AUMA showcase new actuator for underwater use

The AUMA SA multi-turn actuator for continuous underwater use opens new applications for electric actuators: for water supply, in hydropower plants, in civil engineering constructions for water applications, and for specific underwater applications. Where both water supply and sewer pipes are underground, actuators and valves are often installed in pits below ground level. Where high water levels are a permanent risk, actuators designed for underwater use will operate reliably even if flooding persists.


A universal sealing system combined with comprehensive corrosion protection qualifies these actuators for underwater use. Double-sealed cable glands at the electrical connection, inner seals – some in pairs – on all housing covers, and a one-piece solid shaft prevent the ingress of water.


“Our electric actuators are not only easy to install – they just require power supply and a signal cable – but also characterised by low operating costs and are virtually maintenance-free,” explains Peter Malus, Product Manager at AUMA. “They are also environmentally friendly, as no oil is used that might leak and contaminate the water. This turns them into a real alternative to hydraulics.”


SA and SAR actuator types, as well as the new variable-speed SAV and SARV versions, are available for continuous underwater use in sizes 07.2 to 16.2. As standard, the actuators are qualified for up to 15 m head of water, with higher heads of water are available on request.


All actuator settings including end position setting for travel and torque are non-intrusive via the AC actuator controls, with no need to open the actuator housing. The actuator controls are installed outside the flooded area, separate from the valve and actuator. Cable lengths up to 100 m can be achieved.