Sappi awards V&A order for valve automation packages on 11 digester

Valve & Automation have been awarded the order for NAF manual, on/off and control valves for the 11 x new digesters that Sappi are installing. Equipment includes NAF on/off Duball ball valves in special alloys, Richter lined valves for chemical handling and Stafsjö knife gate valves. In excess of 400 pieces up to DN900 have been ordered for the project so far.

The NAF-Linkit valve position controllers with Profibus communication were been selected for their ability to communicate with the ABB control system. The NAF valve package has a modular design concept enabling each component (Valve / actuator / position) to be directly mounted without the need for special brackets.

The project includes a new set of 11 magnesium cooking digesters and associated chip loading, new evaporator plants, a new magnesium oxide and sulphur dioxide recovery plant and boiler. A new turbine/generator set to match the new recovery boiler. A new bleach plant and pulp machine, an upgrade to the existing chlorine dioxide plant is also planned.

NAF-Duball can be used both as a control valve and as a shut-off valve, in a wide variety of applications and in different operating modes. The valve represents a concrete result of our product philosophy which is focused on functionality, high quality and low life cycle costs, and is based on concentrating our range to a limited number of valve types, but all of them suitable for a wide variety of applications. The excellent characteristics of NAF-Duball are particularly beneficial under the most arduous operating conditions in the process industry, where difficult media and demanding pressure conditions make severe demands on the design, materials and performance.

For information on how V&A can assist with your manual, on/off and control applications, please contact greg.woolfuth@valve.co.za