Siemens Refrigerant valves MVS661.25-6.3N for ammonia (R717) and safety refrigerants FEATURES One valve type for expansion, hot-gas and suction throttle applications Hermetically sealed Selectable standard interface DC 0/2...10 V or DC 0/4...20 mA High resolution and control accuracy Precise positioning control and position feedback signal Short positioning time (< 1 second) Closed when deenergized Robust and maintenance-free DN 25 with kvs values from 0.10 to 6.3 m³/h Download PDF Now