Causes of endoleak:
1. The closure is not strict;
2. Joint surface damage;
3. The gap between the valve core and the valve stem is too large, causing the valve core to sag or have poor contact;
4. The sealing material is bad or the valve core is stuck.
How to handle:
1. Improve operation, reopen or close;
2. The valve is disassembled, and the valve core and valve seat sealing surface are reground;
3. Adjust the gap between the valve core and the valve stem or replace the valve disc;
4. The valve disintegrates to eliminate jamming;
5. Re-replace or overlay the sealing ring
