Zero leakage, low operating torques, metal seat hard face coatings in Stellite, tungsten carbide or chrome carbide.
Coating of Metal Seats
Often to prolong their life and especially in connection with severe service applications, Metal Ball valves will undergo a metal finishing process to further insulate the base metal from its environment and prevent corrosion and wear.
Tungsten Carbide – For more severe environments where severe flashing or hydraulic shock is expected, a harder coating will be required. If temperatures are below 150 Degrees Celsius then most often HVOF applied Tungsten Carbide coating will add a high level of corrosion and wear resistance whilst also offering low porosity.
Chrome Carbide – For temperatures up to 815 Degrees Celsius then Chrome Carbide or Cobalt- Chromium alloys should be considered as these will achieve a hardness of 70+ HRC and will provide excellent corrosion resistance.