Linear Electric actuators with fail-safe -funtion Type ELR2.1, ELR2.2, ELR2.3

DESCRIPTION

Electric linear actuators ELR series for modulating and open-close duty of control and process technology to operate control valves.

The self-locking stem/stem nut is driven by an electric motor via a gearing. Load and limit switches define the stops for the end positions.

In case of power failure, the electric linear actuator runs spring driven into the respective fail-safe position (thrust rod either extended or retracted). In modulating duty, the end position seating is made via limit switches

MAIN FEATURES

- Electric manual operation with OPEN/CLOSE buttons.

- Mounting to valve made via yoke or mounting flange DIN 3358. The design enables easy connection to all types of valves. Standard version is suitable for Adcatrol valves.

- Generating a defined closing force in the end position leads to constant tight shut-off of the valve.

- The actuators are in enclosure protection IP 54 and are designed for rugged industrial use.

- Stall proof synchronous motors (or brake motors for higher positioning forces) ensure the highest positioning accuracy.

- Mechanical stroke indication via anti-rotation bar.

- Exact, backlash-free measurement of actual valve stroke by direct coupling to the valve stem.

- Universally usable actuators due to control via 3-point-step controllers, analogue input signals (0…10 V, 0 (4)…20 mA).

- Easy supplement to actuator with optional devices due to modular design.

- Limit switches, easily adjustable, for stroke limitation or as signal for intermediate positions.

- Integrated, adjustable stroke setting to nominal stroke over the complete stroke range (without exchanging pinions, …).