Belimo Actuator for Globe Valve 3-Point Fail-Safe 20mm Stroke 100-240VAC 1000N IP54 150s NVK230A-3

This Belimo linear electrical actuator is designed for controlling globe valves. The stroke length is 20 mm. The actuator delivers a force of 1000 N and can open/close the valve in 150 seconds. This actuator requires a supply voltage of 100-240 V AC and has a visual positioning indicator to clearly see the valve position. The actuator features three-point (open-close) control. The actuator simultaneously positions the valve as the integrated capacitors are charged. In case of a power supply interruption, the valve automatically returns to the open/close position using stored electrical energy. The actuator has a durable plastic housing and has an IP54 protection rating. This actuator can operate within ambient temperatures between 0 and 50 °C (32 and 122 °F). The actuator comes with a 1-meter power cable.

The actuator is equipped with overload protection, the actuator doesn't need limit switches and will stop automatically when the end stop is reached. Manual override is possible with a push-button, which disengages the gear train for as long as the button is pressed or locked. The stroke can be adjusted using a 4mm hexagon socket screw key inserted at the actuator's top, with the stroke shaft extending when turned clockwise. The actuator can be directly mounted on the globe valve using form-fit hollow clamping jaws and it can be rotated 360° on the valve neck. The actuator moves the valve to the desired operating position simultaneously as the integrated capacitors charge. If the power supply is interrupted, the valve shifts to the chosen fail-safe position using the stored electrical energy. The default factory setting retracts the actuator stem. The capacitor actuators require a pre-charging period to bring the capacitors to a usable voltage level. This ensures that, in case of a power failure, the actuator can move from its current position into the fail-safe position at any time. The rotary knob fail-safe position allows for adjustment of the preferred fail-safe position. The adjustment range is based on the actuator's maximum stroke height. In case of power failure, the actuator moves to the chosen fail-safe position considering a factory set bridging time of 2 seconds. Post-factory delivery, the actuator is fully discharged and requires about 20 seconds of pre-charging before initial setup to attain the necessary voltage level in the capacitors.

Pros:

• The actuator is equipped with a fail-safe feature
• Manual override
• The actuator is overload protected
• Visual position indicator

Cons:

• The time to open/close of 150 s is slow for some applications