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