Metal Seated Ball Valve

Metal Seated Ball Valve

The seat of metal seated ball valve is coated and lapped to match ball, creating a positive seal. Coating options: Chrome Carbide, Tungsten Carbide, WC, Stellite etc. Metal Seated Ball Valves are ideal for the refining, power generation, and oil and gas industries.

Metal-seated valves that provide superior operation at high temperatures as well as providing abrasion resistance in demanding applications.

The leakage rate for metal seated ball valves within API STD 598 is similar to ANSI/FCI 70-2. API 598 requires zero bubbles per minute seat leakage for resilient seated isolation valves.

Design and Manufacture Standard.

Basic Design API 6D
Wall Thickness API 6D
Face-to-Face Dimension API 6D
Flange End Dimension ANSI/ASME B16.5 (1” to 24”)
ANSI/ASME B16.47 (26” & up)
Butt-Weld End Dimension ANSI/ASME B16.25
Inspection & Testing API 6D/API 598
Fire Safe Design API 607/BS 6755
               

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.