Belimo NVK24A-3-RE - actuator for globe valves with fail-safe function

Belimo NVK24A-3-RE – RetroFIT+ actuator for globe valves

Actuator for 2- and 3-way globe valves. During normal operation, the built-in capacitors store energy; if the power supply fails, the actuator moves the valve to the selected fail-safe position. This position is set using the POP dial as stem retracted or extended.

Key features and specifications

• Actuator force: 1000 N; control: 3-point.
• Rated voltage: AC 24 V; frequency: 50/60 Hz; voltage range: AC 19.2...28.8 V.
• Stroke: 20 mm; motor running time: 150 s / 20 mm; fail-safe function operating time: 35 s / 20 mm.
• Bridging time (PF): 2 s.
• Power consumption during operation: 3 W; at rest: 1.5 W; for cable sizing: 6 VA.
• Power and control connection: 4 mm² terminals (cable ø4...10 mm).
• Manual adjustment by push-button; mechanical position indicator for 5...20 mm stroke.
• Degree of protection IEC/EN: IP54; protection class IEC/EN: III, Safety Extra-Low Voltage (SELV).

The RetroFIT+ series is designed for installation on valves from various manufacturers using a bracket and universal valve neck and stem adapters. The capacitors are discharged on delivery; an initial charging time of approximately 20 s is required before first start-up.