Failures in valves can be caused by many factors. Some of the more prominent causes include:
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Wear of the elastomers and/or seat seals over time
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Temperatures or pressures outside the designed operating parameters, especially unexpected pressure spikes in the pipeline
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Foreign or abrasive debris in the pipeline
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Material incompatibility with the product being processes
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Incorrect assembly, installation, or maintenance procedures performed on valve
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Water or foreign debris in plant airline may cause pneumatic actuator failure
Author - Chris Sinutko