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Intelligent electric valve actuators from Rotork have been installed at a new water treatment plant at Cwellyn, Wales, to control flow through a new extension to the works.

Welsh Water is investing GBP200m to upgrade its water treatment works across the country by 2015.

This includes the water treatment plant at Cwellyn, which has been designed and built by Black and Veatch, one of Welsh Water’s Asset Management Alliance partners for water-supply capital investment schemes.

The new treatment regime is designed to clarify the water before it enters the existing works in order to deal with changing raw water conditions and to consistently meet all water-quality standards.

Rotork IQT direct-drive quarter-turn electric actuators have been installed to operate butterfly valves controlling the flow of water throughout the new treatment plant.

All the Rotork IQT actuators are Profibus DP enabled and are linked to an existing distributed control system (DCS) on five two-wire bus networks.

The operation of the plant is supervised by a Scada system designed by Oasis Engineering.

Water from Llyn Cwellyn, some 2km away, gravitates to the new treatment plant at a rate of up to 850m3 per hour.

The flow initially passes through inlet static mixers where coagulant is dosed to maximise the performance of the dissolved air flotation (DAF) process.

The flow is divided into three identical DAF streams, which consist of one Flocculator followed by one DAF cell, where particles in suspension are floated to the surface to form a sludge blanket.

The clarified water is then filtered through first-stage rapid gravity filtration (RGF) before being pumped to the existing treatment works through ultraviolet disinfection to deactivate cryptosporidium.

The Rotork IQT actuators, including some modulating units, control all valve operations, including the inlet works flow control, the automatic de-sludging of the DAF cells, the automatic backwashing of the RGF plant and the plant treating the effluent created by the clarification and filtration processes.

The completion of the upgrade project at Cwellyn will safeguard the drinking water quality for 70,000 Dwr Cymru Welsh Water customers in the Caernarfon area.

Rotork is the world’s leading designer and manufacturer of actuators for isolating, regulating and modulating valve duties, valve control systems, valve gearboxes and accessories, serving the international oil and gas, power generation, water and effluent treatment, processing and environmental industries. Capabilities encompass actuators and control systems for new plants, plant extensions and upgrades. Rotork’s global network of more than 350 offices and representatives provides a localised single source for these products, supported by life-of-plant maintenance, repair and upgrade services.

Rotork Controls

  • Market-leading intelligent electric actuator technologies offer a solution to applications of virtually every description, size and complexity, in any environment

Rotork Fluid Systems

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  • Provides an unrivalled service for valve gearboxes and accessories, completing Rotork’s status as the ‘one-stop shop’ for valve actuation and control equipment

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  • Offers expertise for the installation and commissioning of retrofitted valve actuators and control systems for plant upgrades and extensions
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