API V11 Valve Ball and Seat
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" |
