The Siemens SQS65 actuator works from a 24Vac supply and needs a DC 0...10 V, DC 2...10 V or 0...1000 ? control signal, 3-position electro-motoric valve actuator non spring return - 5.5mm stroke, 35 seconds, 400N. The Siemens SQS65 actuators is a lift and lay actuators which is generally installed on Siemens 2 port & 3 port valves.