1. Various valve seat structures and various ball hardening treatment methods, suitable for different temperatures and media.
2. Anti-blowout valve stem;
3. Emergency valve stem seal;
4. Double block and bleed (DBB);
5. Valve body discharge;
6. Double piston effect valve seat (DB);
7. Low temperature, hydrogen, oxygen, vacuum occasion configuration;
8. Buried requirements;
9. Extended valve stem;
10. NACE anti-sulfur requirements.

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