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Home > Industrial Equipment & Components > Valve > Check Valve > Marine Slow Closing Check Valve With Counterweight and Soft Seal, DN80-DN250, PN16/25, Anti-Water Hammer, LR ABS
Marine Slow Closing Check Valve With Counterweight and Soft Seal, DN80-DN250, PN16/25, Anti-Water Hammer, LR ABS
Product Spotlights
Marine slow-closing check valve with counterweight and soft seal effectively prevents water hammer. Sizes DN80-250, PN16/25. Durable cast steel/stainless steel body, bubble-tight shut-off, adjustable closing time. Compliant with LR/ABS standards. ISO9001 certified manufacturer with global export experience.
Negotiable
MOQ: 1 Unit (Price negotiable depending on order volume and customization)
Key Specifications
Get Latest Price
Application:
Other, Marine piping systems
Size Range:
DN80-DN250
Pressure Rating:
PN16 / PN25
Payment & Shipping
Payment Methods:
Port of Shipment:
China
Delivery Detail:
Delivery time depends on order quantity.
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Application
Other, Marine piping systems
Size Range
DN80-DN250
Pressure Rating
PN16 / PN25
Valve Body Material
Cast Steel / Stainless Steel (Optional)
Connection Type
Flanged (DIN/ANSI available)
Seal Type
Soft Seal (EPDM/NBR/Viton)
Operation Feature
Slow Closing with Counterweight
Anti-Water Hammer
Yes, built-in damping design
Certification
ISO9001, Compliant with LR/ABS standards
Shanghai Zhibang Valve Manufacture Co., Ltd. introduces our premium Marine Slow Closing Check Valve with Counterweight and Soft Seal, designed to meet the most demanding marine and offshore applications. As a manufacturer established in 2016 with annual export value of US$1-1.5 million, we combine rigorous ISO9001 quality management with over 8 years of valve production expertise. This valve series (DN80-DN250, PN16/25) effectively prevents water hammer through its unique slow-closing mechanism, ensuring system safety and longevity. Trusted by clients across North America, Europe, Southeast Asia, and Africa, our check valves are your reliable choice for marine fluid control.
Key Features & Advantages:
- Anti-Water Hammer Design: The integrated counterweight and hydraulic damping cylinder allow controlled closing speed, eliminating pressure surges that can damage pipes and equipment.
- Soft Seal Technology: EPDM/NBR/Viton rubber seat provides zero leakage at low pressure, excellent corrosion resistance, and extended service life.
- Self-Actuating Operation: No external power required – the counterweight automatically returns the disc to closed position upon flow reversal.
- Full Range Availability: Standard sizes from DN80 to DN250 with PN16 or PN25 pressure ratings. Larger sizes and custom pressure classes available on request.
- Marine Certification Ready: Designed to comply with LR (Lloyd's Register) and ABS (American Bureau of Shipping) requirements – suitable for shipbuilding, offshore platforms, and marine water systems.
- Durable Construction: Valve body in cast steel or stainless steel (CF8M) for resistance to seawater corrosion and high pressure.
- Easy Installation: Flanged ends conform to DIN, ANSI, or JIS standards, making retrofit or new system integration straightforward.
| Parameter | Details |
|---|---|
| Size Range | DN80 – DN250 (3" – 10") |
| Pressure Rating | PN16 (16 bar) / PN25 (25 bar) |
| Body Material | Cast Steel WCB / Stainless Steel CF8M |
| Disc/Seat Material | Bronze / Stainless Steel with EPDM/NBR Seat |
| Counterweight Material | Ductile Iron or Stainless Steel |
| Connection | Flanged (DIN 2501 / ANSI B16.5 / JIS B2220) |
| Operating Temperature | -10°C to +120°C (depending on seal material) |
| Anti-Water Hammer Feature | Adjustable closing time via hydraulic damping |
| Design Standard | API 6D / BS 1868 (modified for marine slow-close) |
Why Choose Our Marine Check Valve?
- Proven anti-water hammer performance reduces pipeline fatigue and maintenance cost.
- Soft seal ensures bubble-tight shut-off even after thousands of cycles.
- Counterweight design eliminates the need for external damping devices or power supply.
- Full traceability with material certificates and ISO9001 quality control.
- Customizable flange drilling (ANSI 150/300 or JIS 10K/20K) for global compatibility.
Trust & Reliability: Since 2016, Shanghai Zhibang Valve has exported valves worth US$1-1.5 million annually to over 30 countries, including strict markets like Western Europe and North America. Our ISO9001 certified factory and experienced team ensure consistent product quality. We handle all logistics from Shanghai, Guangzhou, Hongkong, or Beijing ports. Whether you need a single unit or bulk supply for a shipbuilding project, we are your dependable partner. Contact us today for a competitive quote and technical support.
Frequently Asked Questions
1. How does this valve block water hammer?
The counterweight and hydraulic damping cylinder control the closing speed of the disc. When flow reverses, the disc closes slowly (adjustable 2-10 seconds), preventing sudden pressure spikes that cause water hammer.
The counterweight and hydraulic damping cylinder control the closing speed of the disc. When flow reverses, the disc closes slowly (adjustable 2-10 seconds), preventing sudden pressure spikes that cause water hammer.
2. Is this valve suitable for seawater?
Yes, we offer stainless steel body (CF8M) and bronze trim with EPDM or Viton seal, which provide excellent resistance to saltwater corrosion.
Yes, we offer stainless steel body (CF8M) and bronze trim with EPDM or Viton seal, which provide excellent resistance to saltwater corrosion.
3. What certifications can you provide?
Our standard certification is ISO9001. The valve is designed to meet LR and ABS requirements; material certificates, pressure test reports, and type approval documentation are available upon request.
Our standard certification is ISO9001. The valve is designed to meet LR and ABS requirements; material certificates, pressure test reports, and type approval documentation are available upon request.
4. Can I get a different pressure rating, e.g., PN40?
Yes, we can customize the valve to PN40 or higher pressure classes. Please provide your specific requirements for a tailored solution.
Yes, we can customize the valve to PN40 or higher pressure classes. Please provide your specific requirements for a tailored solution.
5. What is the delivery time for a standard order?
Typical lead time for DN80-DN250 is 15-25 working days after confirmation. Urgent orders can be expedited with prior arrangement.
Typical lead time for DN80-DN250 is 15-25 working days after confirmation. Urgent orders can be expedited with prior arrangement.
6. How do I install the counterweight? Is it pre-assembled?
The counterweight is factory-assembled and tested. The valve is ready for installation – simply bolt it between flanges in the correct flow direction (arrow marked on body).
The counterweight is factory-assembled and tested. The valve is ready for installation – simply bolt it between flanges in the correct flow direction (arrow marked on body).
7. Do you offer spare parts for the soft seal?
Yes, we stock replacement seal kits (EPDM, NBR, Viton). We recommend ordering them together with the valve for future maintenance.
Yes, we stock replacement seal kits (EPDM, NBR, Viton). We recommend ordering them together with the valve for future maintenance.
Send Inquiry to This Supplier
1Yr
Business Type
Manufacturer
Year Established
2016
Annual Export Value
US$1 Million - US$1.5 Million
Product Certifications
ISO9001
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