Contact Platform Support
Help CenterZero Leakage Diaphragm Check Valve for Marine Cooling Water, EPDM, PN1.6MPa, DN20
Product Spotlights
Related Products
-
Cast Iron Marine Diaphragm Check Valve, Zero Leakage, DN15-DN50, PN1.0-1.6MPa Threaded ConnectionNegotiableMOQ: 1 Unit -
Marine Diaphragm Check Valve With 1-Year Warranty, Mill Test Report, Cast Iron, EPDMNegotiableMOQ: 1 Unit
-
Standard Compliant Marine Diaphragm Check Valve, DNV BV, Zero Leakage, Threaded ConnectionNegotiableMOQ: 1 Unit
-
Marine Diaphragm Check Valve, Cast Iron, EPDM, Zero Leakage, DN15-DN50, PN1.0MPaNegotiableMOQ: 1 Unit
-
316L Marine Silent Check Valve, Threaded Connection, 150LB, Dual Spring Closure, Anti-Slam DesignNegotiableMOQ: 1 Unit
Shanghai Zhibang Valve Manufacture Co., Ltd, an ISO9001-certified manufacturer established in 2016, presents our Zero Leakage Diaphragm Check Valve specially engineered for marine cooling water applications. With an annual export value of US$1–1.5 million and a global footprint across North America, Europe, Southeast Asia, and beyond, we combine precision manufacturing with rigorous quality control. This valve ensures absolute bubble-tight shutoff, protecting your cooling system from backflow and contamination even under demanding marine conditions.
Built with a high-grade EPDM diaphragm and rated at PN1.6MPa with a DN20 size, this valve is specifically designed for seawater, freshwater, and other cooling media commonly used in ships and offshore platforms. The zero-leakage design eliminates the risk of cross-flow, reduces maintenance downtime, and extends the life of pumps and heat exchangers. Let us explore the technical details and advantages.
Key Features & Technical Specifications
- Zero Leakage Performance: The diaphragm design provides a positive, bubble-tight seal that prevents any backflow, meeting the strictest leakage class (ANSI Class VI equivalent). Ideal for systems where even a tiny leak can cause corrosion or contamination.
- EPDM Diaphragm: Excellent resistance to seawater, ozone, and aging. Suitable for temperatures from -10°C to +80°C. EPDM is low-cost and widely accepted in marine cooling loops.
- Pressure Rating PN1.6MPa: Suitable for typical marine cooling water circuits with operating pressures up to 16 bar. The valve body is constructed from ductile iron or bronze (optional), coated with marine-grade epoxy for corrosion resistance.
- Compact Design (DN20): The 3/4-inch (DN20) size is perfect for branch lines, bypass circuits, or small cooling loops. Its short face-to-face dimension saves installation space.
- No Metal-to-Metal Contact: The diaphragm isolates the flow medium from the valve body, reducing wear and ensuring smooth operation even with particulates.
- Low Pressure Drop: Optimized flow path minimizes head loss, improving energy efficiency of the cooling system.
| Parameter | Specification |
| Nominal Diameter | DN20 (3/4") |
| Nominal Pressure | PN1.6MPa (16 bar) |
| Body Material | Ductile Iron / Bronze (optional) |
| Diaphragm Material | EPDM (FDA-grade available) |
| Connection Type | Flanged (PN16) or Threaded BSP/NPT |
| Working Temperature Range | -10°C to +80°C |
| Leakage Rate | Zero (bubble-tight) |
| Coating | Marine-grade epoxy (optional) |
| Standard Compliance | Manufactured under ISO9001 quality system |
Why Choose This Valve for Your Marine Cooling System?
- Enhanced System Reliability: Zero leakage prevents backflow that could introduce air bubbles or contaminants into delicate heat exchangers, reducing the risk of cavitation and corrosion.
- Reduced Maintenance Costs: The EPDM diaphragm is highly durable and resistant to fouling. No packing or gland adjustments are needed, saving labor and spare parts.
- Energy Efficient: The streamlined flow path minimizes pressure drop, lowering pump energy consumption over time.
- Easy Installation: Lightweight and compact, the valve can be installed in any orientation without special supports. Available with flanged or threaded ends to fit existing piping.
- Corrosion Protection: Optional marine-grade epoxy coating and bronze body provide excellent resistance to saltwater corrosion, ensuring long service life even in aggressive marine environments.
Trusted by Global Marine Clients
Shanghai Zhibang Valve has been delivering high-quality valves since 2016, with annual exports exceeding US$1 million. Our products are shipped to major ports worldwide including Shanghai, Guangzhou, Hong Kong, and Beijing. We serve clients across North America, South America, Europe, Southeast Asia, Africa, Oceania, the Middle East, and Asia. Our ISO9001 management system ensures consistent quality from raw material procurement to final testing. Each valve is hydrostatically tested at 1.5 times the rated pressure, and 100% of diaphragm check valves undergo a bubble-tight leakage test before shipment.
By choosing our zero leakage diaphragm check valve, you are not just buying a product—you are investing in reliable performance backed by a manufacturer with a proven track record. We offer customization (e.g., special connection threads, different diaphragm materials like NBR or Viton) upon request. Contact us today for a quote or technical datasheet. Let us help you optimize your marine cooling water system.
Frequently Asked Questions (FAQ)
-
Q: What does "zero leakage" mean for a check valve?
A: Zero leakage means the valve provides a bubble-tight seal when closed, meaning no backflow or seepage occurs. This is achieved by the diaphragm pressing tightly against the seat, preventing any cross-flow even under low differential pressure. -
Q: Is this valve suitable for seawater?
A: Yes. The EPDM diaphragm and optional bronze body offer excellent resistance to seawater corrosion. For heavily chlorinated or brackish water, we recommend confirming compatibility or requesting alternative materials (e.g., NBR or Viton). -
Q: What pipe connections are available for DN20?
A: We offer flanged (face-to-face per EN 558) and threaded (BSP or NPT) options. You can specify your preference when ordering. -
Q: Can this valve be used in horizontal and vertical installations?
A: Yes, the diaphragm check valve can be installed in any orientation without affecting its sealing performance. However, for optimal flow, avoid mounting it with the diaphragm facing downward in vertical pipes with high sediment. -
Q: What is the maximum operating temperature for EPDM?
A: The standard EPDM diaphragm can continuously handle temperatures from -10°C to +80°C. For higher temperatures (up to 130°C), we can supply a special EPDM compound or alternate elastomer (please inquire). -
Q: How often should the diaphragm be replaced?
A: Under normal marine cooling water conditions, the diaphragm can last 3–5 years. Regular inspection during maintenance intervals is recommended. We offer spare diaphragm kits for easy field replacement. -
Q: Do you provide any certification or test reports?
A: Yes. As an ISO9001 certified manufacturer, we can provide Material Certificates (EN 10204 3.1), hydrostatic test reports, and leakage test reports upon request. -
Q: What is the minimum order quantity (MOQ)?
A: For standard DN20 EPDM check valves, our MOQ is 10 pieces. For custom sizes or materials, MOQ may be higher. Please contact our sales team for details.
Send Inquiry to This Supplier
You May Also Like
-
304 Stainless Steel Marine Silent Check Valve, DN50-DN200, PN1.6MPa, Wafer Spring Loaded, No Water HammerNegotiableMOQ: 1 Unit
-
Cast Steel Marine Silent Check Valve, Flanged End, DN100-DN300, PN2.5MPa, Silent Closing for Ship PipesNegotiableMOQ: 1 Unit
-
Carbon Steel Marine Silent Check Valve, PN4.0MPa, DN80-DN250, Lug Style, Spring Assisted, Non-ReturnNegotiableMOQ: 1 Unit
-
Ductile Iron Marine Silent Check Valve, Wafer Type, DN40-DN150, PN1.0MPa, Soft Seal, Low Pressure DropNegotiableMOQ: 1 Unit
-
Marine Silent Check Valve With 18-Month Warranty, Factory Mill Test Report, DN50-DN300, PN10-PN40NegotiableMOQ: 1 Unit
-
Marine Silent Check Valve for Shipboard Freshwater Systems, 304 SS, DN65, PN16, Anti-SurgeNegotiableMOQ: 1 Unit
-
Bronze Marine Silent Check Valve, 1-4 Inch, 300LB, Threaded Ends, Compact Body, Silent OperationNegotiableMOQ: 1 Unit
-
Silent Check Valve for Ballast Water Treatment, 316L, DN200, Flanged, Resilient Seal, IMO CompliantNegotiableMOQ: 1 Unit
-
Zero Leakage Marine Diaphragm Check Valve, Cast Iron Body, EPDM, DN15-DN50, PN1.0MPaNegotiableMOQ: 1 Unit
-
Standard Compliant Marine Silent Check Valve, Free Replacement for Defects, Cast Body, Wafer ConnectionNegotiableMOQ: 1 Unit
