Rotork actuators with profibus

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Courtesy of Rotork

Introduction

Rotork IQPro intelligent electric actuators with Profibus two-wire digital control provide an adaptable, reliable and economical solution for automated valve monitoring and control, as illustrated by examples in the UK water and sewage treatment industries.

Two recent projects undertaken by Wessex Water serve to illustrate the benefits of adopting Profibus-enabled Rotork actuators for automated valve control in new-build schemes and modernisation programmes in existing plants.

Maundown water treatment plant was originally built in the 1960s and first extended in the early 1970s. The site has recently been entirely redeveloped to further improve the quality of drinking water, upgrade the water treatment facilities and meet the increased demand for water from the 200,000 customers served in central Somerset.

More than 200 Rotork intelligent electric valve actuators have been installed throughout the £25 million project at Maundown. Under PLC control, Profibus-enabled Rotork IQ and IQT electric actuators operate penstocks and butterfly valves to control the flow of water and sequential backwashing operations throughout the new stateof- the-art treatment plant, comprising raw water screening, dissolved air flotation, rapid gravity filtration and granular activated carbon treatment followed by chlorine contact tanks. As well as increasing the treatment capacity to 82.4 MI/D, the improved treatment processes overcome taste and odour problems caused by increased algal blooms in the local water sources resulting from changing weather patterns.

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