Valves, Actuators & Pump Control

Ball valves with 100% shutoff

April 2003 Valves, Actuators & Pump Control

Valvtechnologies' metal-seated ball valves are designed to operate in high temperatures, under extreme pressures, in erosive environments. Their integral seat design improves performance over conventional replaceable seats. The downstream seat is integral, eliminating leakage, while the upstream seat guide is separate to allow for thermal expansion and smooth flow.

All sealing surfaces are coated with a hard chrome carbide alloy, and diamond lapped for a precision fit. The coating is applied by a RAM process, (Rocket Applied Metallics) by spraying the surface coating with a rocket engine at Mach 3 to form a 10 mm layer, many times harder than conventional coatings. This hardness, together with temperature ratings to 965°C, makes the valves resistant to catalysts, abrasives and corrosives fluids.

The tight shut-off characteristics and protected seat faces make the ball valves particularly suited for use in high pressure steam blowdown, drain and vent, coker furnace, catalyst slurry, high density polyethylene and high pressure ethylene applications. On all power generation applications the company offers a four-year guarantee on the equipment supplied. Valvtechnologies is represented locally by Mitech.

For more information contact Hennie Pretorius, Mitech, 011 462 2160,,


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