ISO 23632 Reveals Why Valve Designs Fail in the Field Despite Formal Approval

The article makes it clear that a large share of industrial valves fail in real-world operation because conventional design standards do not sufficiently demonstrate how a valve behaves across the full pressure/temperature envelope. Despite formal compliance, roughly sixty percent of the valves do not pass Design Validation Testing. When they are exposed to operating cycles, extreme temperatures and differential pressure, they still show seat leakage, excessive torque or mechanical damage. Especially in severe-service applications and new energy sectors such as hydrogen and cryogenic processes, this poses an immediate risk to safety, reliability and environmental performance, while these valves are often already in service on the basis of assumptions instead of proven behaviour. In practice, this failure becomes visible during cryogenic testing under representative operating conditions.

ISO 23632 positions itself as the necessary framework to structurally control this risk by mandating that design validation testing is linked to realistic mechanical and thermal cycles. The standard aligns technically with ISO 15848-1 and ISO 5208 and explicitly verifies seat leakage, operating torque and maximum stem torque within the declared design limits. With experts such as Colin Zegers and Luc Vernhes, both closely involved in the development and application of the standard, the article shows how ISO 23632 provides manufacturers, EPCs and asset owners with an objective basis for supplier qualification, life-cycle performance and demonstrable sustainability. Anyone wishing to understand why more and more end users include this standard in their specifications cannot ignore the full article.