Our valve balls and valve seats strictly comply with API 11 AX standard.
API Standard Materials
API Symbol |
Description |
Hardness |
Material |
A1 |
Stainless Steel |
Ball HRC 58-65Seat HRC 52-56 |
440C |
B1 |
Cobalt Alloy Cast |
Ball HRC 55-63Seat HRC 50-56 |
Cobalt, chromium and tungsten alloy |
B2 |
Cobalt Alloy Powder Metal |
Ball HRC 53-60Seat HRC 51-57 |
Cobalt, chromium, and tungsten alloy |
C1 |
Tungsten Carbide |
Ball HRA 88-89Seat HRA 88-89.5 |
Tungsten with cobalt binder |
C2 |
Nickel Carbide |
Ball HRA 89-90.5 Seat HRA 87.5-89 |
Tungsten with nickel binder |
C3 |
Titanium Carbide |
Ball HRA 89-90.5 |
Tungsten and titanium Carbide with cobalt binder |