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Help CenterMarine Check Valve With Counterweight, Cast Steel Body, DN50-DN300, Pressure Rating PN1.0-4.0MPa, CCS Type Approved
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Shanghai Zhibang Valve Manufacture Co., Ltd. (established in 2016) is proud to offer a high-performance Marine Check Valve with Counterweight, designed specifically for demanding shipboard and offshore applications. With a robust cast steel body, a wide size range from DN50 to DN300, and pressure ratings from PN1.0 to PN4.0 MPa, this valve ensures reliable backflow prevention even under severe operating conditions. Each valve carries CCS Type Approval, guaranteeing compliance with international marine standards. As an ISO9001 certified manufacturer exporting over US$1 million annually to markets across North America, Europe, Asia, Africa, and Oceania, we combine engineering excellence with global service support.
Our counterweight check valve excels in minimizing water hammer, reducing disc slamming, and providing a tight seal against reverse flow. The added counterweight mechanism ensures smooth and quiet closure, making it ideal for ballast systems, cooling water lines, fire-fighting piping, and other marine fluid systems. Below, you will find detailed technical characteristics, parameter tables, and benefits that make this valve a trusted choice for shipbuilders and offshore engineers worldwide.
Product Features & Technical Specifications
- Cast Steel Body: Durable and corrosion-resistant, suitable for seawater and freshwater marine environments.
- Counterweight Design: Provides a stable closing force, reducing disc flutter and extending valve service life.
- Full Range of Sizes: DN50, DN65, DN80, DN100, DN150, DN200, DN250, DN300 – custom diameters available upon request.
- Pressure Class: PN1.0, PN1.6, PN2.5, PN4.0 MPa (other ratings optional).
- Flanged End Connections: Conforms to DIN, ANSI, JIS, or GB standards; customization possible.
- CCS Type Approved: Certified by China Classification Society for marine use.
- Low Maintenance: Sealed bearing design reduces need for frequent lubrication.
- Bi-Directional Option: Available with spring-assisted counterweight for vertical or horizontal installation.
Technical Parameter Table
| Parameter | Value / Range |
|---|---|
| Nominal Diameter (DN) | 50 – 300 mm |
| Pressure Rating (PN) | 1.0 – 4.0 MPa |
| Body Material | Cast Steel (WCB, WCC, or LCB via request) |
| Disc Material | Cast Steel + Stainless Steel overlay (optional) |
| Seat Material | Stainless Steel / Reinforced PTFE |
| Counterweight Material | Ductile Iron / Steel (adjustable) |
| Connection Type | Flanged (RF, RTJ, or FF) |
| Operating Temperature | -29°C to +425°C |
| Applicable Media | Water, seawater, oil, gas, steam |
| Standards & Approvals | CCS, ISO9001, design per GB/T 13927 / API 6D |
Customer Benefits
- Reduced Water Hammer: The counterweight absorbs kinetic energy, preventing pressure surges that can damage piping.
- Longer Service Life: Smooth closure minimizes wear on seat and disc, reducing replacement frequency.
- Easy Installation & Maintenance: Flanged ends allow straightforward integration; the cartridge-style seat can be replaced without removing the valve from the line.
- Versatile Applications: Suitable for horizontal or vertical pipelines (with optional spring assist).
- Global Compliance: CCS Type Approval ensures acceptance by major ship classification societies and marine authorities.
- Cost-Effective: Competitive pricing without compromising on quality, backed by rigorous factory testing.
Every valve undergoes hydrostatic shell and seat leakage tests per ISO 5208. With our ISO9001 certified quality management system, we ensure consistent performance and traceability. As a manufacturer with an annual export value of US$1 million to US$1.5 million, we serve clients in more than 15 countries across North America, Europe, Southeast Asia, Africa, and the Middle East. Our products are shipped from major ports including Shanghai, Guangzhou, Hong Kong, and Beijing, with efficient logistics to meet your project deadlines.
Whether you are upgrading an existing marine system or building a new vessel, our Marine Check Valve with Counterweight delivers the reliability you need. We also offer customization options for materials, pressure classes, and end connections to match your exact specifications. Contact us today to request a quotation or technical datasheet. Our experienced engineers are ready to support your project from design to delivery.
Frequently Asked Questions (FAQ)
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Q: What is the advantage of a counterweight check valve over a standard swing check valve?
A: The counterweight provides additional closing force, allowing the valve to close faster and more smoothly, which reduces water hammer and disc slamming. This is especially beneficial in systems with frequent flow changes, such as ballast or cooling circuits. -
Q: Can this valve be installed vertically?
A: Yes, with an optional spring-assist mechanism, the valve can function in vertical pipes (flow direction upward). For horizontal installations, standard counterweight configuration works optimally. -
Q: Does the CCS Type Approval cover all sizes from DN50 to DN300?
A: Yes, the entire range DN50–DN300 is covered under our CCS type approval certificate. Each valve is marked accordingly, and we can provide a copy of the certificate upon request. -
Q: What is the maximum working temperature?
A: The standard design allows temperatures from -29°C to +425°C. For higher temperatures, special materials (e.g., alloy steel) can be used—please contact our sales team. -
Q: Is the counterweight adjustable?
A: Yes, the weight can be fine-tuned by adding or removing weight segments to match system requirements. This adjustment is typically done during commissioning. -
Q: What face-to-face dimensions do you follow?
A: We manufacture according to GB/T 12221 (equivalent to API 594 or BS 1868). Custom lengths are available upon request. -
Q: Do you provide spare parts such as seats, discs, or counterweights?
A: Absolutely. We keep a stock of common spare parts for quick delivery. For after-sales support, please provide the valve serial number for accurate matching. -
Q: What is the lead time for a standard order?
A: For DN50–DN200 sizes in PN16 or PN25, the typical lead time is 30–45 days. Larger sizes or special materials may require 50–60 days. We can expedite upon request.
For more detailed information, including dimensional drawings and installation instructions, please contact our sales team or visit our website. Shanghai Zhibang Valve Manufacture Co., Ltd. – your reliable partner for marine valve solutions since 2016.
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