Ceradyne manufactures balls for check valves for the oil exploration and recovery industry and other applications. These balls are produced to Grade 25V from Ceralloy® 147-31N Silicon Nitride and are used widely throughout the Permian Basin and other regions to extend the life of "sucker rod" pumps used in oil production. Silicon nitride is the material of choice because of its high strength, fracture toughness and wear / chemical erosion resistance. Consequently, silicon nitride balls for check valves are used in the most demanding oilfield applications.

Balls for check valves are available from stock in sizes ranging from 5/8 inch (15.8mm) to 2 1/4 inch (57.1mm) in increments of 1/16 inch (1.6mm). Removed "smaller sizes from 1/8 inch (3mm) are available upon request."