Typical circumstances requiring absolute shutoff include:
• Protection of the health and safety of personnel
• Avoidance of product contamination
• Control of products flowing through manifolds or common pipelines
It is well recognized that many conventional types of valves may develop leaks. Causes of leaks include age, misuse, erosion and distortion. These valves cannot be guaranteed to provide absolute shutoff in the line. Therefore, it is necessary to close off or blind the pipeline by other means.
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