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Nickel Aluminum Bronze (NAB) lug type dual disc check valves are widely used in marine, industrial, and water treatment applications due to their corrosion resistance, strength, and reliable performance. These valves help prevent backflow in piping systems, protecting pumps, compressors, and other critical equipment. Proper maintenance is essential to ensure long-term operation, reduce downtime, and prevent costly repairs.
Zhejiang Wandong Valve Co., Ltd. is a professional industrial valve manufacturer with vertically integrated production facilities. The company operates four specialized workshops, including ball valves, large-diameter gate valves, special stainless steel valves, and multifunctional workshops for gate valves, globe valves, check valves, and Y-strainers. Wandong Valve’s expertise ensures high-quality valves and comprehensive support for maintenance and operational efficiency.
1. Regular Inspection and Monitoring
Routine inspection helps detect early signs of wear or damage:
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Visual inspection: Check for external corrosion, leaks, or physical damage to the valve body and discs.
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Operational testing: Open and close the valve to ensure smooth movement without obstruction or sticking.
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Check sealing surfaces: Ensure disc and seat surfaces are clean and free from debris to maintain proper sealing.
Wandong Valve’s NAB dual disc check valves are designed for durability and easy inspection, making routine checks more effective.
2. Cleaning and Debris Removal
Foreign particles can affect valve performance and lead to premature wear:
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Flush the system regularly: Use clean water or compatible fluids to remove sediment from pipelines.
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Clean valve internals: Remove any debris from the disc, hinge, and seat areas using soft brushes or non-abrasive cloths.
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Avoid harsh chemicals: Do not use corrosive agents that could damage NAB material.
Proper cleaning ensures smooth operation and long-term reliability of the dual disc check valve.
3. Lubrication and Hinge Maintenance
The hinge mechanism is critical for the proper function of dual disc check valves:
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Check hinges and pins: Ensure they are free of corrosion and move smoothly.
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Apply suitable lubrication: Use compatible lubricants on moving parts without contaminating the pipeline medium.
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Inspect for wear: Replace worn pins or bushings promptly to avoid disc misalignment or jamming.
Wandong Valve’s valves are engineered for easy hinge access, supporting simple maintenance and reliable performance.
4. Check Sealing and Seat Integrity
Sealing performance is vital to prevent backflow:
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Inspect seat surfaces: Look for scratches, pitting, or erosion on discs and seats.
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Replace damaged seals: Use OEM replacement components to maintain optimal performance.
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Test tightness: Conduct pressure testing periodically to verify leak-free operation.
High-quality NAB material from Wandong ensures excellent corrosion resistance and long-lasting sealing properties, but regular monitoring is essential.
5. Preventive Maintenance Schedule
Adopting a preventive maintenance program reduces the risk of unexpected failures:
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Monthly visual inspections: Check for corrosion, leaks, and debris accumulation.
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Quarterly operational tests: Verify disc movement, seat contact, and hinge lubrication.
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Annual detailed maintenance: Disassemble the valve for internal cleaning, inspection, and replacement of worn parts.
Wandong Valve provides maintenance guidelines and technical support, ensuring valves are serviced according to best practices.
6. Proper Installation and Handling
Correct installation extends the service life of the valve:
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Follow manufacturer torque specifications for lug bolts and flange connections.
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Avoid pipeline stress: Ensure proper alignment to prevent valve distortion.
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Protect from impact: Handle the valve carefully during transportation and installation.
Zhejiang Wandong Valve emphasizes robust construction and precision engineering, but proper handling and installation are key to maximizing longevity.
7. Monitor Operating Conditions
Excessive pressure, temperature fluctuations, or corrosive media can reduce valve lifespan:
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Maintain operating parameters within design limits.
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Use corrosion inhibitors if recommended for specific applications.
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Install strainers or filters upstream to reduce particle ingress.
Wandong Valve’s NAB dual disc check valves are built to withstand demanding conditions, but monitoring ensures consistent, reliable performance.
Conclusion
Nickel Aluminum Bronze lug type dual disc check valves are critical for preventing backflow and protecting industrial systems. Routine inspection, cleaning, lubrication, sealing checks, preventive maintenance, proper installation, and monitoring operating conditions are essential to maximize valve lifespan and ensure operational reliability.
Zhejiang Wandong Valve Co., Ltd. provides high-quality NAB dual disc check valves with robust design and exceptional corrosion resistance. By following these maintenance tips and leveraging Wandong Valve’s technical guidance, operators can achieve long-term performance, reduced downtime, and cost-effective operation across marine and industrial applications.
www.wdfmvalves.com
Zhejiang Wandong Valve Co., Ltd.
