Valves, Actuators & Pump Control

Ball valve endures the test

April 2003 Valves, Actuators & Pump Control

The standard metal-seated manual ball valve from Valvtechnologies is supplied with a four-year warranty when used for high-pressure water and steam isolation duties in power stations. This is of particular significance when it is known that the existing valve that it replaces often requires maintenance within a period of only two weeks up to one year.

The manual Ball Valve's integral seat design improves performance over conventional replaceable seats and its sealing surfaces, made from hard chrome carbide alloy, are diamond lapped for a precision fit.

Its ceramic coating and special construction provide good corrosion resistance and allows the valve to be used in temperatures up to 1000°C. Easy to actuate with a 1/4 turn action, the valve features butt weld ends, F22 chrome molly or A105 carbon steel, #2 500 and is available in sizes from 20 to 65 mm.

Manufactured to ISO 9001 requirements, the valve has a bubble-tight shut-off to ANSI FCI 70-2 which is achieved with an integral downstream seat which is completely protected from the flow path. The major advantage of the ball valve in high pressure water and steam isolation applications is its lever operation which makes the valve easy to operate as well as giving highly visible valve position indication. Both globe and gate valves often fail if they are left in a partially open position.

A variety of Valvtechnologies' pneumatic double-acting and spring return actuators, electric motors or hydraulic actuators, in addition to gear operators are available. Various options include bi-directional sealing, control trims, special end connections and hard coatings, various materials of construction, sizes up to 400 mm and pressure classes to ANSI 4 500.

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


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