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Valve balls and valve seats are widely used in oil fields , their performance directly affects the use effect and service life of the pumps.
Each ball-and-seat combination is vacuum tested to ensure a perfect seal is obtained in all positions of contact.
API Material Symbol
Symbol |
Symbol |
Hardness |
Material |
A1 |
Stainless Steel |
Ball: HRC 58-65 Seat: HRC 52-56 |
UNS 41000–UNS 44000 |
B1 |
Cobalt Alloy, Cast |
Ball: HRC 56-63 Seat: HRC 50-56 |
Cobalt, chromium, and tungsten alloy |
B2 |
Cobalt Alloy, Powder Metal |
Ball: HRC 53-60 Seat: HRC 51-57 |
Cobalt, chromium, and tungsten alloy |
C1 |
Tungsten Carbide |
Ball: HRA 88-89 Seat: HRA 88-89.5 |
Tungsten with Cobalt binder |
C3 |
Titanium Carbide |
Ball: HRA 89-90.5 Seat: HRA 89-90.5 |
Tungsten and titanium carbide with cobalt binder |
API Ball and Seat Size
API No. |
Seat Size |
Ball Size |
V11-106 |
1-1/16" |
5/8" |
V11-125 |
1-1/4" |
3/4" |
V11-150 |
1-1/2" |
15/16" |
V11-175 |
1-3/4" |
1-1/8" |
V11-200 |
2" |
1-1/4" |
V11-225 |
2-1/4" |
1-3/8" |
V11-250 |
2-3/4" |
1-1/16" |
V11-375 |
3-3/4" |
2-1/4" |
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