... design available 3.Used in valve field Tungsten carbide valve ball and seat:Specification:1.High strength, high wear resistance, high ... , tips for ballpens, button for tracers, ball grinder, bearing, valve ball etc. Tungsten Carbide valve ball and valve seatTypeF01F02F03F04F05F06F07F08D(mm)15.8819.0523 ... .3229.6735.2637.5443.6951.0578.03d±1.27(mm)11.6813.9717.0220.9624.3826.9233.2743.18