The ball and valve seat of the metal hard-sealed
ball valve are completely metal-to-metal sealing. In order to
ensure the reliable sealing of the valve under various temperatures
and pressures, a variety of advanced ball and The hardening
technology of the valve seat includes supersonic spraying,
nickel-based spray welding, special surface hardening, cemented
carbide spray welding and the use of high-strength and
high-hardness ceramic materials.
The surface hardness of the ball and valve
seat can generally reach HRC60 or more, and the highest HRC74 and
above. The temperature resistance of the sealing surface material
can reach 540 ºC, and the maximum can reach 980 ºC.
The bonding strength of the material can
reach more than 10000PSI, and the sealing surface material also has
good abrasion resistance and impact resistance. Metal hard-sealed
ball valves are suitable for most harsh working conditions.