainless steel construction with a dampened closing mechanism to eliminate water hammer and protect piping systems. With LR and ABS Type Approval and ISO9001 certification, we offer a reliable solution that meets international maritime standards. Our valves are shipped from Shanghai, Guangzhou, Hong Kong, and Beijing, serving global markets from North America to Oceania.
The slow closing feature is critical in marine applications where sudden flow reversal can cause severe pressure surges. Our valve uses a spring-assisted disc or tilting disc design that closes gradually, reducing slam and extending service life. The flanged ends conform to ANSI B16.5, DIN, or JIS standards upon request, ensuring easy installation in existing pipelines. Available in sizes DN50 to DN300 and pressure ratings PN10 to PN40, this check valve offers flexibility for various marine systems—from cooling water lines to ballast and fire-fighting systems.
Key Product Features
- Material: Full 316 stainless steel (body, disc, shaft) for superior resistance to seawater corrosion.
- Slow Closing Mechanism: Internal spring or dashpot ensures controlled closure, preventing hammer and noise.
- Flanged Ends: RF/FF faces available; dimensions per ANSI, DIN, or JIS upon request.
- Type Approved: LR (Lloyd’s Register) and ABS (American Bureau of Shipping) type approved for marine use.
- Low Pressure Drop: Optimized flow path minimizes head loss.
- Maintenance-Free: Self-cleaning design with replaceable seat.
- Testing: 100% hydrostatic shell and seat tested per API 6D.
Technical Specifications
| Parameter | Value / Range |
|---|---|
| Nominal Diameter | DN50 – DN300 (2” – 12”) |
| Pressure Rating | PN10 / PN16 / PN25 / PN40 (150# – 300# optional) |
| Body Material | 316 Stainless Steel (CF8M) |
| Disc Material | 316 SS (with PTFE or metal seat) |
| End Connection | Flanged (ANSI B16.5 / DIN / JIS available) |
| Closing Time | Adjustable (typically 2–10 seconds) |
| Operating Temperature | -20°C to +200°C (higher optional) |
| Standards | API 6D, BS 1868, ISO 9001, LR / ABS Type Approved |
Why Choose Our Marine Check Valve?
- Marine-Grade Durability: 316L stainless steel resists pitting and crevice corrosion in chloride environments.
- Eliminates Water Hammer: Slow closing protects pumps, valves, and pipes from damaging pressure spikes.
- Global Compliance: LR and ABS type approval means compliance with major classification societies—ideal for shipbuilding and offshore platforms.
- Customizable: Sizes, pressure ratings, flanges, and trim can be tailored to your specifications.
- Competitive Pricing: As a direct manufacturer with ISO9001 quality management, we offer factory-direct pricing without compromising quality.
Our factory in Shanghai has been serving international clients since 2016, exporting over US$1 million annually to more than 15 regions worldwide. Every valve is 100% pressure tested before shipment and comes with a comprehensive material certificate. We understand the critical nature of marine systems—our slow closing check valve ensures reliable, long-term performance even in the harshest conditions. Contact us today for a quote or technical datasheet, and experience the Zhibang difference in valve engineering.
Frequently Asked Questions (FAQ)
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Q: Is the valve suitable for seawater?
A: Yes, the 316 stainless steel construction provides excellent resistance to seawater corrosion. For extremely aggressive environments, we also offer 316L or duplex options upon request. -
Q: What is the closing time, and can it be adjusted?
A: The slow closing mechanism is factory-set to a typical closing duration of 2–10 seconds. Adjustment is possible by changing the spring or dashpot setting; please consult our engineers for your specific system requirements. -
Q: Do you provide LR and ABS certificates?
A: Yes, our valves are type approved by both Lloyd’s Register and American Bureau of Shipping (LR & ABS). A copy of the certificate can be included with shipment upon request. -
Q: What flange standards are available?
A: We offer flanges per ANSI B16.5 (150#, 300#), DIN PN10/16/25/40, and JIS 10K/20K. Please specify when ordering. -
Q: What about pressure test?
A: Every valve undergoes hydrostatic shell test at 1.5x rated pressure and seat test at 1.1x rated pressure per API 6D. Test reports are issued with each unit. -
Q: Can you provide non-standard sizes or pressure ratings?
A: Yes, we offer customized solutions. For sizes outside DN50–DN300 or pressures beyond PN40, please contact our sales team to discuss feasibility and lead time. -
Q: What is the lead time for a standard order?
A: For typical sizes (DN80–DN200, PN16), lead time is 15–25 working days depending on quantity. Rush orders can be expedited subject to stock availability. -
Q: Do you offer warranty?
A: Yes, we provide a standard 12-month warranty from shipment date covering manufacturing defects. Extended warranty is available as an option.
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