Big valves use electrohydraulic control

March 6, 2013

Mount Thorley Warkworth (MTW) is an integrated operation of two adjacent open cast mines in the Hunter Valley region of New South Wales, Australia. It supplies international and domestic markets with semi-soft coking coal and thermal coal.

Rotork plc, Bath, England, has supplied valve actuators for the pipework delivering water to the north and south coal processing (washing) plants from a new 2 Gl dam source. This project has included 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 ton of water, delivered at a pressure high enough to overcome a 10-m rise in the height of the pipework at the point of delivery.

Hydraulicspneumatics Com Sites Hydraulicspneumatics com Files Uploads 2013 03 Rotork Valve Actuator 0

The Rotork Skilmatic Pro electrohydraulic valve actuator installed on the Water Cart Fill Point. Solar panels seen in the background provide the renewable energy source to operate the actuator.

The specification for the actuator to operate the isolation valve on the water cart fill point called for a solar powered, 24 Vdc SIL-rated electric fail-safe actuator, capable of closing a 500-mm butterfly valve in 10 sec. Rotork has been able to satisfy all requirements with a standard Skilmatic Pro electrohydraulic valve actuator.

These self-contained electrically powered actuators are comprised of an integrated control module, hydraulic manifold, and a hydraulic power unit (HPU) consisting of a motor, hydraulic pump and reservoir; and are flexible enough to serve specific applications. The HPU is powered electrically, and an electrical input signal commands the hydraulics to pivot the valve to a control position. An integral spring mechanism moves the valve to a pre-determined safe position in the event of power loss.

The recent incorporation of an intelligent control and monitoring system makes the actuators an ideal solution for two position, safety shutdown or precise modulating control applications.

For more information, contact Rotork plc +44 (0) 1225 733200, email [email protected], or visit www.rotork.com.

Continue Reading

Handbook Simplifies Advanced Aspects of Mobile Hydraulic Controls

May 10, 2017

Author Brendan Casey lays out his hydraulics know-how that he acquired over 27 years in a simple handbook made for people that want to improve their skills in troubleshooting ...

How To Select Hydraulic Connectors For Leak-Free Reliability

June 14, 2016

Hydraulic oil leaks are often considered to be an inherent characteristic of hydraulic machines. While this may have been true 30 years ago, advances in sealing technology and...