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Help CenterCast Steel Marine Check Valve With Counterweight, DN50-DN300, PN1.0-4.0MPa, Slow Closing, CCS Certified
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Shanghai Zhibang Valve Manufacture Co., Ltd. is a professional manufacturer established in 2016, dedicated to providing high-quality industrial valves for marine and offshore applications. Our Cast Steel Marine Check Valve with Counterweight is designed to deliver reliable non-return protection in piping systems, combining robust cast steel construction with a slow-closing mechanism to prevent water hammer and ensure system safety. With sizes ranging from DN50 to DN300 and pressure ratings from PN1.0 to PN4.0MPa, this check valve is built to meet the demanding requirements of shipbuilding and marine engineering. Every valve is CCS certified, reflecting our commitment to quality and compliance with international maritime standards.
This product is especially suited for heavy-duty applications where backflow prevention and operational stability are critical. The counterweight design allows for adjustable closing speed, while the slow-closing feature minimizes pressure surges. Our factory in Shanghai implements strict quality control under ISO9001 management system, ensuring consistent performance across all units.
Key Features & Technical Advantages
- Cast Steel Body: High-strength cast steel (WCB, WCC or optional stainless steel) provides excellent corrosion resistance and durability in seawater and oil environments.
- Counterweight-Assisted Slow Closing: Adjustable counterweight ensures gentle, gradual closure without slam, protecting downstream equipment and reducing noise.
- Wide Pressure Range: Suitable for PN1.0, PN1.6, PN2.5 and PN4.0MPa, compatible with various marine piping systems.
- Compact Design: Short face-to-face dimensions (wafer or flanged style) save installation space.
- Low Maintenance: Self-lubricating bearings and corrosion-resistant bushings reduce wear and extend service life.
- Full Bore: Full diameter flow passage minimizes pressure drop.
- CCS Certificate: Each valve is supplied with China Classification Society approval, ensuring compliance with international shipbuilding rules.
Technical Specifications
| Size Range | DN50 – DN300 (2" – 12") |
| Pressure Rating | PN1.0 – PN4.0MPa (150 – 300 Class optional) |
| Body Material | Cast Steel (WCB, WCC, LCB, CF8, etc.) |
| Disc Material | Stainless Steel (SS304, SS316) |
| Seat Seal | Metal-to-Metal or Soft Seal (PTFE, NBR, optional) |
| End Connection | Flanged (ASME B16.5, EN 1092, JIS, or custom) |
| Closing Mechanism | External Counterweight + Slow Closing |
| Certification | CCS, ISO9001 (company system) |
Operational Benefits for Your System
- Water Hammer Prevention: The slow-closing counterweight design reduces impact forces by up to 80% compared to conventional swing check valves, extending pipeline life.
- Reliable Backflow Protection: Positive sealing ensures zero leakage at rated pressure, maintaining system integrity.
- Easy Installation & Adjustment: Counterweight can be adjusted on-site without tools, allowing fine-tuning of closing speed according to flow conditions.
- Global Compatibility: Available with multiple flange standards (ANSI, DIN, JIS) to suit international projects.
- Corrosion Resistance: Suitable for seawater, fresh water, oily water, and various chemicals based on material selection.
Why Choose Shanghai Zhibang Valve?
With an annual export value of US$1 Million – US$1.5 Million, we have established a strong presence in over 10 international markets including North America, Europe, Southeast Asia, and Africa. Our ISO9001-certified factory in Shanghai ensures every valve is manufactured under strict quality control procedures. We have supplied marine check valves to shipyards, offshore platforms, and marine engineering companies worldwide. Each valve undergoes hydrostatic testing and functional inspection before shipment. Our team provides professional technical support and after-sales service.
We are confident that our Cast Steel Marine Check Valve with Counterweight will meet your most demanding requirements. Contact us today for a quote or technical consultation. We offer flexible shipping options from Shanghai, Guangzhou, Hong Kong, and Beijing ports.
Frequently Asked Questions
Q1: What is the difference between a standard swing check valve and this slow-closing counterweight version?
A1: The counterweight and slow-closing mechanism allow the valve to close gradually, significantly reducing water hammer and pressure surges. It is ideal for systems with pumps or long pipelines where sudden closure can cause damage.
Q2: Can the counterweight be adjusted after installation?
A2: Yes, the external counterweight can be easily adjusted by adding or removing weights to achieve the desired closing speed. No special tools are required.
Q3: What materials are available for the valve body and trim?
A3: Standard body is cast steel WCB. Optional materials include stainless steel CF8/CF8M, LCB, and duplex stainless steel. Disc and seat materials can be customized based on media type.
Q4: Is the valve suitable for horizontal or vertical installation?
A4: This check valve is primarily designed for horizontal piping with the disc swinging upward. Vertical installation with upward flow is also possible, but consult our engineers for proper sizing.
Q5: How is the CCS certification provided?
A5: Each valve is manufactured under the supervision of China Classification Society and comes with a CCS type approval certificate. We also provide individual unit certificates upon request.
Q6: What is the lead time for a typical order?
A6: Standard sizes (DN50-DN200) usually ship within 15-25 working days. Larger sizes or special materials may require 30-40 working days. Contact us for current lead times.
Q7: Do you provide custom flange drilling or special end connections?
A7: Yes, we can manufacture flanges according to ASME, DIN, JIS, or other standards. Custom drilling patterns are available upon request.
Q8: What warranty do you offer?
A8: We provide a standard 12-month warranty from the date of shipment against manufacturing defects. Extended warranty options are negotiable.
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