... field Tungsten carbide valve ball and seat:Specification:1.High strength, high wear resistance, high precision, high temperature resistant, corrosion resistant ... wells, viscous oil wells, sea oil wells and high pressure sulfur resistant oil wells, etc. 3. ... , button for tracers, ball grinder, bearing, valve ball etc. Tungsten Carbide valve ball and valve seatTypeF01F02F03F04F05F06F07F08D(mm)15.8819 ...