Description

Dabeb Elram Electro-Hydraulic Actuator


The sketch above shows a sectional view of a typical Dabeb Elram Electro-Hydraulic Actuator. As can be seen, the main components are all housed within a fully sealed casing, which also serves as the fluid reservoir.

Extend and retract control is achieved by bi-directional operation of the electric motor, which means less control wiring. The absence of interconnecting pipework associated with conventional power packs reduces the possibility of leaks and makes for simple installation.

Solenoid operated versions are available for applications requiring high frequency or modulating duty.

Basic Operation

The ‘DEA’ Range (previously ZBG) of Elram Electro-Hydraulic Actuators operate on a simple ‘Bi-directional motor’ principal.

As viewed from the motor fan cover end, clockwise rotation of the motor causes the actuator to extend, and anti-clockise rotation causes it to retract. when the motor is not running the actuator is stationary.

The actuator may be stopped in any position by switching off the motor.

Various hydraulic circuit configurations are available, and can be configured for ‘locked’ or ‘free to move’ conditions when the motor is running.

Limit Switches

Standard actuators are NOT fitted with ‘on-board’ limit switches.

Due to the inherent nature of hydraulic systems, the Actuator will not be damaged by stalling, or reaching the end of it’s mechanical stroke. HOWEVER it is vital that the motor be switched off when this occurs to prevent overheating. This can be achieved by using one of the following methods.

  1. Limit / proximity switches fitted to the ‘load’ being moved by the Actuator.
  2. Integral Limit Switches, available as an option. End of stroke only – Non Adjustable).
  3. Timers.
  4. Operator Intervention.