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In industrial systems, Class 900 bolted bonnet swing check valves play a critical role in preventing backflow, protecting pumps, compressors, and piping networks. These valves are widely used in power plants, chemical processing, water treatment, and other heavy-duty industrial applications. Proper maintenance is essential to ensure long-term reliability, minimize downtime, and maintain optimal performance. Zhejiang Wandong Valve Co., Ltd., a vertically integrated industrial valve manufacturer, produces a wide range of valves, including ball valves, large-diameter gate valves, stainless steel specialty valves, and multifunctional valves such as swing check valves, stop valves, and Y-type strainers. Their expertise ensures that maintenance practices align with high-quality manufacturing standards.

1. Regular Inspection and Cleaning

Routine inspection is the first step in maintaining swing check valves:

• Visual inspection: Check for corrosion, leakage, or visible wear on the valve body, bonnet, and sealing surfaces.

• Internal inspection: Disassemble the bolted bonnet periodically to inspect the hinge mechanism, disc, and seat. Remove any deposits, rust, or debris that could impede movement.

• Flow path cleaning: Ensure that the pipeline upstream and downstream of the valve is free of contaminants, which could interfere with proper closure.

Zhejiang Wandong Valve Co., Ltd. designs their swing check valves with durable materials and precise machining, facilitating easier inspection and cleaning while ensuring reliable operation in demanding industrial environments.

2. Lubrication and Hinge Maintenance

The hinge pin and disc assembly are critical components of a swing check valve:

• Lubricate hinge points periodically to reduce wear and prevent sticking.

• Check for smooth operation: Ensure the disc swings freely without obstruction or excessive friction.

• Replace worn parts: Hinge pins, bushings, or discs showing significant wear should be replaced promptly.

Wandong’s swing check valves are engineered for long-lasting performance, and proper hinge maintenance ensures that valves continue to function as designed under Class 900 pressure conditions.

3. Sealing Surface Inspection

The sealing surfaces of the valve disc and seat are crucial for preventing backflow:

• Inspect for erosion or pitting: High-velocity flow or corrosive media can damage sealing surfaces over time.

• Clean gently: Use appropriate cleaning agents to avoid scratching or damaging precision surfaces.

• Re-lap or replace as necessary: Worn surfaces can often be refurbished, but severely damaged components should be replaced.

Zhejiang Wandong Valve Co., Ltd. manufactures swing check valves to stringent ANSI and API standards, ensuring high-quality sealing surfaces that withstand wear and corrosion while maintaining reliable performance.

4. Bolt and Gasket Maintenance

Bolted bonnet valves rely on proper gasket sealing and bolt tension to prevent leakage:

• Check bolt tightness: Periodically inspect and retorque bolts according to manufacturer specifications.

• Inspect gaskets: Replace worn or compressed gaskets to maintain a leak-free seal.

• Avoid over-tightening: Excessive torque can damage the bonnet or gasket, compromising valve performance.

Wandong’s vertically integrated production, including specialized workshops for gate valves, ball valves, and multifunctional valves, ensures that their bolted bonnets are designed for durable sealing and ease of maintenance.

5. Functional Testing

Periodic functional testing ensures that the valve operates correctly under system conditions:

• Simulate flow conditions: Open and close the valve under controlled pressure to observe disc movement and sealing.

• Check for backflow: Ensure the valve closes completely and prevents reverse flow.

• Monitor for unusual noise or vibration: Unusual sounds may indicate hinge wear, debris, or misalignment.

By using high-quality valves from Zhejiang Wandong Valve Co., Ltd., industrial operators benefit from precise valve engineering that supports reliable functional performance and easy testing procedures.

6. Record Keeping and Maintenance Schedule

Maintaining detailed records helps prevent failures and prolong valve life:

• Log inspections and maintenance activities including dates, observations, and corrective actions.

• Follow a preventive maintenance schedule based on operating conditions, fluid type, and pressure class.

• Track replacements: Documenting replaced parts helps predict future maintenance needs and budget effectively.

Wandong valves are widely used in demanding industrial environments globally, and their robust construction supports structured preventive maintenance programs.

Conclusion

Class 900 bolted bonnet swing check valves are critical to maintaining safe and efficient industrial operations. Proper maintenance, including regular inspection, hinge lubrication, sealing surface care, bolt and gasket checks, functional testing, and record keeping, ensures reliability and longevity.

By choosing high-quality valves from Zhejiang Wandong Valve Co., Ltd., operators can leverage durable materials, precision manufacturing, and industry-standard design to minimize downtime and maximize system performance. Regular maintenance not only protects equipment but also enhances operational efficiency, safety, and long-term cost savings in industrial applications.

http://www.wdfmvalves.com
Zhejiang Wandong Valve Co., Ltd.

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