1. The assembled valve shall be purged with nitrogen for at least 1 minute.
2. The air tightness test must be carried out with pure nitrogen.
3. Encapsulation after qualified airtight test, sealing with clean polyethylene cap, soaking with organic solvent before using polyethylene cap, wiping clean.
4. Then sealed with vacuum bag.
5. Last packing.
6. Measures should be taken to ensure that the package is not damaged during transportation.