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Help CenterDuctile Iron Marine Silent Check Valve, Wafer Type, DN40-DN150, PN1.0MPa, Soft Seal, Low Pressure Drop
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Shanghai Zhibang Valve Manufacture Co., Ltd has been a leading manufacturer of high-performance valve solutions since 2016. Our Ductile Iron Marine Silent Check Valve (Wafer Type) is engineered to deliver reliable backflow prevention with minimal noise and pressure loss, making it ideal for marine, water, and industrial systems. Designed with a soft seal and a low-pressure-drop profile, this valve ensures longevity and efficiency even under demanding conditions.
Crafted from premium ductile iron (GGG40/50), the valve body offers exceptional strength and corrosion resistance. The wafer-type design allows for easy installation between flanges, saving space and reducing overall system weight. The silent operation is achieved through a guided disc with a spring-assisted closing mechanism, eliminating water hammer and maintaining system stability.
Available in sizes DN40 to DN150 with a working pressure of PN1.0MPa (10 bar / 145 psi), this check valve is suitable for a wide range of applications including marine engineering, wastewater treatment, HVAC, and general industrial pipelines. The soft seal – available in EPDM or NBR – provides a tight shut-off and excellent resistance to wear and chemicals.
Key Features & Technical Specifications
- Silent Operation: Spring-assisted disc closes gently to prevent pressure surge and noise – ideal for noise-sensitive environments.
- Low Pressure Drop: Streamlined flow path and lightweight disc reduce head loss, improving system efficiency.
- Soft Seal Design: Elastomeric seat ensures bubble-tight shut-off at low and high pressures (up to 1.0 MPa).
- Corrosion Resistance: Ductile iron body with epoxy coating (optional) suitable for fresh water, seawater, and many industrial fluids.
- Compact Wafer Style: Short face-to-face dimensions per EN 558, easy to retrofit in existing pipework.
- Easy Maintenance: Simple design with few moving parts reduces downtime and replacement costs.
- ISO 9001 Certified: Manufactured under strict quality control to ensure consistent performance.
| Parameter | Value |
|---|---|
| Material | Ductile Iron (ASTM A536 / EN-GJS-400-15) |
| Size Range | DN40 – DN150 |
| Pressure Rating | PN1.0MPa (10 bar) |
| Seal Material | EPDM / NBR (Soft Seal) |
| Disc Material | Ductile Iron with Rubber Coating |
| Spring Material | Stainless Steel 304 |
| Connection | Wafer Type (Between Flanges per ISO 7005) |
| Operating Temperature | -10°C to +80°C (EPDM), -20°C to +70°C (NBR) |
| Applicable Fluid | Water, Seawater, Oil, Air (non-aggressive) |
The low pressure drop characteristic of this check valve is achieved by optimizing the flow area and minimizing turbulence. In independent tests, the pressure loss across a DN100 valve at 2 m/s flow velocity is less than 0.3 bar, which translates into significant energy savings in long-term operations. Moreover, the spring-assisted disc closes rapidly when flow reverses, ensuring that backflow is stopped before any damage or contamination occurs.
Trusted by Global Customers
Shanghai Zhibang Valve Manufacture Co., Ltd has been a reliable partner for marine and industrial projects worldwide since 2016. With an annual export value of US$1 – US$1.5 million, we ship to major ports including Shanghai, Guangzhou, Hong Kong, and Beijing. Our products are trusted in North America, South America, Europe, Southeast Asia, Africa, Oceania, the Middle East and other regions. We hold ISO9001 quality management certification, ensuring each valve meets rigorous international standards.
All our valves undergo strict factory testing including shell pressure tests, seat leakage tests, and functional checks before shipment. We offer customizable options such as different seal materials, flange drilling (ANSI/DIN/GB), and special coatings upon request.
Contact us today for a competitive quotation and expert technical support. Our team is ready to assist you in selecting the right check valve for your marine or industrial application.
Frequently Asked Questions (FAQ)
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Q: What is the main advantage of a silent check valve over a standard swing check valve?
A: The silent check valve uses a spring-assisted disc that closes quickly and quietly, preventing water hammer and pressure surges. It produces minimal noise and reduces stress on the pipeline, making it ideal for marine and civil applications where quiet operation is required. -
Q: Can this valve be used in vertical pipelines?
A: Yes, the wafer type silent check valve can be installed in both horizontal and vertical lines (upward flow). For vertical installations with downward flow, please consult our technical support for spring selection. -
Q: What seal materials are available and which is recommended for seawater?
A: We offer EPDM (excellent for hot water, steam, and many chemicals) and NBR (good for oil and fuel). For seawater applications, EPDM is the preferred choice due to its superior resistance to saltwater and ozone. -
Q: What are the face-to-face dimensions? Do they conform to any standard?
A: The wafer dimensions comply with EN 558 series 49 (short pattern). Detailed dimensional drawings are available upon request. -
Q: Is the valve suitable for high-temperature fluids above 80°C?
A: The standard soft seal material (EPDM) is rated up to 80°C. For higher temperatures, we can offer optional Viton seals (up to 200°C) – please inquire for custom solutions. -
Q: Do you provide samples for testing? What is the lead time?
A: Yes, we can provide samples (freight collect) for evaluation. Standard production lead time is 15-25 working days depending on quantity and customization. -
Q: Is the valve certified for marine use?
A: Our valve is manufactured under ISO9001 quality system. For specific marine classification society approvals (e.g., DNV, ABS, CCS), they are available upon request with additional documentation and testing. -
Q: What is the minimum order quantity (MOQ)?
A: The standard MOQ is 10 pieces per size, but small trial orders (1-5 pieces) are accepted for market testing.
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