Case

Central Highlands Water invests in AVK/Glenfield cone valve

Central Highlands Water is a regional water corporation providing high quality drinking water, sewerage, trade waste and recycled water services to customers in Ballarat and surrounding towns

Formerly known as the Central Highlands region water authority, it is one of 19 state-owned water businesses operating under the guidance of the Victorian Water Act.

The initial inquiry for the White Swan Reservoir project commenced mid-year of 2015 when consultants from MWH Australia through the support from Louise Loughnan, Lead Engineer at MWH Global, first inquired about a DN600 discharge valve suitable for a new scour pipeline operating at 3.50 cumecs and velocity of 7.91m/s.

The contract for supply of the valve was received in December 2015. The valve was manufactured by AVK Anhui and supplied by Glenfield Valves who also supplied the technical data including the plume throw that could be expected from the valve if discharge was initiated to the atmosphere. Based on this information and the requirement to protect the surrounding creek bed environment, it was decided to construct a concrete chamber to control the outflow.

 

The Glenfield Series 857 Cone Valve is manufactured from a Ductile Iron body with 316 SS sleeve and operated via twin screws and driven by an electric actuator. Unlike fabricated alternatives the Ductile Iron body incorporates an uneven number of ribs that are specially shaped to aid flow and reduce head loss and assures harmonic balance and vibration free operation over full valve travel.

The valve was delivered to CHW Project Manager Rohan Allen in July 2016 but due to weather conditions the valve was unavailable for site testing until early 2017. At the first operation, the result showed water exiting the valve chamber with the valve opened at 10 % with unusually brown water particles being scoured from the new installation.

All parties attended this successful operational test including experts from AVK Valves, David Crawford, Business Development Manager VIC & TAS and Geoff Trowbridge, Business Development Manager Dams, Reservoirs & Hydropower.

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