ATOS hydraulic proportional  valves, analog or digital

Open or closed loop versions

Electrohydraulic proportional controls modulate hydraulic parameters according to the electronic reference signals.
They are the ideal interface between hydraulic and electronic systems and are used in open or in closed-loop controls
Type of Atos proportional execution
Atos valves may be spool type or cartridge execution and can be grouped in three different functional families:
• pressure control valves: relief valves and reducing valves regulate the hydraulic system pressure proportionally to the reference input signal;
• 4-way directional control valves: direct and modulate the flow to an actuator proportionally to the reference input signal. These valves can be used in open or closed loop control system to determine the direction, speed and acceleration of actuators;
• flow control valves: 2 or 3-way, pressure compensated, to modulate the flow independently to the user loads.
Proportional valves and drivers
Atos proportional valves are equipped with ZO and ZOR, efficient solenoids (30 W and 40 W) respectively designed for direct-acting valves of ISO 4401 size 06 and 10 and they are assembled in different options as follows:
  • A : without integral transducer, open loop;
  • AEB, AES : as A plus integral electronic driver, basic or full;
  • R : with integral pressure transducer;
  • REB, RES: as R plus integral electronic digital driver, basic or full;
  • T, L: with integral LVDT single/double position transducer, closed loop, featuring high static and dynamic performances;
  • TEB, TES, LEB, LES: as T, L plus integral electronic driver, basic or full;
In the new generation of digital proportionals, the electronic driver is integral to the valves and it is factory preset to ensure fine functionality plus valve-to-valve interchangeability and to simplify installation wiring and system set-up.
Why buying Atos proportional valves from Interfluid?
  • Interfluid is an official Atos master distributor
  • Technical support and high specialisation in Atos products of our engineers team
  • Promptness and professionalism of our staff
  • Wide stock of original ATOS proportional valves on stock
  • Urgent shipments in 24 hours

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The variable-speed pump drives for hydraulic applications

In electrohydraulics, digital electronics gives important advantages:
• better performances of electrohydraulic components: hysteresis, response time, linearity
• numerical software setting of hydraulic parameters (scale, bias, ramp, compensation of non-
linearities) for full repeteability and easy data storage
• diagnostic (fault, monitor) and computer assisted maintenance of machines and systems
• direct interfacing to fieldbus networks

Atos digital driver’s range:
• E-RI-AEB/AES basic and full version for valves without transducer
• E-RI-TEB/LEB basic version for valves with single/double LVDT transducer
• E-RI-TES/LES full version for valves with single/double LVDT transducer
• E-RI-REB/RES basic and full version for valves with integral pressure transducer
• E-RI-PES for pumps with alternated P/Q control

A large number of the functional parameters of the valve can be easily set trough the
communication interface, using the Atos E-SW programming software, as:
• the bias and scale
• the ramps, corresponding to the transition time from 0% to 100% of the valve’s regulation
• the linearization of the hydraulic regulation
• dither frequency
Atos digital proportional valves are available with 4 optional communication interfaces:
• basic NP and PS: USB or serial programming RS232 interface.
The main feature of this basic version is the full interchangeability with the corresponding analog executions, in fact the reference and the monitor signals are analog, whereas the USB/serial interface allows to manage the diagnostics and to set the best configuration of the valve for the application’s requirements
• option BC: CANopen
• option BP: Profibus DP
• option EH: EtherCAT
• option EW: POWERLINK
• option EI: EtherNet/IP

Proportional electrohydraulics provides the following advantages in comparison with the electromechanical systems;
  • intrinsic overload protection
  • automatic force adaption
  • fast operating response
  • self lubrification of the system
  • simple stepless variation in speed
  • energy storage capability
  • high power density
  • forces and torques
  • long service life
  • high reliability