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How to check the cause of coaxial valve failure

Apr 16,2024

Coaxial valves play a crucial role in industrial equipment and fluid control systems; however, they occasionally malfunction. Understanding how to inspect and determine the causes of coaxial valve failures is critical for quickly restoring equipment operation and preventing similar future problems.

1. Basic Working Principles of Coaxial Valves

Coaxial valves, also known as concentric valves, are a special type of valve designed to allow fluid to pass through without a change in direction. Understanding their working principles helps identify potential problems.

2. Common Malfunction Symptoms
Fluid Leaks
Valve operation is inflexible or stuck
Valve cannot be fully closed or opened
Unusual noise or vibration
3. Troubleshooting Steps
3.1 Visual Inspection
Check the valve and connecting pipes for any obvious damage or corrosion.
Check for any foreign objects obstructing the valve or affecting its normal operation.
3.2 Operational Check
Try manually operating the valve to check for smooth operation and any sticking.
If there is an electric or pneumatic actuator, check if it is working properly.
3.3 Leak Detection
Use soapy water or leak detection fluid to check for leaks in the valve and connections.
Pay attention to the integrity of the packing gland and stem seal.
3.4 Internal Inspection
Disassemble the valve and check the inside for debris, scaling, or corrosion.
Check the valve seat and valve disc for wear or damage.
3.5 Instrument and Control System Inspection
If the valve is equipped with instruments or a control system, check if it is working properly.
Check sensors, actuators, and controllers for malfunctions or errors.
4. Preventive Measures
Regular maintenance and inspection to ensure the valve is in good condition.
Use high-quality fluids and lubricants to reduce corrosion and wear.
Follow the manufacturer's guidelines and recommendations when installing and replacing valves.
5. Conclusion

Inspecting and determining the cause of coaxial valve failure requires careful observation and systematic inspection steps. By combining visual inspection, operational checks, leak detection, and internal and control system checks, problems can be effectively identified and resolved. Preventive measures can significantly reduce the occurrence of future failures.