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Help CenterMarine Counterweight Check Valve, PN2.5MPa, DN100-DN300, Cast Steel, Flanged Ends, CCS Certified for Marine Pipelines
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Shanghai Zhibang Valve Manufacture Co., Ltd. is a professional manufacturer established in 2016, specializing in high-performance industrial valves. We are proud to introduce our Marine Counterweight Check Valve, designed with precision for demanding marine pipeline systems. This valve combines robust cast steel construction with a counterweight mechanism to ensure rapid and reliable closing, effectively preventing backflow and reducing water hammer risks. With a pressure rating of PN2.5MPa and sizes ranging from DN100 to DN300, it is ideally suited for seawater, ballast, and fuel oil lines on vessels and offshore platforms. All units are factory-tested and carry CCS (China Classification Society) certification, guaranteeing compliance with international marine standards.
Key Features and Technical Specifications:
- Heavy-Duty Cast Steel Body – High strength and corrosion resistance for long service life in harsh marine environments.
- Counterweight Design – Ensures quick and positive closure even under low flow conditions, minimizing reverse flow.
- Flanged Ends – Compliant with ANSI, DIN, or JIS standards (available upon request) for easy installation and maintenance.
- CCS Certified – Meets the rigorous requirements of China Classification Society for safety and reliability in marine applications.
- Pressure Range PN2.5MPa – Suitable for medium-pressure systems common in shipbuilding and offshore engineering.
- Full Size Range DN100 – DN300 – Covering most pipeline diameters used in marine services.
- Low Maintenance – Simple internal structure with no complex springs reduces wear and tear.
| Parameter | Value |
| Pressure Rating | PN2.5MPa (360 psi) |
| Size Range | DN100 – DN300 (4″ – 12″) |
| Body Material | Cast Steel (WCB, WCC, or LCB) |
| Trim Material | Stainless Steel (304/316) or Bronze |
| Flange Standard | GB, ANSI, DIN, JIS (optional) |
| Operation Temp. | -20°C to +200°C (customizable) |
| Certifications | CCS, ISO9001 |
Product Advantages & Customer Benefits:
- Water Hammer Prevention: The counterweight closes the valve instantly when flow reverses, dramatically reducing surge pressures that can damage pipes and equipment.
- Longer Service Life: Cast steel body with anti-corrosion coating resists seawater and oil, extending valve life by years compared to ordinary materials.
- Easy Integration: Flanged ends allow quick bolting to existing pipe flanges, reducing installation downtime.
- Proven Reliability: CCS certification means the valve has passed strict type testing for marine use – a guarantee of quality and safety.
- Versatile Applications: Suitable for seawater cooling, ballast water, fire-fighting, fuel oil, and lubricating oil systems on ships and platforms.
- Cost-Effective: Minimal maintenance requirements and long intervals between overhauls lower total cost of ownership.
Trust & Credibility:
Shanghai Zhibang Valve Manufacture Co., Ltd. is an ISO9001-certified manufacturer with an annual export value of US$1 – US$1.5 million. Our marine check valves are trusted by clients across North America, South America, Europe, Southeast Asia, Africa, and the Middle East. We ship from major ports including Shanghai, Guangzhou, Hong Kong, and Beijing, ensuring fast global delivery. Every valve is tested in our facility before leaving the factory. With over 8 years of expertise in valve manufacturing, we deliver products that combine durability, precision, and value. Contact us today for a customized solution or to request a quotation.
Frequently Asked Questions (FAQ):
Q1: What does CCS certification mean for this valve?
A: CCS (China Classification Society) certification ensures the valve meets stringent standards for strength, materials, and performance required for marine classification. It is accepted by most ship registries worldwide.
Q2: Can this valve be used for seawater applications?
A: Yes. The cast steel body is coated with an anti-corrosion finish, and the trim (seat/disk) can be supplied in stainless steel or bronze to resist saltwater corrosion. Please specify your medium when ordering.
Q3: What is the maximum operating temperature?
A: Standard design covers -20°C to +200°C. For higher or lower temperatures, we can customize materials (e.g., low-temperature carbon steel).
Q4: Are flanges available in different standards?
A: Yes. We offer flanges per GB, ANSI 150/300, DIN PN16/25, and JIS 10K/20K. Please indicate your required standard when placing an order.
Q5: How does the counterweight mechanism work?
A: The counterweight is attached to the valve disk hinge. Under normal forward flow, the disk opens freely. When flow stops or reverses, the weight forces the disk to close rapidly, preventing backflow.
Q6: What is the lead time for production?
A: Typical lead time is 15–30 working days depending on quantity and specifications. We also keep some popular sizes (DN150, DN200) in stock for urgent orders.
Q7: Do you provide a test certificate?
A: Yes. Each valve is hydrostatically tested and accompanied by a factory test certificate. CCS inspection certificates are also available upon request.
Q8: Can I get a sample before bulk order?
A: Yes, sample orders are welcome. We can produce a sample of your required size for evaluation, with a lead time of about 10 days.
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