The rotary electric actuators of the VALMA ELA series are designed to control regulating or shut-off ball valves, butterfly valves and other actuators that require a 90° rotation of the working body.
The rotary electric drive consists of an electric motor with a gearbox, made in one housing together with a control board, limit switches and a visual indicator of the current position. Thanks to the use of a gearbox, it becomes possible to provide high torque on the output shaft while maintaining low power consumption of the drive, and the built-in limit switches ensure automatic shutdown of the electric motor when the drive reaches the extreme positions and allow you to monitor these states of the electric drive in the control system.
VALMA electric drives of the ELA series are available in two body versions: plastic (ELA-...-P) and metal (ELA-...-M).
Electric actuators with plastic housing (ELA-...-P) develop a torque of up to 30 Nm and are compatible with VALMA ball valves of the BAV series up to DN 25 (G 1") inclusive. Electric actuators with a metal body (ELA-...-M) develop a torque of up to 50 Nm and are compatible with VALMA ball valves of the BAV series up to DN 50 (G 2") inclusive.
Depending on the chosen connection scheme, the same VALMA electric actuator can be installed on both the rotary control valve and the shut-off valve.
If the electric drive is used as a control, a three-position control circuit (more/less/stop) must be used. This control scheme is usually supported by devices designed to control shut-off and control valves, such as the ELHART ECV series PID controllers.
If the electric drive is used as a shut-off device, the connection is made via an intermediate relay, and one contact is sufficient from the control system (for example, an "open" signal). This control scheme is supported by a large number of devices, for example, ELHART ECD series regulators in ON/OFF (two-position) control mode.
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