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Coal extraction application demonstrates the advantages of electro-hydraulic valve actuation


ount T orley Warkworth (MTW), an integrated operation of two adjacent open cast mines in the Hunter Valley region of New

South Wales, Australia, supplies international and domestic markets with semi-soft coking coal and thermal coal. Rotork actuators control the fl ow of water

from a two gigalitre (two million tonnes) dam source to the north and south coal processing (washing) plants. T e project includes an actuator on a pipeline supplying water to a new Water Cart Fill Point for routine dust suppression operations. Each water cart fi ll requires 120 tonnes of water to be delivered at a pressure high enough to overcome a 10m head. T e Water Cart Fill Point requirement was

very demanding, requiring an electric failsafe actuator to operate the isolation valve by solar power (i.e. 24 VDC), to be SIL-rated, and capable of closing a 500mm butterfl y valve in 10 seconds. Rotork was able to satisfy this specifi cation with a standard Skilmatic electro- hydraulic actuator.

Flexibility built in Skilmatic self-contained electrically powered actuators – comprising integrated control module, hydraulic manifold and a power unit consisting of a motor, hydraulic pump and reservoir — off er fl exibility and customisation to suit specifi c applications. Utilising an integral spring mechanism to provide the most reliable means of positioning valves to a pre-determined safe position, they have been specifi cally designed for use in critical fail-safe applications. T ey combine the simplicity of electrical operation with the precision of hydraulic control and the reliability of mechanical fail- safe action. With the intelligent control and



monitoring systems, the actuators provide an ideal solution for two position, safety shutdown or precise modulating control applications. T e Skilmatic actuator combines absolute reliability with performance monitoring and

data logging, including valve torque/thrust signature and profi le and status and monitoring diagnostics. T e actuator can be confi gured using Rotork’s non-intrusive Bluetooth Setting Tool, and datalogger fi les can be transferred from the fi eld to a standard PC for storage and analysis as part of asset management routines. Rotork Skilmatic actuators are certifi ed to

the following standards: ATEX, INMETRO, IEC, FM, CSA and GOST. T e double-sealed electric enclosure is watertight and dustproof in ratings up to IP68. Specifi able for three-phase, single-phase or DC electrical power supplies, the Skilmatic range delivers rotary torque or linear thrust outputs that are suitable for valves of virtually any size and design. ●

Sarah Kellett is with Rotork.

The Rotork Skilmatic electro-hydraulic valve actuator installation at Mount Thorley Warkworth. Solar panels seen in the background provide the renewable energy source to operate the actuator

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