ASTM A217 C12 Swing Check Valves

Valve China description:
Name: Swing type check valve. 
Design: API 6D–full bore.
Body: ASTM A217 C12.
Nominal size: 18 Inch.
Nominal class: Class 600.
Connection ends: RF Flanged ends.
Face to face: as per ASME B16.10.
Test and inspection: API 598.