Y-Valve Disc Replacement

Fatigue failure in the disc material of high-pressure Y-Type plug valves is a significant concern, particularly in applications subjected to frequent cycles of pressurisation and depressurisation. These repetitive cycles induce stress variations within the material, gradually leading to the initiation and propagation of cracks. Over time, even small, initially harmless cracks can grow to critical sizes under the cyclical load, eventually causing the material to fail suddenly and often without prior deformation or obvious warning.

This failure mode is especially critical in systems where valves are operated regularly, as each cycle of opening and closing the valve contributes to the accumulation of stress and the potential for fatigue failure. Addressing fatigue failure requires careful selection of materials with high fatigue strength, precise engineering design to minimize stress concentrations, and regular maintenance practices to detect and mitigate the onset of cracking before catastrophic failure occurs.