Electro-hydraulic valve actuation
2 April 2013
Situated in the Hunter Valley region of New South Wales, Australia, Mount Thorley Warkworth (MTW) is an integrated operation of two adjacent open cast mines supplying semi-soft coking coal and thermal coal to international and domestic markets.
Rotork has supplied valve actuators for the pipework delivering water to the north and south coal processing (washing) plants from a new 2GL dam source. The project includes an actuator for a pipeline supplying water to a new Water Cart Fill Point for routine dust suppression operations. Each water cart fill is made up of 120 tonnes of water, delivered at a pressure high enough to overcome a 10m rise in the height of the pipework at the point of delivery. As the actuator used to operate the isolation valve on the Water Cart Fill Point needed to be a solar powered, 24VDC SIL-rated electric fail safe actuator, capable of closing a 500 mm butterfly valve in 10 seconds, Rotork supplied the Skilmatic Pro electro-hydraulic product solution.
The actuators comprise an integrated control module, hydraulic manifold and a power unit consisting of a motor, hydraulic pump and reservoir. An integral spring mechanism is used to provide the most reliable means of positioning valves to a pre-determined safe position.
According to the company, the Skilmatic Pro actuators combine the simplicity of electrical operation with the precision of hydraulic control and the reliability of mechanical fail-safe action. A new intelligent control and monitoring system means the actuators provide a solution for two position, safety shutdown or precise modulating control applications.
Rotork Fluid Systems
T: 01225 733200 www.rotork.com