Rotork IQT intelligent electric actuators for quarter-turn valves are a central feature of a filter improvement project at the Severn Trent Ogston water treatment plant in Derbyshire, UK. Norwest Holst Construction Ltd has carried out the complete upgrade of twelve rapid gravity filters at Ogston, including the fitting of Tetra block filtration flooring, replacing the old sand and gravel media with an improved sand and anthracite formula and installing a new clean backwash water main. The project also involved fitting new butterfly and plug valves with Rotork IQT actuators in virtually all areas of the plant to automatically control the filtration and backwashing sequence of operations. The actuators are connected to refurbished PLCs and linked to a new master MCC (Motor Control Centre) that runs the plant, treating up to 40ml/day (megalitres a day) for consumers in the surrounding areas. IQT actuators also incorporate on-board data loggers where commissioning settings, historical operational data and valve operating torque profiles are stored.