What are the specific requirements for check valve core extraction?
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Experts, before conducting pressure testing on pipelines, it is necessary to remove the cores from check valves (lift-type and swing-type). But what are the specific requirements for this core removal process? For example, the specific steps for core extraction, whether torque is applied to the flange, and so on
You should ask the valve manufacturer for an installation manual.
There is an installation manual for the valves, but the manufacturer’s documentation isn’t detailed. The core extraction process is a simple step, but to include it in the instruction sheet, some specific requirements need to be defined
For some pressure testing, it’s not necessary to remove the components, but this is required when performing purging. Ask the manufacturer for the specifications and quantity of internal gaskets, and try to have them supplied together with the other components
From the perspective of the principle of check valves, if their actuating elements are springs or similar, it is necessary to remove the core; otherwise, the pressure applied will cause the springs to be under overload, which will affect their elasticity to some extent.