Causes of Low-Temperature Valve Leakage

2025-07-01

Causes of Low-Temperature Valve Leakage

There are two main causes: internal leakage and external leakage.

Internal leakage

The primary cause of internal valve leakage is deformation of the sealing assembly at low temperatures. When the medium's temperature drops to a point where the material undergoes a phase change, the resulting volume change can cause the previously precision-ground sealing surface to warp and deform, resulting in a poor seal at low temperatures.

External leakage

Valve leakage: One possible cause of leakage is when the valve and pipeline are connected using flanges. This occurs when the gaskets, bolts, and fittings contract asynchronously at low temperatures, leading to relaxation and leakage. Therefore, switching the valve body to the pipeline connection from flanges to welded connections can avoid low-temperature leakage. The second cause of leakage is leakage between the valve stem and packing.

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