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the pressure below the diaphragms is built up again and the microswitch changes to its original position
Dungs MVD Dimensions
although not all sizes support all voltage options
Direct Replacement for Obsolete Models
These valves are high pressure
Siemens SQM40.155R11 Servo Motor | Actuator VGG the pressure below the diaphragmsThe SQM40. 155R11 is a reliable spring return damper actuator designed for HVAC systems requiring fail safe operation. It features a 10mm servo shaft diameter and operates with a counterclockwise rotation. With a servo torque of 5 Nm and a run time of 15 seconds to 90 degrees, this actuator provides accurate positioning. It operates at 120V AC and includes 1 auxiliary switch for enhanced control options. The actuator is housed in a NEMA 4 enclosure,