Linear electric actuators with Fail-Safe Function ELR
The ELR series linear electric actuators are designed for operation of control valves in modulating and on/off services in process engineering and industrial applications. The self-locking stem nut is driven by an electric motor via a gearing.
Load-dependent switches and/or mechanical limit switches define the stops for the end positions.
In case of power failure, the electric linear actuator runs into the respective fail-safe position by spring force (thrust rod either extended or retracted).
In modulating duty, the end position seating is made via mechanical limit switches.
- Modular retrofittable design.
- 24 V AC, 115 V AC, 230 V AC, 400 V AC 50/60 Hz and 24 V DC supply voltages.
- Electric manual operation with OPEN/CLOSE buttons.
- IP 54 protection.
- Valve protection against excessive force due to load-dependent seating.
- Mounting to valves made via yoke or mounting flange DIN 3358, enabling easy connection to all types of valves. Standard version is suitable for ADCATrol valves.
- Defined closing force in the end positions leading to tight valve shut-off.
- Stall proof synchronous motors (or brake motors for higher positioning forces) ensure 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 to 10 V, 0(4) to 20 mA), or fieldbus systems.
- Limit switches are easily adjustable for stroke limitation or as signal for intermediate positions.
- Electronic positioner.
- Additional limit switches.
- Potentiometers e.g. for 3-point-step control in closed loop.
- 0(4) to 20 mA electronic position feedback units.
- Heating resistor.
- Special coatings and finishes for aggressive environments.
- Actuation of ADCATrol control valves, or others on request.
- ELR2.1, ELR2.2 and ELR2.3.