Oura pumping station near Cootamundra in New South Wales, Australia, uses Sipos 5 actuators for water hammer prevention. Rapidly closing or opening a valve causes pressure transients in pipelines, known as water hammer. Valve closure can result in pressures well over the steady state values. Water hammer has been known to pull pipe supports from their mounts, rupture piping, and cause pipe-whip. The Oura pumping station stars three pumps which are equipped with Sipos 5 actuators on the 12” pump discharge butterfly valves. At any one time there are two pumps working and pumping water to the holding tank. The 3rd pump is used for back-up. The Sipos 5 actuators allow programming of a so called “speed-curve”. This means that up to 10 portions of the complete valve stroke can be assigned a different speed, resulting in different positioning times for the stroke portions. Especially in the closing section of the valves slow operation is paramount to avoid the water hammer effect. The initial commissioning of the system alone has already reduced the water hammer by more than 30% with room for optimisation.